Hello, a month ago i had an accident with my atv and by now i fixed it, since then it backfires and sputters like crazy while going around(in drive), i cleaned the carburretor, changed the spark plug and filters but it still does it, it doesn't have any problem while in neutral but once you start moving it starts firing and doesn't want to go over 3800-4600 rpm exactly like hitting a rev limiter. Could any of you know the cause, or maybe some fixes i should try?

 

Check the bike isn't overcharging, 14.5v at the battery. Sounds like an electrical fault so be sure all wires are connected properly in the ignition circuit. Some bikes have a rev limier for reverse, so check if it has one and that it only works in reverse. An accident can jolt such items into coming on all the time. Can also be fuel filter not allowing enough through at high revs, or a loose baffle in exhaust partially blocking it.

 

So i found the problem, and i fixed it. The spark plug wasn't getting power because a wire was broken, fixed the wire, now it's working. Now i have a new problem, my dashboard lights up but doesn't display anything(digital dashboard), i'm thinking it may be the battery, what do you think?

 

If the starter can spin the engine over fast enough to start, it isn't the battery causing your display problem. Either another broken wire, or that jolt in the accident blew the circuit board in the display. Check the wires that go to the display and, if they are OK, get someone who can mend circuit boards to take a look at the display.