I'm not surprised that they're taking the piston back. Like I said earlier, they were good to me. Sounds like you're on the right track now. Good to hear.
It sounds like they've increased the crown height of the piston...too much. Also, a beveled crown on the exhaust side is not the correct way to set port height. It hurts both compression and squish velocity. Bottom line...the piston isn't made right. They need to recall all of these and fix...
This is the second time I've heard of these issues with this version of Dominant piston. I wouldn't even consider running it. Sent it back for a refund.
That setup will give a false low reading. The volume of the adapter adds to the volume of the combustion chamber to make it read significantly lower than the actual compression. There MUST be a Schrader valve at the very tip that is screwed into the cylinder.
I quit taking saw work more than 2 years ago now. It was a combination of health issues and just being burnt out. I miss the side money, but just lost the ambition.
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