Hi Grumpy, am having trouble getting the clutch off at moment, but have been able to locate the four screws that hold the crank case and the cyclinder together and they are that tight i am not able to tighten anymore, without going silly on them. Yes the chain and bar were on when it had a hissy fit, most certianly will be leaving them off till i know everything is good. Chain lubrication is good, plenty of oil. Will keep trying to get this clutch off.