76A gearbox noise ??

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elan1972
Posts: 3
Joined: Mon Sep 27, 2021 9:17 am
Location: The Wirral

76A gearbox noise ??

Post by elan1972 »

Excited that i have recently acquired my first kettle,a 76A that had the engine rebuilt (lots of photos- in 2014) and covered less than 1000 miles before being taken off the road these last 7 years.Just put new starter clutch rollers and got the starter motor working well. I got her running and the engine sounds good if i keep the revs above 1500 but as the revs drop nearer 1000 there is a horrible crunching/clattering sound that appears to be coming from behind the gearbox sprocket. It lasts till the engine stalls or i give it a rev. I can select all gears and turns the wheel ok. Gearbox sprocket is good and tight.
All thoughts and ideas appreciated.
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Alan H
Posts: 12104
Joined: Fri Aug 05, 2011 6:38 am
Location: Wombwell, Republic of South Yorkshire

Re: 76A gearbox noise ??

Post by Alan H »

They all do that sir!!!
Clutch bearings are unhappy, but there will be others along with a cure soon.
Proof that four strokes are over complicated
elan1972
Posts: 3
Joined: Mon Sep 27, 2021 9:17 am
Location: The Wirral

Re: 76A gearbox noise ??

Post by elan1972 »

Thanks for your reply Alan. I doubt they all sound like this. Don't know how to upload a video here so have posted one on the FB Suzuki Gt750 owners page if you get a chance. Cheers
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mick 63
Posts: 909
Joined: Thu Nov 12, 2009 7:20 pm
Location: Lancaster,Lanc's.

Re: 76A gearbox noise ??

Post by mick 63 »

Hi Elan , i saw your video on facebook , and they do sound like that, carb balancing will get rid of most of that and maybe tweaking your tickover , cheers Mick ;)
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