Uscanga >>> bad ground conneccion chek all ground cables
probably because it likes fish sticks
check your crank sensor. also check your timing chain tensioner. also your fireing box could have have a short. check your grounds on the complete bike if a ground is bad it will cause all sorts of problems. good luck
For a 1997 Polaris Scrambler 400 4x4, the recommended gas-to-oil mix ratio is typically 40:1. This means you should mix 3.2 ounces of 2-stroke oil per gallon of gasoline. Always use high-quality 2-stroke oil and ensure thorough mixing to keep the engine running smoothly.
if it only backfires when shutting off, usually this means its getting to much gas!! if it backfires will running adjust carburater.
the seat on the exhaust valve is dirty so the valve does not seal it.... not sure how to clean it
The polaris 500 uses coolant because if it gets mud or twigs the engine will keep running.
If any car backfires it is usually due to retarded timing, running lean or a problem in the valve train.
running lean can cause your 400ex to backfire ..if it backfires on deceleration its lean ...if it pops on acceleration its running rich.====carb issues
Needs a tune up? Bad timing?
No, I recommend go to a mechanic, chances are your firing order is out or running bit to much fuel
It's broke
28 thousandths .028