Compression

[2012switchbackassault]

Whats the compression supposed to be in these new 800s

 

[assault11]

Between 110-120

 

[IQRIDR]

Depends on your elevation. 110-118 or so at sea level with a stock head, 122-130 with a 12.5:1 head.

 

[2012switchbackassault]

Yeah I'm riding in Saskatchewan so I figure that's 0-3000 range.. Yes stock head too.. I was just curious my tester was saying 105 both sides

 

[NapaMatt]

Ur Fine.... pull Rode and Ride... Repeat!!

 

[CO 2.0]

Different, old, and used gauges can cause max readings to be off a bit. Most important thing is that both cylinders are close to each other. Since you have 105 on both cylinders it sounds like you are fine.

 

[Old Scud-doo]

105 in one 107 in the other. Kept fouling plugs when cold. Had it tore apart and the rings were chipped/flaking with some pretty good piston wear/damage. So...I don't know if compression is always the best indicator of the shape of a motor. Just my opinion since I fought the problem for 2 months with those compression numbers to only find out that the motor wasn't "fine."

 

[IQRIDR]

105 in one 107 in the other. Kept fouling plugs when cold. Had it tore apart and the rings were chipped/flaking with some pretty good piston wear/damage. So...I don't know if compression is always the best indicator of the shape of a motor. Just my opinion since I fought the problem for 2 months with those compression numbers to only find out that the motor wasn't "fine."

I would have been doing an inspection with only 105-107 anyway. If your compression tester is good quality and in working order that's on the low side IMO...at least for those of us who have dealt with the cfi 800's for a few years

 

[Old Scud-doo]

Well the dealer, not my local dealer, that I took it too thought they were within spec's so nothing was done...until 2 weeks later.

 

[dennism]

compression

I checked the compression on my 2012 pro 800 with 450 miles on it in a warm shop. I got 125PSI on each cylinder with snap-on gauge and electric start.
I'm at 2000' elevation, motor is all stock.