Quote:
Originally Posted by Jakobi
Good points.. But you'd also expect a fresh engine with a higher compression ratio to have higher cylinder compression too.
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I didn't read it was a fresh engine, I understood it to be a simple head swap and carb install. If, However, new rings were involved I would expect higher numbers after it was broken in.
Quote:
Originally Posted by mrkartoom
The test I did before shipping the head off was with the carb off, so just the reed cage in place. I pulled the carb before I remembered to get a test. The test after I put the modded head back on was with the carb on, WOT. Each test I did several kicks until the gauge would absolutely go no higher.
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Sounds like you got it right. If you didn't put new rings in then your numbers are a correction factor off, i.e.: right on the money. If you did put new rings in, you need to break the engine in and allow the new rings to seat before you test their sealing capabilities.