I have been having an issue on and off this season with the back plugs fouling. Took it into the shop and they are not sure why it keeps happening. Happens especially if the sled has sat overnight outside, fire it up in the morning it will back fire. Replace the back plugs and will fire right...
i just bought an 08 skidoo summit x 163 and i have fired it up a few times and it has started and ran fine.. just changing plugs and chaincase oil for the season and the plugs have brown oil on them and are wet.. i dont know if this thing was summerized when i got it and it has been started 3...