| Problem |
Description |
Solution |
| Engine won’t start |
No crank or response when pressing the starter button. |
Check the battery charge, kill switch, ignition switch, starter relay, and fuses. |
| Engine cranks but doesn’t start |
Engine turns over but does not fire or ignite. |
Check spark plug, fuel delivery, clean carburetor/injector, and inspect compression. |
| No spark |
No spark at the spark plug during cranking. |
Test the ignition coil, CDI unit, stator, and inspect wiring connections. |
| Weak or intermittent spark |
Spark is weak or intermittent. |
Replace spark plug, inspect ignition coil, test CDI, check ground connection. |
| Hard to start (cold or hot) |
Multiple attempts needed to start the engine, or throttle manipulation required. |
Clean carburetor, inspect choke system, check air filter, and fuel lines. |
| Starts but stalls |
Engine starts but shuts off shortly after. |
Check fuel flow, clean idle jet, adjust idle screw, check vacuum lines. |
| Rough or unstable idle |
Engine surges, idles erratically, or stalls at idle. |
Clean the idle jet, adjust the idle screw, check for vacuum leaks in intake manifold. |
| Poor acceleration or sluggish power |
Engine bogs down or does not accelerate as expected. |
Clean air filter, inspect throttle cable, adjust carburetor, clean jets. |
| Backfiring (intake or exhaust) |
Popping or backfiring sounds during acceleration or deceleration. |
Inspect intake and exhaust leaks, adjust carburetor, and check for exhaust leaks. |
| Overheating |
Engine temperature rises excessively, and cooling fan doesn’t activate. |
Inspect radiator, coolant level, cooling fan, thermostat, and oil level. |
| Excessive exhaust smoke |
Blue (oil burning), black (rich mixture), or white smoke (coolant burning). |
Blue: Replace valve seals or piston rings. Black: Adjust carburetor mixture. White: Inspect head gasket. |
| CVT slipping |
Engine revs but there is poor or delayed acceleration. |
Inspect CVT belt, clean clutch sheaves, replace belt or adjust tension. |
| Transmission won’t shift smoothly |
Gears are hard to engage or shift roughly. |
Check shift linkage, clutch operation, and fluid levels. |
| Grinding noise when shifting |
Grinding sound when shifting gears. |
Inspect CVT belt, sheave condition, and clutch operation. |
| Battery drains quickly |
Battery loses charge rapidly after use. |
Test stator output, inspect regulator/rectifier, and check battery condition. |
| Starter motor not working |
Starter motor does not turn or operates slowly. |
Check battery voltage, test starter solenoid, inspect wiring and motor. |
| Electrical issues |
Lights, fan, or display malfunctioning. |
Inspect fuses, relays, and wiring for faults or corrosion. |
| 4WD system not engaging |
Front wheels fail to engage when switching to 4WD. |
Check 4WD actuator, 4WD switch, inspect front differential and wiring. |
| Fuel leak |
Fuel smell or visible fuel leakage from carburetor or fuel lines. |
Inspect fuel lines, carb overflow, tank seals, and petcock. |
| Spongy or weak brakes |
Brake pedal or lever feels soft or weak, with poor braking performance. |
Bleed brake lines, check brake fluid levels, inspect brake pads for wear. |
| Brake noise |
Squealing or grinding noise when braking. |
Replace worn brake pads, clean rotors, check for debris or warped components. |
| Excessive vibration or rattling |
Unusual shaking or noise during riding. |
Inspect engine mounts, driveshafts, suspension, and tire condition. |
| Steering pulls to one side |
ATV veers left or right during riding. |
Check tire pressure, suspension alignment, and brake drag. |
| Suspension feels harsh or noisy |
Rough ride or squeaking sounds when riding over bumps. |
Grease suspension pivots, inspect shock absorbers, replace worn bushings. |
| Cooling fan not operating |
Engine overheats due to the fan not turning on. |
Test fan motor, temperature sensor, fan relay, and check wiring connections. |
| Transmission fluid leak |
Transmission fluid leaking from the differential area. |
Inspect seals, drain plugs, gaskets, and transmission fluid levels. |
| Clutch not disengaging |
Clutch doesn’t disengage properly, causing ATV to creep. |
Check clutch adjustment, inspect clutch components and cable. |
| Poor throttle response |
Throttle feels unresponsive or sluggish. |
Check throttle cable, carburetor adjustments, and inspect air intake system. |
