Poor Performance at Low and Idle Speeds

1. Check ignition timing and valve-incorrect -

clearance

Correct

2. Check carburetor pilot screw -----Incorrect -

adjustment

Correct

3. Check if air is leaking past intake -Leaking---

pipe

Not Leaking

4. Perform a spark test ------Weak or Intermittent

Spark

Coolant level low

Fan motor not working

(faulty fan motor switch)

Thermostat stuck closed

Excessive carbon build-up on the piston head or combustion chamber

Use of improper quality fuel

Clutch slipping

Fuel-air mixture too lean

Worn piston and cylinder Fuel-air mixture too lean Use of improper quality fuel Excessive carbon build-up on the piston head or combustion chamber Ignition timing too advanced (Faulty ignition control module or ignition pulse generator)

■ Improper valve clearance

■ Improper ignition timing

(Faulty ignition control module or ignition pulse generator)

■ Fuel-air mixture too lean • Fuel-air mixture too rich

■ Deteriorated intake pipe O-ring

■ Loose carburetor

• Damaged intake pipe

• Faulty, carbon or wet fouled spark plug

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