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incorrect air fuel mixture or a leak check for damage to the intake boot or airbox
i need to know more about how its running at low mid and high rpm to help you troubleshoot and you need to check for leaks especiely the intake boot if the intake boot is leaking that will need to be fixed before running the bike asumeing that is ok or fixed run the bike listen to it at idle standing is it surgeing with a good fast acceleration off the line with you siting on the quad ? or just realy rough ticking over with little guts off the line ?
midrange rideing how does it feel is there a bwarrr noise as u accelorate hard or does the engine roar up fast
is it reaching a good top end with good pulling power or poor pulling power
are the backfires constant or mainly whyle slowing down from high revs
if all are effected but there are no leaks then it may be float / fuel level that needs ajustment fuel level in ur float bowel effects all stages of rpm low mid and high
A rich problem gets worse as the engine heats up.
A lean problem gets better as the engine heats up.
hope this helps if u dont fix it your self first try and do them little rpm backfire tests for me itl tell me a lot
Most bikes are in the 1000rpm range unles they are 2 stroke (some small Aprillas etc.), dont always go by the tacho meter, you can usually hear if the bike is idling too high or too low and idle adjustment is usually fairly easy once you find the adjuster screw.
Initially, remove the sparkplugs, note and postback the colors of the tip.
Almost always, idling problem is a carb issue (air/fuel mix & amount), On the otherhand, refusing to accelerate past a certain speed (or more particularly, a certain RPM while under load) indicates an air leak. Test drive the bike again and note where it starts to fail to accelerate, consistently on 35MPH or a particular RPM.
The filter is located on the fuel line half way between the tank and carbs (if it has one as some bikes don't) The Rpm's at idle should be around 900 but can be a little higher or lower for better sound or performance.