2004 polaris sportsman 600 twin 4x4 backfiring
#11
Check the tank vent line also to make sure it's not blocked or kinked. A simple thing like this can stop one from running right or can just die out right from a vapor lock in the tank.After it gets a "glug" of air,some will run ok for awhile until it does it again. Same thing on the carb atmospheric vent. Has to be clean and open.
#13
#14
#15
Usually the Kokusan ignitions are good systems,same as what most Ktms use also but with electrical components anything can happen. Plus if it hasn't been ridden that much or the fuel hasn't been treated with a good stabilizer or sometimes even if it has,you can have gunk in the jets, needle and seat,etc. Hopefully a good cleaning may be all that it needs.