top end rattle

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Addicted
Posts: 1
Joined: Mon Jun 29, 2020 8:18 pm
My Bike: Ducati 749

top end rattle

Post by Addicted »

I have a '91 ZXR400 L1 bought last year as a 'looked after bike' .
So far I've gone through the bike replacing worn out components etc , engine ran Ok but not great on the bottom end but ran fine at the top end with no nasty noises . Then a couple of months ago I was got back from a ride out ( bike ran fine ) it developed a top end tapping ( quite loud ), shut it down and restarted and it ran fine again. Got set for a ride out last month and the tapping started again, sounded like valve clearance problems so I reshimmed the valves to factory specs and while I had the bike partially stripped down I rebuilt the carbs. All appeared to go well so I put everything back together and started the engine..... still got the tapping .....
Cam lobes have no surface marks and rocker arms appear ok, I'm thinking oil starvation to the top end? I did start the motor with the cam cover off and apart from the 3 oil feeds over the top cam chain sprocket there didn't appear to be a massive flow of oil over the cams.
Any suggestions please?????
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