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Re: Barn Find Beeza
Psychopasta #785024 09/22/19 12:50 am
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Weird barrel nuts for a 70, would have been bihex originally, the flange looks thick enough, measure the studs OD are they 3/8th".?


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
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Re: Barn Find Beeza
Psychopasta #785027 09/22/19 1:09 am
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The end float is clearly noticeable by hand, and I can hear a clunk as I push and pull the end the the crank... eek

Re: Barn Find Beeza
Psychopasta #785028 09/22/19 1:17 am
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So I got the top end off. Loosened the rockers:
[Linked Image from i.imgur.com]
and knocked out the cams and took off the rockers carefully labelling everything. Then it was time fro the Whitworth and Hammer:
[Linked Image from i.imgur.com]
Got all the bolts off, including the deeply recessed one. The top end came off with just a little encouragement froma block of wood in the ports and a hammer
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Here's the lower part:
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Copper washer looks OK
[Linked Image from i.imgur.com]

Re: Barn Find Beeza
Psychopasta #785029 09/22/19 1:22 am
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And here she is at the end of play today:
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Re: Barn Find Beeza
Psychopasta #785040 09/22/19 3:27 am
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Dogs and gears look pretty good, make sure the camplate tracks for the selectors and the index plunger are not worn too badly.
When you shim the layshaft do it from the drive side. (the factory never did it!) As Gavin says, a couple of thou endfloat is all you want.
All looks pretty good so far. If the rotor is out for any length of time a keeper is needed. (just use the stator)
If you use a drop of loctite on the timing side crank locknut, you can dispense with the tab washer.
As you've probably found out, it's easier to remove the oil pump and worm drive as one. You don't have to do that if you use 3 bolts
rather than the original studs for the pump.

That's a 5/16 top end Gavin, probably cases too, that's why the hex nuts.

Last edited by NickL; 09/22/19 3:31 am.
Re: Barn Find Beeza
Psychopasta #785058 09/22/19 9:33 am
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The cases have the BSA embossed number pad, weird to find 5/16" barrel studs.I thought the embossed number pads all came with 3/8" barrel studs.


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
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Re: Barn Find Beeza
Psychopasta #785073 09/22/19 1:41 pm
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Head also appears to have small studs. Maybe a set of factory replacement cases?

Re: Barn Find Beeza
Psychopasta #785076 09/22/19 3:05 pm
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All the unstamped factory replacement cases built later I have seen come with the updated threads etc, ie cycle becomes UNF/UNC, the exception is some B25 cases made in 71 which had the narrow rear mount for 70 and before. There should be some small stamps on the crankcases showing a date, this started from 69 onwards or maybe earlier.

Re: Barn Find Beeza
Psychopasta #785115 09/22/19 9:36 pm
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OK, so now for the money shots. In as much as, how much money is this gonna cost?

I got the cylinder barrel off after using some heat to soften the gasket, which was clamping tight. Here are the pistons:

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]


and the bowel of the beast
[Linked Image from i.imgur.com]

Re: Barn Find Beeza
Psychopasta #785117 09/22/19 9:39 pm
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And the cylinders...
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Re: Barn Find Beeza
MarcB #785122 09/22/19 10:13 pm
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Originally Posted by MarcB
Head also appears to have small studs. Maybe a set of factory replacement cases?


No, the rear two are 3/8 as well.


That looks like a good set of barrels, the bores are evenly spaced, a lot of them were well over to one side.
Pistons look good, measure them up and check the ring gaps and bores, may not need any new gear there
just a hone and done.
Spend a while filing a 45 deg lead on the bores at the base, it makes assembly much easier.

Re: Barn Find Beeza
Psychopasta #785130 09/22/19 11:20 pm
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Yes--looks pretty good.
Suggestion: put some rag or some pipe insulation around the con rods to stop them banging against the crankcase.
Knocks and nicks start fatigue failures.
Sorry Nick--not referring to you! (Brit humor).

Re: Barn Find Beeza
Psychopasta #785135 09/22/19 11:47 pm
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Did I spot a crack in #2 cylinder wall? I saw it in 2 pictures in a row, but later ones were blurry in that area, so I couldn't be sure.

Attached Files Screen Shot 2019-09-22 at 7.46.11 PM.jpg

'68 BSA Spitfire MkIV (w/ '67 numbers)
'81 Yamaha XJ550 Seca
'90 Yamaha FZR1000 EXUP
Re: Barn Find Beeza
Psychopasta #785144 09/23/19 12:57 am
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Hi David,

It does look like a crack, but it's just a scratch in the enamel. Looks fearsome:
[Linked Image from i.imgur.com]
but a little rubbing with wire wool:
[Linked Image from i.imgur.com]

Re: Barn Find Beeza
Psychopasta #785145 09/23/19 1:00 am
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Well, end of phase 1 today: engine is out of the frame:

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Now I have removed all the case connecting bolts, but it looks to have been stuck together with loads of sealant, and it has resisted moderate attempts to split the cases. Before I get medieval on it, any advice for case splitting?

Re: Barn Find Beeza
Psychopasta #785172 09/23/19 6:38 am
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Soak the cases in brake
fluid
cleaner around the sealant. It will soften it right up in a day.

Last edited by Allan Gill; 09/24/19 6:21 am.

Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Barn Find Beeza
Psychopasta #785187 09/23/19 12:57 pm
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Its very clean inside, may not have done a lot of work before being layed up.
Nice going, enjoy.

Re: Barn Find Beeza
Psychopasta #785189 09/23/19 1:15 pm
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Great looking pistons and barrels, but lots of oil in one combustion chamber.
Check your valves / guides clearances.

Re: Barn Find Beeza
Psychopasta #785190 09/23/19 1:16 pm
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Great looking pistons and barrels, but lots of oil in one combustion chamber.
Check your valves / guides clearances.

Re: Barn Find Beeza
Psychopasta #785194 09/23/19 1:55 pm
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Thanks Allan, I would never have thought of using brake fluid.

Re: Barn Find Beeza
Psychopasta #785247 09/23/19 8:59 pm
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You have the old type oil pressure relief valve fitted , it may be worth replacing that with the late one especially if
you have an srm pump.
Should be running in a day or two eh?

Re: Barn Find Beeza
Psychopasta #785295 09/24/19 6:23 am
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Originally Posted by Psychopasta
Thanks Allan, I would never have thought of using brake fluid.
. Sorry Psycho, had a typo. It was brake cleaner I was thinking of, brake fluid might work as it will remove paint but I did mean cleaner


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Barn Find Beeza
Psychopasta #785306 09/24/19 8:48 am
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OK, well I'll find out soon what brake fluid does as it put it on last night beerchug

I must admit, I was wondering how on earth you found out to use brake fluid. Brake cleaner I can get, good solvent.

Re: Barn Find Beeza
Psychopasta #785310 09/24/19 9:18 am
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Petrol works as well, especially on Silicon RTV type gasket goo.
petrol makes RTV expand, thats why it isnt used on carbs.


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Barn Find Beeza
Psychopasta #785581 09/27/19 3:05 am
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Well, it turns out that brake fluid works pretty well too. Who knew? thumbsup

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Page 5 of 15 1 2 3 4 5 6 7 14 15

Moderated by  Allan G, Jon W. Whitley 

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