I am now moving on to rebuild my gearbox since a mainshaft bearing collapse (on top of the various other mistreatment and bodges the bike has been assailed with) seems to have been the reason why the bike was pushed into a shed 35 plus years ago.
I am aware of changes in the early 60's to the gearboxes meaning that the parts differ. Given that the gearbox could have been from the 650ss or the 99 I should like to positively identify which parts I should be buying.
The gearbox number is NA5111 which from my research I take to be a later one and most likely from the 650ss.
Can the wise ones of this forum please confirm or otherwise my conclusions?
Many Thanks
Hello Alan - Yes your…
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Thanks Howard
Thanks Howard, can I assume that means I go for a 64 on gearbox refurb kit? I have already noticed a difference in bearing offerings from the usual suppliers.
Best Wishes, Alan.
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Hello Alan - Yes your gearbox is an early 650SS AMC type and is known as the AMC2 variety. This gives you the slightly different ratios and a stronger kickstart spring arrangement. Get a strong European bearing if you can - SKF , FBC etc . Regards, Howard