I have a 02 pro x 440 and befor it would do 90 95 easy but now it only does 70 and I changed both pulgs so I dont know what it is does any one know if you do please help me out thanks alot !!!

Try posting the question it the polaris forum. *You will probably get more guys to look at it there. *http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/confused.gif

check your belt * * * other than the plugs fouling thats the only other thing that can wear out * * *also, did it just all of a sudden do this(like one day it was running good the next ....) * or was it a slow process?

It was the next day it was bad and now it has not gotten better.

prox440 *make sure you are getting good gas, and it is always a good idea to use isopropyl alcohol in your gas. *http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/wow.gif wow you say you are getting 90 to 95 miles per hour out of a 440 fan? i find this a little high because my 2000xcsp600 with 23/40 gear ratio @ 8250 rpm only gets 96 miles per.