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Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #693946
05/04/17 9:42 am
05/04/17 9:42 am
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
Hi Ed.
you said

" I am aware that if a bike runs better if you back off the throttle, the main jet is probably rich",

this is not right,If the bike runs better when the throttle is backed off , the MJ is too LEAN.

In an ideal world carb settings would be a perfect 12:1 across the range, a trip to a dyno and a few adjustments , hey presto carbs done.


In my world the dyno is a days journey away and the operators are used to FI or diaphragm carbs, so the the throttle gets banged WFO for the run, not much help with old Amals.

i agree , admitting a crude strangler at full throttle is a pretty coarse test, however I can only use whats available ,so thats all i can do.
My new settings were arrived at by a few iterations, not being keen on running a fresh built motor at full throttle to get the MJ first , I have needed more trials ( and errors!) than possibly needed.

First off it was obvious on the first run the slide was too weak, spitting immediately off idle, applying the choke fixed it, so i went one slide 1/2 number richer from 3.5 to 3. Sorted.

next 1/2 throttle runs, applying choke killed any pull, changed tone to lower, so too rich, down one NJ size, more better but still applying choke for test not better.
Next a weaker needle, instant improvement on pull, more choke shows still not too lean. Settle for needle in weakest position after road tests. This changed after getting the MJ size right.

Next MJ , 190s still too rich, for this I prefer not to use the choke but look for pick up when throttle is partially closed from WFO.Although the choke can be played with for science sake.
Arrive at 160 MJs using this test. Now 1/2 to 3/4 is a bit lean, raise needle one notch ( again choke tests gave a slight improvement in this range), presumably the over rich MJ were influencing the 1/2 - 3/4 range , with the correct MJs fitted this had gone too lean, Thats the current set up.
Without the choke tests the 1/2 throttle range would have been more difficult to get right.
This has all been a bit " seat of the pants" , luckily Amals have limited variables so the number of possible combinations gets narrowed down fast, unlike Mikunis which have a few more needle options to keep you busy.
Yes choke tests are crude, but short of an onboard air / fuel mix analyser its all a poorboy can do.
i tried plug chops, modern fuel and a miserly attitude to sawing up plugs meant I could tell very little from them.
last time I pulled the plugs they were not sooty and not overly white with the earth strap looking healthy , i cant be far off.

Disclaimer, these carb settings work with my bike, the ports work very differently from the stock holes, I have stock filters, cams and pipes, but bigger valves and pistons, do not be tempted to try these settings with stock ports, your stock A65 will run way too lean.





Last edited by gavin eisler; 05/04/17 9:52 am.

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] #694181
05/06/17 8:29 pm
05/06/17 8:29 pm
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
Its time to call an end to this thread , signing off with a 3 day adventure, perfect weather , great company and good whisky.

The West coast of Scotland is heaven on earth at this time of year.

Heres the bike in Ullapool , about 160 miles north of home, Deuchars finest ale in the pannier back pockets at the chip shop.
Soup and a haddock supper to refuel, The eagle eyed will note the lack of pillion footrest, missed that in the fasteners check and paid the price, the silencer clamp held out to the end , whew. The panniers are a bicycle set, but they did the job with some elastic rope for added security.

[Linked Image]

Too cold for ice cream at ten past eight.
[Linked Image]
Ullapool town clock.
[Linked Image]

berthing companions in Grants shed in Nedd, T150 with Hyde kit and all the goodies, with a Self abuser behind it.
[Linked Image]

Unpacking 195 miles later, destination acheived.
[Linked Image]

Quineag seen form the shed in Nedd. my breakfast view.
[Linked Image]

The Seas Rich Harvest, old capstan at Tarbert , Handa ferry terminal.
[Linked Image]

This man and this boat saved my sons life ,
[Linked Image]
one reason for the journey was to thank him, 3 years ago my son fell off a cliff on Handa Island, 45 foot drop onto boulders below the tide line. Roger was called out by the coastguard because he was closest and knew the waters, they heard Robbies shouts, got the boat close and raised him above the incoming tide, the life boat couldnt get in , they stabilised him before the chopper picked up and flew him to Stornaway on the isle of Lewis.
Where the excellent folks in the Hospital put together a shattered femur and stabilised broken Vertebrae, he made a full recovery.


View of Tarbert terminal and the waters to Handa. BSA showed a clean pair of heels to the Busa on the mostly 1,st and 2nd gear tracks.
[Linked Image]

Filling with the most expensive fuel on Mainland Scotland , in Scourie.£ 12. 70 for 9.5 litres, almost £6 a gallon.
[Linked Image]

More Sutherland peaks from Kyleskue
[Linked Image]
The BSA hillwatching , Quinag, as I rode over at Sunset, this had lit up like an OTT photoshopped Ayers rock, couldnt stop at the time though, this doesnt do it justice.
[Linked Image]
Me, bike , loch , hills looking North.
[Linked Image]
Good company.
[Linked Image]
[Linked Image]



Last edited by gavin eisler; 05/06/17 8:38 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] #694183
05/06/17 8:41 pm
05/06/17 8:41 pm
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
The road into Nedd is possibly the most challenging drive I have ever encountered, its fun, but you wont get out of 2nd more than once, and 1st is essential for the one in four hairpins, anything bigger than a van gets stuck on this road, as well as the grades there are herds of red deer, and crazy local fishfarmers who know it too well.
[Linked Image]
one of the infinite number of corners, with the old CR 4 speed i would have killed the clutch, very grateful to the new 5 speed cluster, low speeds easy, overtake more than one car drop two gears and cheerio. Its brilliant.

it never stops raining here dont go.
[Linked Image]

The policemen are eating Ice cream, so did I , roasting, the cops were good crack, the BSA is the best ambassador you can get, everyone is your friend.
[Linked Image]

Ruins of the Beauly priory.
[Linked Image]
Cool tree.
[Linked Image]

An epic wee adventure, bike ran great, marked its spot from the crank breather, otherwise flawless, hitting nearly 70 mpgs, cruising 4- 5 k, and eating up the road. About 500 miles in 3 days amongst the most incredible scenery in the World on a bike that makes every one like you , what a blast, thanks for watching, goodnight.


Last edited by gavin eisler; 11/28/17 7:02 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] #700770
07/04/17 9:44 pm
07/04/17 9:44 pm
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
Well the pics have gone, Photo Bucket have blocked 3rd party Linka , I may edit the thread and repost it in aa trimmer version, a job for Winter.


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] #700842
07/05/17 1:44 pm
07/05/17 1:44 pm
Joined: Jul 2012
Posts: 320
Forfar, Scotland
J
JER.Hill Online content
BritBike Forum member
JER.Hill  Online Content
BritBike Forum member
J
Joined: Jul 2012
Posts: 320
Forfar, Scotland
Maybe is a good time for the site to look at a different and simpler way of loading photo's onto the site!

Just saying

John

Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: JER.Hill] #700850
07/05/17 4:28 pm
07/05/17 4:28 pm
Joined: Sep 2013
Posts: 1,642
Pacific northwest
Q
quinten Online content
BritBike Forum member
quinten  Online Content
BritBike Forum member
Q
Joined: Sep 2013
Posts: 1,642
Pacific northwest
Originally Posted by JER.Hill
Maybe is a good time for the site to look at a different and simpler way of loading photo's onto the site!

Just saying

John


This site already offers photo upload-storage directly from your device , , with premium membership .
Free membership allows us to get on board , premium membership offers a bigger seat .

... Snipped from a similar thread , just a few days ago...
Originally Posted by Morgan aka Admin
..., who is blackmailing you? It's not me/britbike. I have nothing to do with photobu...
This forum has been online 21 years and would have been long gone If I had not found sponsor help in the past.
See this page scroll all the way to the bottom.
http://www.britbike.com/sponsor/

The first years was not cheap I payed the same amount that you would buy a decent running BSA A65. Every year.. Familiy was not happy to see holiday money spent on a website.
Then members and companies started to contribute and with out that help it wouild have eventually been closed.

Luckily that did not happen. Still there was no way to upload photos but that changed along the way.
However there was still an issue that the database and storage was limited.

Still I wanted to offer image upload service and a new member account was created the Premium member who can upload images and documents.
You see over the years spammers, scammer and other non wanted creatures will take advantages andpost whatever they like and it will be annoying and we just don't want to deal with that.

The premium members group that pays about a dollar per month is perfect you see a scammer will not likely apply for membership and the pay the 12.95 dollars because it will
reveal their identity.

BTW nothing is free.. you may think that this website is free but as I mentioned it is the sponsors that pay for it. As a "free" member you don't get all the benefitsbut quit a few.
Cheers
Morgan your admin.



Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #700915
07/06/17 10:20 am
07/06/17 10:20 am
Joined: Jul 2012
Posts: 320
Forfar, Scotland
J
JER.Hill Online content
BritBike Forum member
JER.Hill  Online Content
BritBike Forum member
J
Joined: Jul 2012
Posts: 320
Forfar, Scotland
Hi Quinten

I'm not really into the computer world and in no way was taking a dig at all the good work done by Morgan with the site.

regards

John

Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #700946
07/06/17 6:44 pm
07/06/17 6:44 pm
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
testing, seems to work. trying the Attachment Manager, not sure how to place with regards to text.
Have grabbed this pic from my PC, but the edit box does not show where it will end up.
I am struggling to find some of the early rebuild pics, they are in the PC somewhere though, I will start editing from the top when I find them.

Attached Files 1971 Devimead siamese pipe circa 1983 001.jpg
Last edited by gavin eisler; 07/06/17 6:50 pm. Reason: trying out pics

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] #701076
07/08/17 2:03 am
07/08/17 2:03 am
Joined: Apr 2007
Posts: 754
Brisbane, Australia
BrizzoBrit Offline

Life member
BrizzoBrit  Offline

Life member
Joined: Apr 2007
Posts: 754
Brisbane, Australia
Hi Gavin,

You cant position images with AM, they all line up at the bottom. You just have to add images to AM in the order you want them to show up. To view in the post, click on the images to get a 'full size' view. I find 1000 pixels on long axis seems to get the file size close to the limit. As noted by someone on the pukebucket thread, it's worth adding a caption. I haven't sorted that yet. Also, the preview post function doesn't show the images so if you get it wrong you need to edit the post.

Sorry you lost all your images. Lots of valuable information now MIA for lots of threads. GRRRRRR!

Keep smiling
Ray


BSA 1969 A65F
BSA 1966 A65H
Triumph 1968 T120
Kawasaki A1R
& too many projects!
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #701209
07/09/17 2:28 pm
07/09/17 2:28 pm
Joined: Dec 2004
Posts: 9,082
Scotland
kommando Online content
BritBike Forum member
kommando  Online Content
BritBike Forum member
Joined: Dec 2004
Posts: 9,082
Scotland
I suspect the Photobucket will go either of 2 ways.

1. They see sense and back off and restore previous function (it's not even as if their definition of 3rd party agrees with anyone elses)

2. They go bust and disappear.

So you can wait or not but either way its best to get all the pics before they disappear.

You can still get to all your photos in photobucket, you can download them by downloading each album which you then get as a zip, I had one zip with 240 images inside.

Sign in to photobucket, go into library, select an album and look at the bottom right and under 'Action' there is a 'download album' button. Go into each of the library's to get the download, each one is a pain with all the clicking and waiting but its better than searching 2 pc's and 5 memory cards in my case.

Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: BrizzoBrit] #701470
07/11/17 6:12 pm
07/11/17 6:12 pm
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
Thanks Ray, great info.
And John , thanks much appreciated.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler] #702726
07/25/17 10:28 am
07/25/17 10:28 am
Joined: May 2013
Posts: 4,684
Rotherham - S. Yorkshire
Allan Gill Online happy
BritBike Forum member
Allan Gill  Online Happy
BritBike Forum member
Joined: May 2013
Posts: 4,684
Rotherham - S. Yorkshire
I thought I'd add this here as you have carried out this modification with some of my recommendation.

After running the same cylinder head on my bike for the last 3 years, port modified with JB weld, I did a head swap over the weekend because I felt the guide was failing. In fact one of the cylinder stud holes had seen better days and it was actually pulling oil in. Anyway long story cut short in the last 12 months fuel has started to eat away at the JB weld leaving very little left. Infact I think it's more within the last 3 months as performance characteristics has changed.

The good news is the valves and seats are perfect still, some carbon on pistons but I think this was from the oil and not the epoxy. This softened quickly by dropping the pistons in the bore and filling them with toluene to soak. This also checked the ring seal too which was flawless as Toluene will seep past most things.


beerchug
Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler] #702828
07/26/17 10:22 am
07/26/17 10:22 am
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
Thanks for the heads up Allan, I did use JB weld, Will pull the carbs and check.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler] #702962
07/27/17 7:19 am
07/27/17 7:19 am
Joined: May 2013
Posts: 4,684
Rotherham - S. Yorkshire
Allan Gill Online happy
BritBike Forum member
Allan Gill  Online Happy
BritBike Forum member
Joined: May 2013
Posts: 4,684
Rotherham - S. Yorkshire
You might be fine for. Few years Gavin, this head of mine was done in 2013, and not that long ago was checked - last year. And was fine.


beerchug
Re: alloy barrels + 5 speeds A65 750 OIF 1971 [Re: gavin eisler] #711237
10/11/17 8:34 pm
10/11/17 8:34 pm
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
gavin eisler Online content OP
BritBike Forum member
gavin eisler  Online Content OP
BritBike Forum member
Joined: Aug 2001
Posts: 3,517
argyll. scotland, uk
An end of season update. nearly 7K miles. All good, no major issues, have replaced the Headlamp lense reflector with a Wipac QH unit, huge improvement.
Pics show new front mudguard/ fork brace made from 2mm SS, lowers the mudguard a whole inch.

Attached Files IMG_0402.JPGIMG_0397.JPGIMG_0398.JPGIMG_0403.JPG
Last edited by gavin eisler; 10/11/17 8:34 pm.

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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