Triumphrat

Gibbsey

What should the cylinder compression of my 2006 Speed Four be? I've heard varying answers? Does anybody know?

BombFactory

I'm not sure if there is a factory number out there (I couldn't find one in the manual or even anything about testing compression). However, from my own experience, an engine with 12.5:1 compression ratio should be producing between about 180-250 psi warm, depending on cam profile and whatnot. The main thing is that you want consistency within about 10% between all cylinders.

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The Resurrection: ’02 CE Speedtona w/GSXR Forks
The Reviving: Speed-TT Project
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