RTO ATVs - Recent Questions, Troubleshooting & Support

your carbs could need cleaning and adjusted.

I have a 87 quadrunner 300 how do I adjust the valves it has 4 2 on intake and 2on exhaust

There are several places you can go on the web that have free atv repair/owners manuals. The owners manuals usually have a wiring schematic on or towards the last page also trouble shooting diagrams with instruction in them.Type in your search bar: atv polaris (year) model:trailblazer/500cc.If you like email: [email protected] with specs and I will email it to you.Hope this was helpfulTry2B8me

Sometimes you need to adjust your clutch cable. as the disks wear out you have to tighten it to get it to disengage. if the cable is adjusted too tight then it will slip because it is not taking all the pressure off the disks so they can fully grab. That is where i would start

If it turns over fast it is not the battery or charging system. If it turns over fast but does not like to start when motor is warm it is probably running rich. If it ran good before and the carb has not been messed with i would check the air filter. It needs to be nice and clean.

stater, cdi,ignition coil

Most probably it's the fan relay.

if the o2 sensor is still in the pipes , it is ok if not have the adaptor fitted to the pipes and it will be ok the sensor reports the gas composition to the ECM to adjust the air/fuel mixture if the new pipes are pollution control compliant the adaptor should be already there if they are not then you are achieving nothing with the different pipes but are actually decreasing fuel economy

china is junk, why its so cheap. contact your state attorney general.

bad head gasket

is the reverse lockout cable working right?

1 thin wire in, one big fat wire to the spark plug. its not rocket science.

If its a 2 stoke,"takes gas oil mix", piston in backwards,, ,,,,if its a 4 stroke "takes gas only"...rocker arms need adjusted, or cam not set in proper place during resembly "out of time". Or a. Bent valve/valves,,,in the head, valve will have to be replaced

ebay most likely.

You need to first determine whether the problem is fuel or electrical. Remove the sparkplug and pour in a small quantity of gas. Replace sparkplug and high tension lead. Crank it over. If it does start and run a bit then your problem is fuel and not electrical. If it does not fire and the sparkplug is wet, then start be replacing the sparkplug with a new one.

I would not think so check for broken wiring, kill switch and dirty terminals and connections

change the air filter. check float level id carby turn choke off