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Author Topic: 750 K1 grumbling gearbox  (Read 1866 times)

Offline 750rideruk

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750 K1 grumbling gearbox
« on: September 02, 2020, 05:00:04 PM »
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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Offline Bryanj

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Re: 750 K1 grumbling gearbox
« Reply #1 on: September 03, 2020, 03:42:48 AM »
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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Offline Trigger

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Re: 750 K1 grumbling gearbox
« Reply #2 on: September 03, 2020, 07:38:58 AM »
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  ;)
 
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