APEX Compression

[mooney26]

I have a 06 APEX with a FFP turbo. Used heads shims last year to run on pump gas, went to Yamaha's low compression pistons this year. What is the stock compression supposed to be and what have you found the low compression pistons bring compression down too? After installing new low compression pistons, compression tests show 95 across all cylinders, seems low????

 

[guardrail]

probably get more answers in the turbo section

 

[ogre]

Make sure you test compression with throttle WIDE open. Does make a difference in readings

 

[mooney26]

A little hard to do motor is out of the sled