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Knocking T500K

Posted: Mon Sep 21, 2020 9:30 pm
by atkinsok
Guys, having sorted out the none starting (see my other threads) and got the engine running, I find that as the engine warms up, it has a heavy rattle/knock at tick over. (no knock when cold). The noise disappears as the revs increase although does reappear during odd times whilst riding as the rev rise and fall. Once on the move, the bike performs rides well. The bike has just been re-bored and fitted with GT750 pistons 9less than 100 miles) . I am no expert but my guess is that this is "piston slap" or perhaps something loose in the engine = it appears to be from the middle of the left cylinder. thanks for any suggestions

Re: Knocking T500K

Posted: Tue Sep 22, 2020 7:46 am
by Alan H
Some of the 500s tend to be a bit rattly, but shouldn't be after a rebuild. Perhaps the rebore was done slightly 'loose'. Maybe just something to monitor and enjoy the bike. Richard is the one to comment, he's got 2 of 'em!

Re: Knocking T500K

Posted: Tue Sep 22, 2020 6:50 pm
by PaulD738
A couple of things, did you replace the rods and small end bearings? also does the noise disappear when you pull the clutch in at tickover?
As Alan says the T500 ain’t the quietest motors anyway but you shouldn’t get a knocking noise.

Re: Knocking T500K

Posted: Tue Sep 22, 2020 7:41 pm
by Alan H