20 Most Recent RTO 200cc Full Size Four Wheeler ATV - Page 6 Questions & Answers

There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark.

Good luck and rate this solution, please.

clogged fuel flow. check the tank filter, petcock, lines and then the carb bowl float.

check cable, spark plug, spark plug cap for good resistance levels. then check the coil. easy fix.

is it getting spark? did you check the compression?

plug, cable, plug cap, coil, pickup coil in the stator.

if its turning over u may need to open and close the throtle a few times if its jus clickin u need to check the starter and sylenoid

find the carb and there will be a pipe where you connect it to ! P....

you should have a serial code on it and within the letters and numbers it will have a kind that it is. research the numbers on line

How many blinks on the 1st gear light? Here's the code definitions that should be for your quad. Count the flashes and look it up here. Call your dealership or local repair shop for more info and parts if you're planning on tackling it yourself. Code 0 (no flashes) - The system is functioning normally Code 1 (one flash) - Electronic control unit Code 2 (two flashes) - Shift Switch or it's circuit Code 3 (three flashes) - Angle sensor or it's circuit Code 4 (four flashes) - Gear position switch or it's circuit Code 5 (five flashes) - ECU motor circuit (defective ECU) Code 6 (six flashes) - ECU failsafe relay circuit (defective ECU) Code 7 (seven flashes) - ECU voltage converter circuit (defective ECU) Code 8 (eight flashes) - Angle sensor, control motor, ECU or circuit Code 9 (nine flashes) - Angle sensor, it's circuit or ECU Code 10 (ten flashes) - Pulse generator or it's circuit Code 11 (eleven flashes) - Speed Sensor , it's circuit or ECU Code 12 (twelve flashes) - Gear position switch, it's circuit or ECU I hope this helps you out.

every four wheeler I've ever worked on has the ignition timing fixed and controlled by the CDI. Mechanical timing usually invovles lining up the T on the flywheel with a mark on the cam shaft. you'll need a service manual for more specifics.

My first check would be the condition of the chain and sprockets. Check to make sure all of the teeth are still ok and if the tension of the chain is correct and that it is well lubed.If the noise is more pronounced from the rear and chain and sprockets are ok, it could be the differential that has either failed bearings or damaged gears.

your going to need a magnet on a flexible shaft and lots and lots of patience , get a chair you will need it. Only one other thing I can say is if that doesnt work., the cylinder head needs to come off.

Who cares!! A title on a vehicle that small can't be worth much. Move on.

Try cleaning the spark plug with fine grit sandpaper,make sure air filters is cleaned,then make sure carb is cleaned pilot or idle jet might be clogged. good luck

then the carburetor jets are cloged up. take it apart and do a good cleaning on it.

that is just a hand primer for when you run out of fuel. you may need to change the fuel filter. and clean out the fuel chamber and veins in the carb. if filter is old 2 years then it should be changed.

Suspect rings or blown head gasket. Do a compression test. Look at the oil. Milky? Look at the water. Oily?

Hi Shawn, Check the ignition timing and inlet manifold gaskets and all vacuum hose connections. If all is okay carry out a compression test, looking specifically for burned valves, but timing would seem to be the likely problem. Regards John