Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: 750rideruk on September 02, 2020, 05:00:04 PM
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My 72 UK K1 has developed a grumbling sound from the gearbox while idling. I know about the primary chain noise so it is not that sounds a bit like a bearing. Bike has done 70K miles any ideas? sounds like it could be expensive.
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If its a bearing you wont know till you split it, i think they are all available from Yamiya in Japan(the ones with grooves are "specials" and not available from bearing suppliers)
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The output bearing is the first one to go on early 750's. Honda redesigned the crank cases to take a larger bearing on the K2 onwards.
50 year old bearings and 70,000 miles ! It is time for a full change of all the gearbox bearings and as Bryan has pointed out that it is lucky that they are all still available ;)