Have a 96 Mach-z 780 with 3800 KM on the motor . Well yesterday , I couldn't handle it any more I had to start it up LOL ! Then I drove it off the front of the trailer and around the front yard and into the garage . I done a Compression test with the motor warm , got a 105 105 110 That's a little LOW !! What do you guys think , Time to take the motor out ? I have never took a liquid cooled motor apart . OH And I can't get the secondary clutch off , I also took the rear suspention out .. found 5 bad bearings .

Those compression reading are not acceptable for a Skidoo, mid 130's would be "ok" but no less.
First off you should have much higher readings with so few km. I would get another compressing gauge to compare.
Skidoo's are notorious for the secondary sticking but not so if you do regular yearly maintenance like putting a small amount of anti-seize on the shaft.
Soak it down with penatrant but the real fun begins when you try to get the secondary apart, if you have not taken it apart and cleaned-inspected it on a yearly basis then you might as well throw it away because it is welded together.
The bearing failure in the suspention is common on all sleds, not many bother to grease them as part of summerizing and this is why you see idler wheels lying all over the trail in the beginning of the season.
Sleds are a BIG maintenance item and a lot of work to keep on top of. As I stated in another post I spend no less than 8 hours putting my sled to bed for the summer and have yet had a seizing problem in the countless thousands of miles I have rode. It's all part of the game unless you buy new every year...........

I would get a second compression tester,preferablly a good one,and redo your test.It looks good from a high to low stand point,i think you will find the tester or the test is the problem.I would guess to have all clyinders low,but the same ,would be a stretch.

I would not condemn a engine on a compression check alone, a clyinder leak down is the only way to go.

Originally posted by Mikadoo@Aug 22 2004, 06:46 PM
The bearing failure in the suspention is common on all sleds, not many bother to grease them as part of summerizing and this is why you see idler wheels lying all over the trail in the beginning of the season.


Hmm, I always thought it was from landing from too high of an altitude...

I would try another guage first. Hold the throttle wide open with 6-8 pulls. If no better then she needs to be done. If the stock pistons are still ok and the bore isn't too big for them, you can buy rings from Royal dist for the SPX pistons that are alot cheaper than the Bomber rings. The SPX rings will fit the stock pistons. 45 per ring from Bomber and 18 per piston from SPX. Or if you need to go 10 thou over then get the SPX piston kit. 60 something each. I've been running them in my improver for the last year and no probs. 9300 rpm

I think you should get another tester because you shoulden't need a rebuild with that many KM's but the bearings would be not enough grease....the way I look at it 3 doller tube of grease do the whole sled but I had 2 idlers go last year just the rubber and I replaced them the C-clip and the bearing it was about 150$ the grease is cheaper

Mikadoo, you're telling me you take apart all the idler bearings every year and regrease them?? I've always just replaced them every two years or so...

Originally posted by Russ Wheeler@Aug 25 2004, 07:08 PM
Mikadoo, you're telling me you take apart all the idler bearings every year and regrease them?? I've always just replaced them every two years or so...
341385


No, I have a very small diameter needle greaser that you can get at any Ford tractor dealer. Doesn't take very long to doo but some wheels have to be removed to get the needle in. It will push the water right out of their. :D