Hi , a friend has a panther 440 and after he reaches 35 mph it spits ,sputters and backfires and wont go any faster.
The dealer told him it could be the middle crank seal(between the cylinders) I didn't even know there was one.
Could this be possable,?
He already tried another carb and coil and it still works the same.

bringing it back up, looking for ideas?http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/confused.gif?? http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/confused.gif *http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/wink.gif