ENGINE RATTLE/ NOISE

[gwilkinson]

Hi, i have done the clutch death thingy with the pin etc but i were still getting a shocking rattle (worse on idle but there at all speeds). Before doing the clutch thing the carbs were ballanced, and valve shims set. The rattle is coming from the starter motor area (heard with a screwdriver on the crank case). So with this rattle getting evermore irritating i took out the engine and split the crankcase.... after checking the starter chain and guides for wear, which are ok, i found the noise was coming from play in the starter clutch gear and starter idler sprocket. I have checked the play on the idler sprocket spindle and thats ok.. the only play i can find is between the two cogs themselves approx 1mm. The gear teeth look a little worn but at 31k i would'nt have thought this would have worn this quickly! Has anyone any ideas why or has anybody got a fix (other than visiting the yam dealer to be robbed in broad daylight!)

many thanks...
man with engine in many tiny pieces but hey... no rattle now! ;D ;D

[CD]

I wouldn't expect 1mm backlash to be enough to cause the noise, but with the engine in bits I'd be looking at changing the cam chain and its tensioners -

- and be taking a close look at every rolling bearing - just in case.

[gwilkinson]

hi, upon further investigation i have now discovered that the primary chain has stretched and is slack therefore not putting any tension (pre-load on the starter gears- hence rattling). so the chain needs replacing and so doews the hydrauic tensioner.....these are quite pricey so does anyone know of a knackered engine with a top end problem of whch i can swap bits off? any news is good news eh?
many thanks, gary

[CD]

Maybe the hydraulic tensioner stopped doing its job and taken primary chain down.