I am cleaning up a 3HP Brigg Model 92502.
When I took off the head I found quite a build up of sticky black residue. The valve seats were quite clogged up.
The unit had also been burning oil recently.
With the valves lapped in there is some compression but it's not great (can't measure it).
I was not intending on opening the crankcase so I don't know of a way to check out the condition of the piston rings. The piston bore is not scored.
My question is when do you leave something alone and when do you investigate further? I don't have a good track record of getting piston rings out undamaged and checking the piston rings is the only reason I would open the crank case.
Does the 3HP tend to wear its piston rings or do they go on forever?
Sorry this is so vague but I'd appreciate some views on whether you would leave alone or check the rings.
