cmpression problem?

[jerry1230]

I have a prblem starting my 600 XLT triple when it is cold. Ithas 85 lbs of compression. Could this be the problem. any info would be helpfull Thanx Jerry

 

[mxz sledhead]

Forged alum piston knowen to do that if that is what you have cause the
heat of conbustion expand piston do atest when motor operate temp
compare the findings justa.thought . mxzsledhead

 

[mountainbigbull]

I checked my XLT a while ago. It was in a warm garage I had about 120 psi (if I remember right) it was even on all cylinders. 85 is low but normally hard starting due to low compression is more when it is hot but 85 is low and would cause hard starting I would think. Is it 85 on all cylinders? How many miles on this engine? Cold vs. warm should be very little change I wouldn't expect no more the 5 psi. I got slightly less when it was warmed up. Is the 85 checked at cold or hot?

 

[switchbackfst]

time for new top end

 

[papajake]

have a set of high compression heads for 600 polaris there shaved for high octane gas for free