| Problem |
Description |
Solution |
| Engine won’t start |
No crank or response when pressing the starter button. |
Check battery voltage, ignition switch, kill switch, starter relay, and fuses. |
| Engine cranks but doesn’t start |
Engine turns over but does not fire. |
Check spark plug, fuel supply, inspect carburetor, and check compression. |
| No spark |
No spark at the spark plug. |
Test ignition coil, CDI unit, stator, and inspect wiring connections. |
| Weak or inconsistent spark |
Spark is faint or intermittent. |
Replace spark plug, inspect ignition coil, and check CDI unit and wiring. |
| Hard to start (cold or hot) |
Multiple attempts needed to start, or throttle manipulation required. |
Clean carburetor, check choke system, inspect air filter, and fuel lines. |
| Starts but stalls |
Engine starts but shuts off shortly after. |
Check idle screw, clean idle jet, check for fuel flow, and inspect vacuum lines. |
| Rough or unstable idle |
Engine surges, idles unevenly, or stalls at idle. |
Adjust idle speed, clean pilot circuit, inspect intake manifold for leaks. |
| Poor acceleration or sluggish power |
Engine bogs down or does not accelerate as expected. |
Clean air filter, inspect throttle cable, adjust carburetor, and clean jets. |
| Backfiring (intake or exhaust) |
Popping or backfiring sound from exhaust or carburetor during deceleration or throttle input. |
Check for air leaks, adjust air/fuel mixture, inspect exhaust system for leaks. |
| Overheating |
Engine runs excessively hot, or fan doesn’t activate. |
Inspect fan motor, radiator, thermostat, coolant level, and oil level. |
| Excessive exhaust smoke |
Blue smoke (oil burning), black smoke (rich fuel mixture), or white smoke (coolant). |
Blue: Replace valve seals or piston rings. Black: Adjust carburetor settings. White: Check for head gasket failure. |
| CVT slipping |
Engine revs high, but there is poor or delayed acceleration. |
Inspect CVT belt, clean clutch sheaves, check for worn belt, and adjust belt tension. |
| Transmission issues |
Transmission doesn’t engage, or it shifts roughly. |
Check transmission fluid level, inspect clutch system, and check shift linkage. |
| Grinding noise when shifting |
Loud grinding sound during gear engagement. |
Inspect CVT sheave condition, belt deflection, and clutch operation. |
| Battery draining quickly |
Battery loses charge too quickly, even while riding. |
Check stator output, inspect regulator/rectifier, and test battery. |
| Starter motor not working |
Starter doesn’t turn over or operates slowly. |
Test starter motor, check solenoid, inspect battery and connections. |
| Electrical issues |
Lights, fan, or dash malfunction. |
Inspect fuses, relays, and wiring harness for corrosion or damage. |
| 4WD system not engaging |
4WD switch doesn’t activate, or front wheels don’t engage. |
Test 4WD actuator, 4WD switch, and wiring; check front differential engagement. |
| Fuel leak |
Fuel smell or visible fuel leaks around carburetor or fuel tank. |
Inspect fuel lines, tank seals, petcock, carb overflow, and connections. |
| Spongy or weak brakes |
Brake pedal or lever feels soft or weak. |
Bleed brake lines, check fluid levels, inspect brake pads, and check for leaks. |
| Brake noise |
High-pitched squeal or grinding noise when braking. |
Replace worn brake pads, clean rotors, and inspect for warped or damaged components. |
| Excessive vibration or rattling |
Unusual shaking or noise when riding. |
Inspect engine mounts, driveshafts, tires, and suspension components. |
| Steering pulls to one side |
ATV pulls to one side or veers off during riding. |
Check tire pressure, alignment, suspension, and brake drag. |
| Suspension feels harsh or noisy |
Rough ride, squeaking, or knocking sounds from suspension. |
Grease suspension pivots, inspect shock absorbers, and replace worn bushings. |
| Fan not turning on |
Cooling fan fails to engage, leading to overheating. |
Check fan motor, temperature sensor, fan relay, and related wiring. |
| Transmission fluid leak |
Fluid dripping from the transmission area. |
Inspect seals, drain plugs, and gaskets for leaks. |
