I don't have a torque wrench (should probably get one) but to me the bolts seemed a little loose (especially the two by the exhaust) so I tried tightening them up a bit but it didn't do anything.
I haven't been able to spend much time on this thing lately because it is only cool enough to work outside before 7 in the morning or after 8 in the evening. I still have to pull the carb off again and see if there is anything wrong (like the ball-check valve you mentioned) in the little yellow plastic fuel tubes.
Maybe one of these days the weather will be cooler and it will give me break so I can work on it. I would take it to the service center but since they are the only one around here they said they are 10 weeks out (
) on doing any repairs or service for anyone (I guess partly because they service chain saws for the forest service so they are probably very busy).
So, maybe one day I can tear into this thing myself. They aren't especially complicated are they? Where do you start (or what are the basic steps) and what do I need to look out for in the disassembly process? Also, what should I be looking for that might be a sign of the trouble (besides the head gasket)?
Last, I noticed that the top of the piston is very black and oily and nasty looking. Does that indicate anything?
Once again, thanks to everyone for the help!
OUR CNC machine is named Joe, and he has this week of school off. He eats candy instead of electricity. Not so accurate or repeatable, but very easy to re-program. - Not2B [more] 
17-07-2005, 23:27
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