Forums 🚥 PiT STOP 🔧 Hyosung Technical Help Engine knocking
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♠️ M77.
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Apr 24, 2026 at 3:45 PM #22398Bike Model = : Gv650
After taking my gv650 out of winter storage i had a hard time getting it started, had to take out the old fuel and put in new fuel and also had to use starter fluid then after it started on starter fluid 3 times it was no problem getting it started, but the engine started knocking which it didn’t have the last time i had it running, so i am writing to ask for help since i have long work hours and not much time taking a proper look at it, i have been looking through the forum and suspect it is the cam chain tensioner but any advice would be helpful
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Apr 24, 2026 at 9:07 PM #22404
Could you possibly be able to record this ? and upload it to Google Drive , then get a public share link , post the link here to view it.
But do check the clutch basket , rattling is something spinning, so I hope it is just a thrust bearing for the clutch or 1 clutch plate that has worn down too far and it has cracked (Happens actually) then its just clutch overhaul job.
Tensioners Cam = I am not sure what to say just yet until you get it running fully or check the flywheel area to see if the sprag clutch is making noise there ? or a rattling worn out starter motor ?
Just have to find the source of the noise as far as you can.
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Apr 24, 2026 at 9:22 PM #22407
Could you possibly be able to record this ? and upload it to Google Drive , then get a public share link , post the link here to view it. But do check the clutch basket , rattling is something spinning, so I hope it is just a thrust bearing for the clutch or 1 clutch plate that has worn down too far and it has cracked (Happens actually) then its just clutch overhaul job. Tensioners Cam = I am not sure what to say just yet until you get it running fully or check the flywheel area to see if the sprag clutch is making noise there ? or a rattling worn out starter motor ? Just have to find the source of the noise as far as you can.
been trying to figure it out and then i had things to do but now i have done so
https://drive.google.com/file/d/1JSbKA8OWm4KNXcqw2iLHa1N-T33WRXqE/view?usp=drivesdk
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Apr 25, 2026 at 8:52 AM #22412
Would i be correct to say it sounds like an Ak47 in slow motion and where is the sound most loudest ? which exact part of the engine ? – Seems to be idling eneven, so also check your spark plugs incase one cylinder isnt burning properly
If the engine is cold, start it and put your hand on it and see if you feel anything that suggests something is banging against the walls ?
I am not able to decipher the video properly but my guess so far would be either clutch basket or top end
or one cylinder isn’t burning properly (causing uneven running?) – I haven’t even addressed the carbs yet (it will be the last thing unless plugs are pure white clean = no fuel in that cylinder)
Worst case scenario is that i really , really hope it is just a time to do valve clearances (if they were too loose , you would also get that Ak47 sound but usually happens at higher revs)
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