I have an 04 and I have been running on the stock jetting since new. Has been running rich but never got around to leaning it out. the other week I went out riding in an area I have been before but is at a slightly lower elevation (2000ft, home is 2700ft). I had to use the starting enrichment to make it run anywhere. Just backfired alot. Even then it barely ran. Seemded to run better (not perfect) for a little while then got bad again. I checked the plug and it was white. Took the carb apart all jets seemed clean, ended up raising the needle to the last notch and the quad seemed to run decent.
Any idea what happened? the engine has been making a knocking sound well before this but seems unreleated to this problem (another thread).
Any idea what happened? the engine has been making a knocking sound well before this but seems unreleated to this problem (another thread).