My old 1995 TE 610 engine dropped a valve so I bought a 1999 engine and which had destroyed rocker arms and re built it before putting it in the frame and when I start it it runs fine but there is a loud thumping/clunking noise, the cam chain is brand new and I checked the tensioner which seems fine but the noise is still there. When I kick it over without starting it i can't hear the noise. Does anyone have any ideas of what it could be?
Does it have auto decomp, or could the manual decomp be hung up? Did you check that the crank was still true?
Clicking noise has been getting louder on my 630 recently. The workshop expert tells me that the cam chain, valves, clutch etc. are perfect and that it´s likely a con bearing. B*gger!
Does the clunking disappear when you rev it, put it under load,? Then reappear on tick over?? If yes then could be big end bearing.
