If your pulling the engine over until the compression stops going up, you likely have a bad compression gauge. How does the compression feel? try testing the gauge on a another saw and see what you get.
?? It should have well north of 150psi period.Get it running and go burn a couple tanks through it. You're fine at 130 with fresh piston ring job. Go to working it and don't worry.
?? It should have well north of 150psi period.
By all means run it and re check. Did you use some assembly lube when installing the piston and cylinder? If yes that will actually falsely raise compression, which is the main reason you want to run the saw and let it cool down before checking compression after a fresh rebuild. 130 is really low for that saw.
Out of All the saws I or anyone else I know have rebuilt, ported and re ringed, I've never seen compression jump more than 5psi after break in. 130psi is far too low for a 661, something is off if it's that low.Until he runs it and breaks the rings in, initial compression numbers are pretty much meaningless. It's going to go up. Stop worrying and go to cutting. The assembly is done. Time to put it to work.
Out of All the saws I or anyone else I know have rebuilt, ported and re ringed, I've never seen compression jump more than 5psi after break in. 130psi is far too low for a 661, something is off if it's that low.
The only thing I could think left would be a worn out cylinder rings were set properly it was vacuum pressure tested.
It should unless it only leaking under pressure, which is not likely, dcomps normally leak under vacume.I’m using a Bosch that is less than a year old and it seems to work fine on my 461 it could very well be blowing the ring but I just think it is. odd that it does fine on my 461. Also on a vacuum pressure test Wouldn’t that detect a leak in the decomp?
All right do you not think the odds of the coating being worn too much on the cylinder is a possibility?
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