EC 300 cylinder pressure

[iancp5]

Originally Posted by kendunn

I am not sure what a GG is, but I looked up a Honda CR250 2t and it was at 8.5:1. I never understood these high compressions.

Compression ratio on a 2 stroke is always much lower than 4 stroke and I am never sure if they quote some virtual ratio using the stroke or the real ratio from when the exhaust port is closed. Additionally the working compression is hugely effected by the pipe and rpm although I don't suppose this has any effect when you're kicking it to get a test reading. That's why I assume the advice is test when it's known to be good so you have a reference with your own guage and speed of kick.