| Problem |
Description |
Solution |
| Engine won’t start |
No crank or response when pressing the start button. |
Check battery voltage, kill switch, ignition switch, starter relay, and fuses. |
| Engine cranks but doesn’t start |
Engine turns over but fails to ignite. |
Check spark plug, fuel supply, inspect carburetor, and check compression. |
| No spark |
No spark at the spark plug when cranking the engine. |
Test CDI unit, ignition coil, stator, and inspect wiring and connections. |
| Weak or inconsistent spark |
Spark is weak or intermittent, causing rough operation. |
Replace spark plug, check ignition coil, test CDI, and verify ground connection. |
| Hard to start (hot or cold) |
Multiple attempts are required to start the engine. |
Clean carburetor, check choke system, inspect air filter and fuel lines. |
| Starts but stalls |
Engine starts but immediately shuts off. |
Inspect fuel flow, adjust idle screw, clean idle jet, and check vacuum lines. |
| Rough or unstable idle |
Engine idles irregularly or surges, often causing stalling. |
Clean idle jet, adjust idle screw, check for vacuum leaks in intake manifold. |
| Poor acceleration or sluggish power |
Engine bogs down or performs poorly when accelerating. |
Clean air filter, inspect throttle cable, clean carburetor jets, and check fuel system. |
| Backfiring (intake or exhaust) |
Popping or backfiring sound during acceleration or deceleration. |
Check air/fuel mixture, inspect for intake/exhaust leaks, adjust carburetor. |
| Overheating |
Engine runs too hot or the cooling fan fails to activate. |
Inspect cooling fan, radiator, coolant level, thermostat, 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 mixture. White: Inspect for blown head gasket. |
| CVT slipping |
Engine revs high, but the vehicle accelerates poorly. |
Inspect CVT belt, clean clutch sheaves, adjust or replace the belt. |
| Transmission won’t shift smoothly |
Gears are hard to engage or shift roughly. |
Check shift linkage, inspect clutch system, check fluid levels and condition. |
| Grinding noise when shifting |
Loud grinding sound during gear changes. |
Check CVT sheave condition, belt deflection, and clutch operation. |
| Battery drains quickly |
Battery loses charge even after riding for extended periods. |
Test stator output, inspect regulator/rectifier, check battery health. |
| Starter motor not working |
Starter motor doesn’t turn or cranks slowly. |
Check battery voltage, test starter solenoid and motor, inspect cables. |
| Electrical issues |
Lights, fan, or display malfunction. |
Inspect fuses, relays, switches, and wiring harness for faults or corrosion. |
| 4WD system not engaging |
Front wheels do not engage when switching to 4WD. |
Check 4WD actuator, 4WD switch, inspect front differential and related wiring. |
| Fuel leak |
Smell of fuel or visible fuel leakage from the carburetor or fuel lines. |
Inspect fuel lines, tank seals, carb overflow, and petcock. |
| Spongy or weak brakes |
Brake pedal or lever feels soft or weak, poor braking performance. |
Bleed brake lines, check brake fluid level, inspect brake pads, check for leaks. |
| Brake noise |
Squealing or grinding noise during braking. |
Replace worn brake pads, clean rotors, check for debris or warped components. |
| Excessive vibration or rattling |
Unusual shaking, rattling, or noise during riding. |
Inspect engine mounts, driveshafts, suspension, and check for loose bolts or parts. |
| Steering pulls to one side |
ATV veers to the left or right during riding. |
Check tire pressure, alignment, steering linkage, and suspension. |
| Suspension feels harsh or noisy |
Rough ride, squeaking, or knocking sounds when riding over bumps. |
Grease suspension pivots, inspect shock absorbers, and replace worn bushings. |
| Cooling fan not operating |
Engine overheats, and the fan does not turn on. |
Test fan motor, temperature sensor, fan relay, and wiring connections. |
| Transmission fluid leak |
Transmission fluid leakage from the differential area. |
Inspect seals, drain plugs, and gaskets for leaks. |
