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Messages - JulianS

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Pre War / Re: 1932 Blue star HELP!
« on: Today at 11:51:04 »
Contact detail for Jules will be found in The Star the BSAOC magazine.

Twins / Re: Identifying the age of a unit bottom end.
« on: 22 November, 2017, 20:58:59 »
Post some photos we may be able to identify.

Any casting numbers?

Twins / Re: A10 Squealing like a pig!
« on: 22 November, 2017, 09:49:19 »
Remove the primary chaincase and you will expose the gearbox sprocket.

Two possible causes of leaks -

First the large top hat seal behind the sprocket retaimed by a circlip - sometimes dificult to get the new seal in the hole as they seem to be very slighty larger diameter than the original.

Second - oil leaking along the bushes in the sleeve gear, usually worse when bike on the side stand. SRM do a neat sprocket retaining nut which includes an oil seal which sorts this out.

Twins / Re: A10 valve / tappet clearance
« on: 21 November, 2017, 11:34:33 »
You have a choice of any of the above - try and see which suits best.

Eddie Dow tuning notes attached.

Twins / Re: A10 valve / tappet clearance
« on: 21 November, 2017, 10:29:13 »
Not seen a factory figure for iron head and Spitfire cam. All the Spit figures seen for light alloy heads.

I ran such a combination for a few years and ran on 8/10 thou inlet/exhaust no problems. Also tried Eddie Dow recommended figure of 10/12 thou. Also fine no problems.

Attached is factory service sheet which has been annotated but do not know by whom.

I think you try various settings and see what is best. 10/16 will probably rattle a bit.

Twins / Re: A10 Squealing like a pig!
« on: 20 November, 2017, 14:57:42 »
Could be a bearing or bush spinning in the crankcase or timing cover.

Any bits in the sump?

Singles / Re: identify the gearbox
« on: 19 November, 2017, 14:11:27 »
Probably C10 C11 3 speed x 2.

Better photo would confirm.

Singles / Re: B40 kickstart
« on: 19 November, 2017, 11:17:39 »
Probable cause is poor quality cotter - they should be hard enough not to get mangled.

You should be able to find a good quality item if you make some calls to established dealers.

The cotter on my A10 is similar and has been fitted for years no problems not got mangled.

Some sellers are offering soft poor quality cotters more suitable for push bikes.

Twins / Re: S/Rocket dynamo not working
« on: 19 November, 2017, 10:20:06 »
Lots of useful info on this site which may help;

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 18 November, 2017, 18:57:32 »
That will not solve your problem. The oil in the return is aerated and will settle and that pipe cannot draw oil from the tank.

Wet sumping is either a poor scavenge side of pump/blockage in return  and/or leaking down the feed side either through the pump joints or gears or the non return ball valve in the system - theball and spring reatined by the grub screw you se by the main bearing bush inside thecrankcase..

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 18 November, 2017, 14:36:49 »
That is a lot for a dry sump engine. My A10 drains about 100 ml after standing overnight.

I always suspect the oil pump to crankcase joint and the condition of the pump. If it is worn then no hope of stopping it without soe external valve.

In the past I have used a valve like Mike to good effect. You just need to make sure the oil pipe both sides is charged with oil and there is no airlock in the feed side, which will stop oil feed.

Dot like taps too much risk of forgetting to turn them back on and the risk of an airlock in the system .

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 17 November, 2017, 16:50:25 »
If you have windows 10 you should have the program "Paint" which will resize a photo.

If you drain the sump do you get much oil? I did ot think the hole was low enough to allow a leak.If it drips from such a small hole there must be a lot of oil in there.

Twins / Re: Rocker box studs
« on: 17 November, 2017, 16:03:32 »
Most dealers should be able to offer you the correct length studs together with the sleeve nuts fitted at the carb end.

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 17 November, 2017, 11:20:41 »
I dont think that little hole is the problem, excess oil in the sump will either pass the rings and burn giving a smoking exhaust or will be pushed out of the breather - photo is how BSA describe the breather

Twins / Re: reluctant starter
« on: 16 November, 2017, 11:01:36 »
Have you tried the Boyer helpline?

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