Compression test on '14 Pro 800

[HCR800<3]

Hey there ladies and gents. Did a compression test on my '14 pro 800 the other day. It was 110 at wide open.. Good or bad? Polaris dealer I called said they won't do anything within 10%.. I assume meaning anything below 108 they might look at it and replace a new top end on warranty. I'd rather that then getting towed out later in the season and needing a new crank and all after seizing .. Thoughts and opinions?

 

[TylerG]

Hey there ladies and gents. Did a compression test on my '14 pro 800 the other day. It was 110 at wide open.. Good or bad? Polaris dealer I called said they won't do anything within 10%.. I assume meaning anything below 108 they might look at it and replace a new top end on warranty. I'd rather that then getting towed out later in the season and needing a new crank and all after seizing .. Thoughts and opinions?

my thoughts, you're too hard on chit Sam

I'm sure some of the poolaris guys will chime in soon!

 

[floogan]

Test both cylinders ie mag - 110 psi then pto should be no lower then 99psi or vice versa
there is no actual compression specification
ie testers could be off 5 psi on tester to another
so if you had 120 and 108 there would be an issue

 

[floogan]

LOL!!! Poolaris

 

[Staple_STI]

I did mine and it was 118 per side. I thought spec was around 120-122 for these Liberty Engines

 

[floogan]

hcr8<3

HIGH PRAIRIE ....THAT IS ALL

LOL!!!!

 

[moto5151]

Just buy a new one Sam.

 

[Merc63]

Try another gauge. Those gauges are known to be off lots of the time.

 

[JMCX]

I do a compression test after every trip. On my 13 Pro 800 I have never had it as high as 120. Between 107-115 is typical with my gauge at Calgary's altitude.

I wouldn't give five cents for some compression testers but most are good for cylinder to cylinder comparison.

 

[dragonweld28]

Just do yourself a favor and put the MTNTK fix kit in and be done with it. I know lots of guys say," I still have warranty," but why would you risk a helicopter bill and losing a weekend riding when you can rebuild the top end for less than $700. They run better, have more power and are more reliable. Its a win, win, win. Polaris has the worst motor but, I think, but the best handling and riding characteristics. Screw that warranty and get the fix kit. Even there kit with a head is only $799. That's dyno'd for almost 8hp. I have been dealing with these ****ty motors for 5 years now.... just get the fix kit.... Rant over.

 

[Wilk INStheWEST]

Just do yourself a favor and put the MTNTK fix kit in and be done with it. I know lots of guys say," I still have warranty," but why would you risk a helicopter bill and losing a weekend riding when you can rebuild the top end for less than $700. They run better, have more power and are more reliable. Its a win, win, win. Polaris has the worst motor but, I think, but the best handling and riding characteristics. Screw that warranty and get the fix kit. Even there kit with a head is only $799. That's dyno'd for almost 8hp. I have been dealing with these ****ty motors for 5 years now.... just get the fix kit.... Rant over.

Agreed, my 12 engine is currently torn apart and ready for the MTNTK drop in kit to be going in.

 

[Jesse_01]

110 is about right for a cold compression test . The Polaris sleds have lower compression than the 800's. Main reason why the poo make less power. A piston fix kit will bump you up 10 psi or so.

When running a turbo its coming for them to wear out the rings and lose psi also. The piston will look fine but you will be down 15-20psi.

 

[HCR800<3]

Thanks for all the useful opinions guys, means a lot I'll look into that kit!