Author Topic: leaks from gear and kickstart shafts - any good mods?  (Read 962 times)

Offline t20racerman

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Hi all

I went a lovely 300 mile round trip on the bike last weekend and the BSA seemed to throw oil out of everywhere! I've now tracked down the correct felt washer for the sliding chaincase plate to slow that leak, can sort out one or two other small leaks, BUT it is even coming out of the gear and kickstart shaft opening on the gearbox cover. Not streaming out by any means, but after 300 miles without a wipedown it is a real mess there.
Clearly the two bushes have some wear and I can, and will, replace them but I wondered if anyone has tried fitting seals or anything here? Seems a better solution than just a tight bush (ooh err... ;)) If they are replaced though, is a seal necessary?

I appreciate that old bikes leak, and that trying to make it totally oiltight is a waste of time really, but I like to fiddle and mod things (hence the GT750 4LS front hub!) and I just wondered what your thoughts were.

(Oh, and NO, I didn't overfill the gearbox!  *smile* *smile*)
1961 A10 - somewhat modified :-)
1980 TZ350 - lunatic Classic Race machine
1967 T20 Suzuki - heavily modified Classic Racer
1967 T20 Suzuki - pretty standard road bike
2007 KTM 660 SMC - fast and furious supermoto
Triumph 675 Speed triple
Ossa 250 and yet another T20 racer in bits both being built up

"If I had all the money back that I've spent on motorcycles... I'd spend it all on motorcycles!"

Online bsa-bill

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Re: leaks from gear and kickstart shafts - any good mods?
« Reply #1 on: 22.08. 2011 16:19 »
Hi Adrian, I replaced the bushes on mine, not as effective as I'd hoped due to the fact that the kickstart  had wear on it too but just on the bit that runs in the bush , so I reamed the bush to allow the shaft through, result was the bush is tighter but not as tight as it should be, so still leaked a bit.
Also there was side play on the kickstart quadrant that allowed the bush to move through the box cover, I cut an old timing side bush to fit the kickstart shaft leaving it a bit short, enough to get an O ring in then the cut brush then the kickstart lever, so once the lever is on it holds everything up tight and has helped it a lot
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline wilko

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Re: leaks from gear and kickstart shafts - any good mods?
« Reply #2 on: 23.08. 2011 00:46 »
Just don't fill it up to the usual level. leave half a pint out! The commended level is for perfect world!