What is wrong with my Polaris snowmobile ??

Question

I have a 1991 polaris 650 tripple that is backfiring through the exhaust and has NO power when it gets warm. It revs as though its tied to a very heavy trailer... Changed the plugs to no avail.. help ?!

Answer 1

Our snowmobile did this too. If it has old gas in it that could cause this, so dump out all the gas that's in it and put some new in (if it's old gas) Check all your filters and see if the pipe is blocked with dirt clods or anything like that.

Answer 2

Your answer is in your carb.  Clean it out and you should see a marked difference.  The water in the fuel is a good idea too check as well.  Check all your filters including the gas filter, then make sure that your exhaust is not blocked.  good luck!

Answer 3

This may sound weird, but i had one that did the same thing. It turned out that there was water in the gas. I dumped all the gas out of the tank and cleaned the carbs. Mine would run fine when cold, then when it warmed up it would sputter and not move. When it was cold the water in the carbs was froze, so it ran fine. but when it warmed up, the ice turned to water and i had problems. Either way it would be a cheap way to see if this is the problem. Hope this helps