[snopromofo]

Looks like disassembly definitely required. Numbers?

 

[calltrex]

Link works. just shows up different

Plum Crazy

Installed Durapro tether this time. couldnt resist the purple. Normally would have got the cat tether

www.hardcoresledder.com

 

[Durgood]

130 PSI on mine cylinder 700 mi check

 

[Durgood]

130 PSI on each cylinder 700 mi check

 

[gillystvv]

Problem is there is ZERO accurate way to test it. Go borrow 10 gages. Is the lowest right? Is the highest right? Or all the rest average them out? There is no such thing as a certified gage. Most important, don,t say my , example, snap-on because it’s big bucks is accurate. And don’t assume Amazon one is correct or a pos. Pick one, and look for a drop or difference hole to hole. If 100 of you swear by your gage, who says your right, thoughts?

 

[patrioticinnovations]

Problem is there is ZERO accurate way to test it. Go borrow 10 gages. Is the lowest right? Is the highest right? Or all the rest average them out? There is no such thing as a certified gage. Most important, don,t say my , example, snap-on because it’s big bucks is accurate. And don’t assume Amazon one is correct or a pos. Pick one, and look for a drop or difference hole to hole. If 100 of you swear by your gage, who says your right, thoughts?

#76 - Does My Pressure Gauge Need a NIST Certification?

Gain a better understanding of the National Institute of Standards and Technology (NIST), their mission, and what it means for your pressure gauges. Learn what it means when a gauge has a NIST Certificate, when it’s necessary, and options for getting a certification for gauges in your current...

blog.qrfs.com

 

[biker66]

Problem is there is ZERO accurate way to test it. Go borrow 10 gages. Is the lowest right? Is the highest right? Or all the rest average them out? There is no such thing as a certified gage. Most important, don,t say my , example, snap-on because it’s big bucks is accurate. And don’t assume Amazon one is correct or a pos. Pick one, and look for a drop or difference hole to hole. If 100 of you swear by your gage, who says your right, thoughts?

Agreed. Accuracy is a crap shoot with most gauges, but I have found the quality names are pretty consistent. I have a good OTC one that is consistent with the expected cranking pressure for the last small block I put together.
But you are very right that the diagnostic value of a compression test is to detect differences between cylinders.

 

[just-pinch-it]

Gauge difference also temp will make a difference. Same gauge on same cylinder checking compression at 50* vs 120* will show different results. A pickled motor, prior to burning the extra oil out will be different then one that had it burnt off.

 

[calltrex]

I always use the same compression tester and thats why i always test my new sleds from brand new so i know what it was from the start. Last sled i had 8000km and the compression was the same as it was new with the same compression tester.

just be concerned if the difference between cyl is getting worse

 

[Mudgunner]

do a leak down test.

 

[BattleStorm]

What’s everyone getting for leakdown numbers?

 

[Steve Z]

Unless there's a chance in the way its been running I look for constaincy between the cylinders.

 

[northstarrick]

pretty easy to test or check your compression tester. we have a fitting for this. hook to a air line and compare the air pressure gauge with the compression tester gauge. by following the above, that would mean tire air pressure testers aren't accurate? that could be fatal. and yes the cheap ones are always off. SNAP-ON, OTC, ETC. were all right on.

 

[12meter joe]

Unless there's a chance in the way its been running I look for constaincy between the cylinders.

bingo

 

[AxysProS8]

I always use the same compression tester and thats why i always test my new sleds from brand new so i know what it was from the start. Last sled i had 8000km and the compression was the same as it was new with the same compression tester.

just be concerned if the difference between cyl is getting worse

Idk about u but the last 4 Polaris sleds I've bought always tested low when brand new. Around 5-800mi is where they started testing where they should be. Idk if its cause the rings and synthetic oil 🤷‍♂️ but new they never tested over 120

 

[orville-x]

It isn't a Matryx, but is an 850. Mine shows about 125psi on a warm engine, pulling it over one-handed. I've got just short of 9500 miles on it. Still have coating on the piston skirts, though it is worn off near the tops of the pistons.