Recent Posts

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Technical Section / Re: 1940 forks
« Last post by Owen on Today at 03:28:28 PM »
We are just in the process of adding the friction discs to the site shop. There are two type/sizes, 15-5050 small for the 1938 models and 15-5051 large for the 1939-46 girders. We will also be adding the (29-5225 & 65-5166) 1939-49 girder fork link bolt nut retaining ring set for BSA C10, C11 & C12 (350sv) shaft clips which are cheaper than on Ebay.
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Technical Section / Re: 1940 forks
« Last post by MilitaryRon on Today at 11:23:17 AM »
These are the 1940 forks Graham. I make the discs about 2 1/4"- 2 3/8". Ron
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Technical Section / Re: 1940 forks
« Last post by enfield49 on Today at 10:55:24 AM »
What size should the friction discs be in 1940 ? Graham
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Technical Section / Re: Crank bearing/bush timing side. Part No: 65-2052 Query
« Last post by izenoze on Yesterday at 11:46:21 PM »
As to how long an engine can run with a clapped out timing side plain bearing (technically it’s not a bush as a bush, by definition, does not have 360 degrees of rotation), well my engine when dismantled had a very large clearance indeed. So large that the flywheels were no longer perpendicular to the bore. This meant that every power stroke the connecting rod was thrust to the timing side. So much so that over time the land on the connecting rod wore a 0.020 deep groove in the RH flywheel. There was no sign of overheating on the rod

This made it difficult to get the sideplay right when I rebuilt the engine. The groove was machined out concentric to the crank pin hole, this involved mounting the flywheel in a chuck by it’s shaft and mounting the chuck in a bigger chuck. A bronze disc was then machined up to fit the recess

The bearing must have been worn for a very long time yet the timing gears seemed to have suffered no ill  effect. Of course the gears may have been changed at some point as it’s operational history is unknown. Must have made an awful clatter but as the roads are mainly dirt, potholes and loose stone in Fiji I guess the owner didn’t hear it or didn’t care
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Technical Section / Re: Engine Whistle/Whirr
« Last post by donkey on Yesterday at 04:47:03 PM »
That's champion well done it will not be long before spring time is here so you can enjoy the little bike.

donkey.
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Technical Section / Re: Engine Whistle/Whirr
« Last post by Goldfinger on Yesterday at 04:28:58 PM »
Update -
Just had it running with new washer and crank bearing (NB The old bearing seemed fine but wasn't such a close fit to crank) and the whirring has completely gone. It sounds grand now.
Thanks everyone
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Technical Section / Re: 1940 forks
« Last post by timsdad on Yesterday at 02:53:35 PM »
BSA moved in mysterious ways!

Ray
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Technical Section / Re: 1940 forks
« Last post by camman3 on Yesterday at 11:14:42 AM »
As Ron says, probably old stock pile,they wasted nothing in those days.
Graham
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Technical Section / Re: 1940 forks
« Last post by Owen on Yesterday at 10:41:29 AM »
I wonder why did they reduced the size of the friction discs for the 38 model and then go back to the earlier larger discs?
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Technical Section / Re: 1940 forks
« Last post by MilitaryRon on Yesterday at 09:12:46 AM »
Actually Ray, the forks fitted to the 1939 model C10 were the same forks as fitted to the 1934-36 B1's. Leon has confirmed via the parts lists. I've no idea why they went back to those earlier forks? Maybe they found an old stock pile? Ron
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