Join Date: Apr 2019
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2005 400 4x4 FIS-Multiple Problems
This is my first post. I have a machine with multiple mysteries to me. I'm not a great mechanic, but I get by. The 4-wheeler ran fine through the fall, then one winter day started backfiring, then quit. Could not get spark when testing the plug like I do on my lawnmower (removed, connected, and grounded to case). Plug works fine on tester at my aircraft shop. I could get it to fire occasionally but not stay running. Carb has been cleaned and checked, and all is reassembled. I can now get it to start, but will not accelerate or run under load (high RPM or going up hill). Also having some backfiring. Have tried adjusting mixture to no avail. New plug, coil, and air filter installed.