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Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #668701
09/24/16 7:07 am
09/24/16 7:07 am
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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gavin eisler  Offline OP
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argyll. scotland, uk
There is one extra screw in the outer cover of the 71,everything about the 71 cases suggests strength compared to earlier cases. The kick start lever is the the same as 71 Triumph twins as far as I can see, this should make sourcing a new one a lot easier. Probably trying to simplify the spares stocks.I have a few 1970 parts lying around , other bits of the gear selector, the "grannies tooth " that engages in the return spring is much chunkier on the 71 compared to the 70.
I reckon that if the company hadnt gone bust the A65 would have seen a few more interesting developments, on paper it is way ahead of both the Triumph ( no push rod tubes ) and the Norton ( solid unit construction , with the camshaft where it gets crank splash) before it finally expired. There are extra unused bosses cast into the rocker cover suggesting more was to come, the timing chest looks like it was meant to take an end feed oil seal, just beaten by the bean counters, the draughtsmen had it planned, the foundries had it cast, shame.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
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Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #668702
09/24/16 8:44 am
09/24/16 8:44 am
Joined: Apr 2005
Posts: 1,633
Mississauga, Ontario.
A
Adam M. Offline
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Wonder if you have a picture of your inner timing cover to show it ?

Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #668772
09/24/16 8:22 pm
09/24/16 8:22 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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Theres not much to see Adam, coaxial with the crank the in side of the timing chest has a round recess which is cast in, this is what gets machined out to take the end feed oil seal, the Devimead mod was to add / weld an oil gallery to mate up with this. Les Mason who formed Devimead originally worked in the BSA comp shop, maybe he would know, it could just be that this recess was needed to clear the worm gear locknut but to me it looks like a bit of forward planning. A very minor adjustment to the pattern to add the oil gallery would have been all that was needed to complete this.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #668914
09/25/16 6:47 pm
09/25/16 6:47 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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argyll. scotland, uk
Got on with it a bit today.

Head and tools.


The white tape marks 12 " tape to wrench centre, setting the ratchet 1 click towards acute from 90 degrees makes the tape to spanner head 12".

This is flawed logic see the following helpful post by TR6 Ray.


Its not cock on, but its pretty close, better than using 90.




Sketch of head clearance to piston rim, valve cleearance, rocker arm pad removal.


The valve sits a good bit deeper, so much so that I have ground 0.070" off the RHS rocker to get the push rod to fit, there wwere generous blobs of stellite there so useful weight loss, ground through quite a nasty void on the way, it cleaned out. The pad ends were pretty cobby anyway so Ive removed a bit from the sides that was just along for the ride.


Ground DS rocker on left. will polish these faces when certain of set up, I may take a bit more off, it fits just with the adjuster backed right up, so there is scope for a bit more if needed.
.

Took two hours using a dremel , 10 mm orange stone for bulk, then 8 mm orange stone to correct the radius, used blue to check level, only about 15 iterations.
Timing side still to do.

The valve was only fitted with the outer to test, definetely spins now, hurray, loads of clearance, o.125 at valve, 0.060 at OD of dome tightest.

Will probably stick with this. maybe, maybe not , loosing a further 1mm 0.040 " ish with a thinner head gasket will bring this down to 0.020 min clearance/ squish, is that enough, opinions welcome? Means more rocker pad grinding if I do go for more comp.

Still to check valve geometry at mid lift, I had shortened the previously fitted Alloy / steel capped rods to make this work before, the inlet pads were OTT any way, when I ground them down to the point they would fit with the push rod in place and allow me to pass the spindle through the blue showed rpad to stem tip on the edge of the tip, the radius was corrected to move this towards the centre a bit, I want to stay 0.020 min away from the tip OD, doesnt have to be dead centre since it slides forward in motion. Footery work..

Got a good tool chest from Aldis a month ago, , BSA stuff in top drawer, it ate everything else, now have 3 empty boxes and box of also rans that never get used. bench top now a bit clearer.

Last edited by gavin eisler; 09/26/16 5:17 am.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #668917
09/25/16 7:20 pm
09/25/16 7:20 pm
Joined: May 2010
Posts: 2,573
Illinois, USA
TR6Ray Offline

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Illinois, USA

Nope -- this is wrong:

Originally Posted By gavin eisler
The white tape marks 12 " tape to wrench centre, setting the ratchet 1 click towards acute from 90 degrees makes the tape to spanner head 12".


Its not cock on, but its pretty close, better than using 90.





________________________________________________________

Sorry Gavin, but you are wrong about that. What you are doing will give you the incorrect torque.

Torque is the product of the applied force (the push or pull delivered by you to the handle of the wrench), multiplied times the length of the moment arm. The moment arm is the perpendicular distance between the line of force and the center of rotation. If you had the extension at 90 to the body of the wrench, and your arm also at 90 to the body of the wrench, the perpendicular distance from the extended centerline of your arm to the center of rotation (the head bolt) will be the same distance as if you were not using the extension at all.

You don't have to take my word for it, look at the diagram I copied for you from the Snap-On website. The second figure is the one that applies if you don't want to do mathematical calculations to figure out the modified setting for your wrench:



'64 TR6R Plus some Twins from other countries (U.S., Germany, Japan)
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #668955
09/26/16 5:11 am
09/26/16 5:11 am
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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Thanks for that Ray, luckily I didnt go to full figures, stopped at 20lbft, was messing around prior to head fitting, nice explanation.
Will leave my mistake in for others education.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #668967
09/26/16 7:58 am
09/26/16 7:58 am
Joined: May 2010
Posts: 2,573
Illinois, USA
TR6Ray Offline

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You are welcome, gavin. Actually, in the scenario above, you would have shortened the moment arm very slightly by the position of the adapter. That would have resulted in a very slightly reduced torque. If you were going for 20 pound feet, you would have actually gotten

(20 pound feet x cosine15)= 19.3 pound feet

It wouldn't have mattered in the grand scheme of things. I just wanted to save you some unnecessary trouble in setting up your wrench in the future.

The bike is going to be awesome. Can't wait to hear about the on-road results of this latest go-around.

Ray


'64 TR6R Plus some Twins from other countries (U.S., Germany, Japan)
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669047
09/26/16 5:47 pm
09/26/16 5:47 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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Cheers Ray, its getting close, John has a new thinner gasket, so until i get these i am refining a few odds and ends. Trimmed the torque wrench adapter to clear more of the rocker box and make life easier.
Got all the valves fitted to the head, will take a full set of clearances at 2 mm gasket once the TS rocker is ground to size, nearly there.

Rockers in progress.Got over enthusiastic with the red enamel.

LHS rocker inprogress needs more off the inside of the pad, took the bulk off with the big grinder , much quicker 10 mins.


New tool roll along chest contents.

Top drawer BSA stuff

1/2 of a halfords pro set

Brutal stuff


Scrapers and metrology bits

Hitting things and the cordless dremel.

Other 1/2 of socket set

Bottom drawer big stuff and odds and ends.

Bike and box

MZ 250 fork gaiter , fitted a treat, decent rubber too.


Got a wee oil leak somewhere around the OPRV, needs fixing.

Same as before but shinier, matching clocks would be good, the grey face speedo needs a rebuild.


Other drawers

Last edited by gavin eisler; 09/27/16 6:19 am.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669323
09/28/16 6:50 pm
09/28/16 6:50 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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argyll. scotland, uk
More work on the rockers.

Grinding pad.


Valve open.



Valve closed.


Wipe mark on rocker pad.


Initial pad contact, no spindle spacers, rocker moved side to side for start point.


Full stroke wipe mark.


A day later, onto the RHS.


1st iteration wipe mark LHS, not very centred.


The magnet on a stick saves the spindle spacer falling when the spindle is withdrawn.


Rocker pad side view, profile now very different from start condition, almost finished. Note gap between arm and valve spring retainer, a bare mm.


Wipe mark more centred, it took hours of slowly slowly catchee monkey to get this corrected.


Final clearance checks,

A light touch near the valve pocket rim, plenty of room.


The closest point round the piston Dome OD.



Final head assembly next week, off to look at a potential lathe Myford ML7, meet up with John for moral support and lathe inspection.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669335
09/28/16 7:15 pm
09/28/16 7:15 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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argyll. scotland, uk
i did a quick internet trawl about rocker to valve contact, as long as the strike is at least 0.020" from the valve centre all is good, my crude grinding technique is very time consuming, keeping the pad flat in the same plane as the spindle is not easy!, the blue tells me which side is high/ low. Open to advice /criticism here, in an ideal world the rocker pad radius should be the radius of the spindle centre to valve tip, some sort of jig to maintain this would be a good thing.
I have limited facilities and keep reminding myself that the other side which is stock has a point contact that varies with the the thackery washers, so is absolute dead centre a must have or is perfect the enemy of "good enough"?. I tick the 0.020 " min from valve tip edge box , and the wipe is as short as I can get it. One other niggle is that the weld I am grinding away at is hard enough, when grinding it produces no sparks, it is F hard and has eaten away the orange stone , unlike the rocker arm material which produces small yellow sparks, not being familiar with stellite I am not sure if I have gone through the previous hard layer or if it was all stellite, what say you. If I have gone through it , these labour intensive items will have a short life span!.
i have spare stock rockers if it all goes wrong.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669351
09/28/16 8:49 pm
09/28/16 8:49 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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argyll. scotland, uk
Its too late for go easy , if there was stellite it went about 70 thou ago, what are the options, go further in and rebuild with stellite, case harden/ I have some old toe nail clippings and a source of heat?


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669398
09/29/16 3:54 am
09/29/16 3:54 am
Joined: Apr 2005
Posts: 2,380
Bega NSW Australia
Mark Parker Offline
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Bega NSW Australia
I used to have hardfacing metal sprayed onto cut down valves, that worked alright. Though I now just fit lash caps. It may be worth trying the std rockers to see how they fit? I use mushroom adjusters which are good, but either way the geometry needs to be good, with the adjuster wound down a bit. A mushroom head needs a little room.


mark
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669430
09/29/16 9:50 am
09/29/16 9:50 am
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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Thanks gents,
"They may just have been built up with hard weld not stellite, the guy who used to do my race cams built them up with what he called 'cold weld' and ground them back down to the form, that way i didn't have to pay for a 'blank' every time."

I think this is what I have been grinding through. It is weirdly sparkless when grinding, looks a bit like the "dissimilar" SS type welds that allow ferrous to SS welding.
On the plus side I have shed a few grammes from the important end area and the pad surfaces no longer have pits .
They are staying in for now, time will tell if they wear or not, if they do, I will grind more and have them faced. I reckon they will be fine judging by the hardness when grinding.

I have to fight the push rods in even with the adjuster backed full out (( it was like that before anyway), and if I go to the thinner gasket option I still need to lose another 40 thou off the pads, getting close to the valve spring top keeper.
Must get real numbers for this, By eye, its still over a mm and as the angles change and with it being half the distance from the centre of rotation this doesnt close up as much as the pad moves down when grinding.
The thin 1mm gasket option will bring my Piston to head clearance down to around 0.020" at the tightest spot round the dome OD , is that enough?
Will probably build it with the 2 mm gasket for now and try the 1 mm one for a caper next year.

Mark , I considered shortening the valves, there isnt much to play with, how thick approx are the lash caps? How far do they overlap the stem.
The distance from valve tip to valve collet top is 0.173", 4.4 mm.
Losing a mm or so here might help a lot.
The more I ponder this the more shortening the valve makes sense, hmmm, off to look for lash caps.

Last edited by gavin eisler; 09/29/16 10:04 am.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669434
09/29/16 10:35 am
09/29/16 10:35 am
Joined: Dec 2004
Posts: 9,230
Scotland
kommando Online content
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Look for VW 8mm lash caps = 0.315 dia vs 0.3125 and cheaper due to increased volumes.

Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669454
09/29/16 2:05 pm
09/29/16 2:05 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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Cheers John, useful tip, haha.
More measuring, beginning to enjoy this,I had a couple of teeth out last week and wasnt really top form,using the dremel kept reminding me of the dentist, but now the pain subsides and I can think straight.

Clearance of rocker arm to spring collar, 0.028" with feelers.

Angles look good, mid valve stroke is 90 degrees, close enough for country work anyway, pleased with this.



Stuck the rule to the frame with a NIB magnets, the rule is parallel to the v/v axis , referenced off the top collar, it help with the angle visualisation and shows me roughly mid stroke, the clock gauge is too pernickity for this.


The camera lense and parallax are messing with this, they were parallel , honest. Mid stroke, 90 ish.


Valve closed.



Valve open.


mid stroke better angle.
.

Theres still the matter of valve spring fitted length, but otherwise, lookin good, as my old journeyman used to say, i am "the man that ate the biled ham , raw", quite pleased.
off lathe hunting soon, a potential Myford ML7 is in the offing.

Last edited by gavin eisler; 09/29/16 2:13 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669467
09/29/16 3:21 pm
09/29/16 3:21 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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The way it is the angles are pretty good, the measurements are crude but the arm gets to 90 degrees around mid stroke, theres still scope for a little more to come off the pads, enough to ease fitting.

Limiting factor is the 0.028" at the arm to valve collar (these alloy collars are possibly thicker than the steel ones, must check), leaving a safe 0.010" minimum clearance would allow this to come in another 18 thou, which translates to roughly 36 thou at the valve tip.
If the pads wear , valve stretches or seats recede this clearance will close,hmmm. Better leave it alone. Will polish off at this. This pretty much rules out the thinner head gasket, with these rockers anyway, Will dig out some stock inlet rockers for comparison.
Must check installed spring heights.

Last edited by gavin eisler; 09/29/16 3:27 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669493
09/29/16 6:47 pm
09/29/16 6:47 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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Thanks again Nick, will leave things the way they are, the spanner tip is a good one, its almost ready to box up. not done with polishing yet, got distracted, I have been scheming and sketching, I have a cunning plan,. A 6mm drill sits neatly between the rocker fins.
Inspired by your oil to the head mod, heres the plan, 2 off 6 mm OD pipes set into the gap between fins 2 and 3 with JB weld on the rocker amplifier, drill from inside cover to Pipe , 2 jets per valve one at tappet, one at guide , diametrically opposite the valve drains. Jet sizes will start small, dont want to flood the head too much. Possibly smaller jets at the inlets, than the exhausts.
The rocker cover will have two 6 mm stubs out the front to pick up a small cooler, fed from the OPRV dump line. To connect into this I will drill into the vertical face, tap for 8 mm and bring out a stub maybe in Cu so I can use a capillary elbow for the 90 , and forward and up to the wee cooler.maybe through another filter, I have a spare base knocking around somewhere. more oil volume is good, with two cannister filters it would gain a useful 3/4 of a pint.
Would be almost invisible ( not if I fit a filter) and pretty reversible, just some wee holes to fill .

Last edited by gavin eisler; 09/29/16 7:18 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669504
09/29/16 8:05 pm
09/29/16 8:05 pm
Joined: Dec 2013
Posts: 3,741
ohio, usa
kevin roberts Offline

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ohio, usa
gavin, this is the best thread on this forum.

if you'd clean your fingernails every now and then for the pitchers it would be flawless.


live every day.
die once.
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669529
09/30/16 1:57 am
09/30/16 1:57 am
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Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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"if you'd clean your fingernails every now and then for the pitchers it would be flawless.
_________________________"
Thanks for the compliment,my head is swelling to match my jaw.
Ha !, i had noticed as well, nails trimmed.
I should have done the oiling mod when the cases were bare, Doh! I have a spare OPRV, would be easy to mod this and solder up the hole that bleeds off to the dump gallery, drill the dome cap and take the oil line from there. Reversible too. Must get some 6 mm Cu pipe, off lathe hunting with J.Will report back tomorrow.
I see another potential side benefit, adding mass to the rocker amplifier may reduce the rattle.

Last edited by gavin eisler; 09/30/16 1:59 am.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669644
10/01/16 2:23 am
10/01/16 2:23 am
Joined: Jul 2012
Posts: 332
Forfar, Scotland
J
JER.Hill Offline
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Forfar, Scotland
Gavin

I have one of the old style OPRV's laying around, I'll dig it out and you can pick it up next week when your across to pick-up the lathe, might even have a grub screw for you, although I'll need to see what the size is, but I'll have a look at a set of empty cases.

John

Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669691
10/01/16 2:40 pm
10/01/16 2:40 pm
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Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
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Cheers for the pics Nick, correct me if Im wrong.
Do they show two OPRVs, the old ball, style and the later piston?


This looks doable.


Does this pic show transfer ports so the piston can allow oil to the dome chamber?


https://s3.amazonaws.com/hires-aviary-pr...8d1d185a03b.jpg

Whats the piece poking out the LHS, I am not familiar with the earlier OPRVS.?


Ball on seat ?


Soring on ball?


Part assembled, spring relaxed?


View from motor side, ball on seat in port?


Outer hex, showing spring seat with holes?

Tapped outer hex?


Whats the off centre washer hingmy lower RHS?



The new stud coupling is screwed into a drilled and tapped outer OPRV hex?


Handsome Bonnie ,


A wee camera tip , doing this thread has helped me learn a few dodges using a compact Canon G10 , when I take pics like this I set the camera to manual focus, set for 10cms for single items or 20 cms for a more general view, with the strap pulled tight round my neck I can sway back or forward to get a sharper focus. A tripod is better/.
|For closer still I put the bench magnifier over the subject then shoot through that,although the flash angle can cause glare, tilting magnifier around to a sweet spot.;
Pics of bare steel and alloy need the flash settings to be turned down to -1 or -1.5.
I still havent figure out how to turn down the rust amplifier setting, looking at the pics of the rear shocks , I hadnt realised what a state they were in. Looked passable in real life.

The lathe hunt went well. Reached a turning point hoho!
Now the pleased owner of a lightly used Myford ML7 with some useful stuff, stand, 4 and 3 jaw chucks, face plates,drill chuck , 1 set of change wheels, fitted with a clutch, tilting Z axis milling attachment, full set of German Carbide bits, never used, other chunky tool bits various shapes. Travelling steady, angle poise lamp. CP motor 1/3 HP, . With some nice old paper work, installation guide and accessory lists plus other odds and ends.
Noticeably absent, no tail stock centre,no foot mounting blocks to lift it off the suds tray, no coolant pump, wiring a bit incomplete , no E stop or other switches, it has a reversing switch on the stand, no measuring tools. Otherwise very complete, oily with light surface rusting, reasonable paint. The seller knew nothing , the previous owner had been a modeller judging by the price list he did some tooling up in 1983 , doesnt look like its been used for ages. Of course once I had spotted it on Gum tree , severa; other potential buyers surface, but the seller was decent and allowed me first viewing, it was about 150 miles away from home, but in a part of the world that I know quite well and conveniently close to where John lives, he came with for a knowledgeable eye, thanks JH. I was first caller, the early bird got the worm. Its going to need a bit of cleaning and wiring, and a space to use it in. Should be fun getting it up and running.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669745
10/02/16 3:25 am
10/02/16 3:25 am
Joined: Jul 2012
Posts: 332
Forfar, Scotland
J
JER.Hill Offline
BritBike Forum member
JER.Hill  Offline
BritBike Forum member
J
Joined: Jul 2012
Posts: 332
Forfar, Scotland
Hi Nick

Good informative photo's. I take it your running your OPRV line up to the Tee before the Tee into your return line. The Tee then feed the rocker supply with surplus going to the return, or in the case of the valve being on seat, this hook-up allows the normal return to feed the rocker supply. Looks a good modification to get a bit more oil cooling to the head.

I once did a similar end-feed system and used Airoquipe hose and fitting which kept it neat and tidy.

Sorry to hear your T120 is leaking and toolbox lid took off on its own.

John

Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669748
10/02/16 3:56 am
10/02/16 3:56 am
Joined: Apr 2005
Posts: 2,380
Bega NSW Australia
Mark Parker Offline
BritBike Forum member
Mark Parker  Offline
BritBike Forum member
Joined: Apr 2005
Posts: 2,380
Bega NSW Australia
Nice looking end feed block, that's a better system than welding. I like that you can check the seal by removing just the outer cover, feed pipe and that block. I could make one of those on the the little lath I bought. I've had seals fail a couple of times and simple replacement is always better than complicated.


mark
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669754
10/02/16 6:49 am
10/02/16 6:49 am
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
BritBike Forum member
gavin eisler  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
Great info, the wee hole in the rocker spindle centre boss is a much neater idea than my plumbers fantasy, thanks for sharing.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #669807
10/02/16 7:40 pm
10/02/16 7:40 pm
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
gavin eisler Offline OP
BritBike Forum member
gavin eisler  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,753
argyll. scotland, uk
Nick, did you do anything to the drains around the exhaust valve spring bases? John and I were chatting about this . J mentioned relieving the lower edge of the drain a bit so there is less of a puddle, certainly room for a bit of dressing as stock.
I have an oil leak at the OPRV as it sits, hasnt even run, so this needs investigation. I used Cu washers ,was thinner Al and paper before. Once the lathe is running the O ring mod will get done.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
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