1997 Ski Doo SLE Touring Fan Cooled - Snowmobile Forum: Your #1 Snowmobile Forum

Lisa's Ski Dpp · 06-22-2009, 06:51 PM

What should be aprox compression on this sled be. I am looking to
purchase it and I checked out the compression which read 90 psi on
each cylinder, is this compression all right or to low.
With that kind of compression do you think it will need pistons and rings soon?
It has around 1200 miles on it and looks in excellent condition.

JheLrey · 06-22-2009, 07:43 PM

Low... but did you test it with only that one spark plug removed, safety on, and the throttle wide open?

Lisa's Ski Dpp · 06-22-2009, 08:16 PM

yes only one plug out and did not hold wide open throttle. i guess i did it wrong? what is the right way to test

**RJ Gleason** · 06-22-2009, 08:36 PM

Remove all the plugs, leave ignition off and hold throttle wide open. Pull it over at least three times as fast as possible.

Lisa's Ski Dpp · 06-23-2009, 07:12 PM

Quote:

Originally Posted by RJ Gleason

Remove all the plugs, leave ignition off and hold throttle wide open. Pull it over at least three times as fast as possible.

doing this will make the compression go up or down

SkiDoo86 · 06-23-2009, 07:55 PM

Quote:

Originally Posted by Lisa's Ski Dpp

doing this will make the compression go up or down

Well it should go up. because there will be no resistance on the pistons. So ull be able to get max compression.

**RJ Gleason** · 06-23-2009, 07:56 PM

Compression should read around 120psi

Lisa's Ski Dpp · 06-23-2009, 08:32 PM

Quote:

Originally Posted by SkiDoo86

Well it should go up. because there will be no resistance on the pistons. So ull be able to get max compression.

what do you think the compression increase would be if it's at 90 psi now doing it the wrong way and then doing the compression check the correct way

**RJ Gleason** · 06-23-2009, 09:11 PM

See the post just above.

Lisa's Ski Dpp · 06-23-2009, 09:26 PM

so you are saying it will jump from 90 to 120

**RJ Gleason** · 06-24-2009, 08:23 AM

Quite likely, yes.
If it doesn't, then there is a serious problem.

Lisa's Ski Dpp · 06-24-2009, 11:11 AM

thank's to everyone for the info