Valve clearance query
Posted: Fri Jan 15, 2010 10:17 am
I have just checked my valve clearances and come up with something a little concerning,I wonder if you guys can tell me what to make of it. Cylinders 1,3, & 4 are about spot on. Cylinder 3 has produced some different results. One inlet valve is bang on the other is 0.20mm and therefore 0.02mm out of tolerance and both exhaust clearances are out of limits, at 0.279mm each. It seems odd that three cylinders are OK and one has three valves out of limits.
I borrowed a boroscope to check the piston crown to see if there had been any damage but couldn't get it in through the plug aperture and as the carbs are off being cleaned so I can't run it to do a compression check. It seemed to run Ok when I bought it but I started a strip down as soon as I got it home so I have never ridden it.
Is it worth reshimming them to bring them back in limits or is it a sign of something more sinister?
I borrowed a boroscope to check the piston crown to see if there had been any damage but couldn't get it in through the plug aperture and as the carbs are off being cleaned so I can't run it to do a compression check. It seemed to run Ok when I bought it but I started a strip down as soon as I got it home so I have never ridden it.
Is it worth reshimming them to bring them back in limits or is it a sign of something more sinister?