| Problem |
Description |
Solution |
| Engine won’t start |
No crank or response when pressing the starter button. |
Check battery charge, kill switch, ignition switch, starter relay, and fuses. |
| Engine cranks but doesn’t start |
Engine turns over but doesn’t fire or ignite. |
Check spark plug, fuel delivery, clean carburetor, inspect compression. |
| No spark |
No spark at the spark plug during cranking. |
Test 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) |
Engine requires multiple attempts to start, or throttle manipulation required. |
Clean carburetor, inspect choke system, check air filter, and fuel lines. |
| Starts but stalls |
Engine starts but stalls shortly after starting. |
Check fuel flow, clean idle jet, adjust idle screw, check vacuum lines. |
| Rough or unstable idle |
Engine idles erratically, surges, or stalls at idle. |
Clean idle jet, adjust 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 sound from carburetor or exhaust during operation. |
Inspect for intake/exhaust leaks, adjust air/fuel mixture, clean carburetor. |
| Overheating |
Engine temperature rises too high or cooling fan doesn’t activate. |
Check radiator, cooling fan, coolant level, thermostat, and oil level. |
| Excessive exhaust smoke |
Blue smoke (oil burning), black smoke (rich mixture), or white smoke (coolant). |
Blue: Replace valve seals or piston rings. Black: Adjust carburetor mixture. White: Inspect head gasket. |
| CVT slipping |
Engine revs high, but there is poor or delayed acceleration. |
Inspect CVT belt, clean clutch sheaves, replace belt or adjust tension. |
| Transmission issues |
Difficult to shift, or transmission doesn’t engage smoothly. |
Check shift linkage, inspect clutch system, and check fluid levels and conditions. |
| Grinding noise when shifting |
Grinding noise when shifting gears or engaging transmission. |
Inspect CVT belt, sheave condition, and clutch operation. |
| Battery drains quickly |
Battery loses charge rapidly after use. |
Test stator output, inspect regulator/rectifier, check battery condition. |
| Starter motor not working |
Starter motor does not turn or cranks slowly. |
Check battery voltage, test starter solenoid, inspect wiring and motor. |
| Electrical issues |
Lights, fan, or display malfunction. |
Inspect fuses, relays, and wiring harness for faults or damage. |
| Fuel leak |
Fuel smell or visible fuel leakage around the carburetor or fuel tank. |
Inspect fuel lines, fuel tank seals, carb overflow, and petcock. |
| Spongy or weak brakes |
Brake pedal or lever feels soft or weak, with poor stopping power. |
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, and check for 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 when riding over bumps. |
Grease suspension pivots, inspect shock absorbers, replace worn bushings. |
| Cooling fan not operating |
Engine overheats and the fan fails to activate. |
Test fan motor, temperature sensor, relay, and wiring connections. |
