Compression Test on a Snowmobile- How to?

This compression test was done on a 1997 Yamaha Vmax SX700 Snowmobile. The same principle can be used on any vehicle engine. Requires a compression gage set with appropriate fittings.

[@ireneehache]

i just check my 96 enticer11 and its at 120psi on the two piston and i have a 2000 venture 600 tripple and it gives me 120psi on the three piston so it must be good for a while

[@shawnnelson6146]

Do you pull compression test on a warm cylinder?
As piston warms and expands to fill the bore.

[@bolduchenri]

His a sx viper 700 the same even if my head his black? Because i wante to no what his the original compresiion on those motor!

[@vulcanizerrecreationalvehi5182]

Sir, I would check a manual for SX viper 700. This snowmobile is older and has different compression. 120 psi is considered best.

[@davidrenwick6718]

That engine is in need of a top end

[@vulcanizerrecreationalvehi5182]

Yeah it was on the low side. I sold some of my snowmobiles as I want to spend more time riding and less time maintaining them. Seems like the reverse has been true in my case.

[@WillEverything]

Nah man. That thing needs a rebuild. Rings may do the trick. But you should also check compression when its warm so parts are expanding in the cylinders. Should be at least over 110. 120+ is optimal. Also doesn't matter much if you hold the throttle down or not. Really makes no difference.

[@vulcanizerrecreationalvehi5182]

Good thing I got it sold a few weeks after the video was made. No more worries.

[@ireneehache]

your right i try holding the throttle and not holding and i got the same reading

[@martinfarrell5778]

90 is low..