Tracker Off-Road 800SX Service Manual page 102

Problem: Engine idles poorly
Condition
1. Valve clearance out of adjustment
2. Valve seating poor
3. Valve guides defective
4. Fuel injector obstructed
Problem: Engine runs poorly at high speed
Condition
1. Valve springs weak
2. Valves mistimed
3. Cams worn
4. Air cleaner element obstructed
5. Fuel hose obstructed
6. Ignition coil defective
Problem: Exhaust smoke dirty or heavy
Condition
1. Oil (in the engine) overfilled — contaminated
2. Piston rings — cylinder worn
3. Valve guides worn
4. Cylinder wall scored — scuffed
5. Valve stems worn
6. Stem seals defective
7. Air cleaner element obstructed
Problem: Engine lacks power
Condition
1. Valve clearance incorrect
2. Valve springs weak
3. Valves mistimed
4. Piston ring(s) — cylinder worn
5. Valve seating poor
6. Cams worn
7. Air cleaner element obstructed
8. Oil (in the engine) overfilled — contaminated
Problem: Engine overheats
Condition
1. Air filter restricted
2. Oil low
3. Fuel incorrect
4. Oil pump defective
5. Oil circuit obstructed
6. Coolant level low
7. Fan malfunctioning
8. Fan switch malfunctioning
9. Thermostat stuck — closed
10. Radiator hoses — cap damaged — obstructed
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Remedy
1. Adjust clearance
2. Replace — service seats — valves
3. Replace guides
4. Replace fuel injector
Remedy
1. Replace springs
2. Re-time valves
3. Replace cams
4. Clean — replace element
5. Clean — replace hose
6. Replace ignition coil
Remedy
1. Drain excess oil — replace oil
2. Replace — service rings — cylinder
3. Replace guides
4. Replace — bore engine block
5. Replace valves
6. Replace seals
7. Clean — replace element
Remedy
1. Adjust clearance
2. Replace springs
3. Re-time valves
4. Replace — service rings — engine block
5. Repair seats
6. Replace cams
7. Clean element
8. Drain excess oil — change oil
Remedy
1. Clean — replace air filter
2. Add oil
3. Drain — replace fuel
4. Replace pump
5. Clean circuit
6. Fill — examine system for leaks
7. Check fan fuse — replace fan
8. Replace fan switch
9. Replace thermostat
10. Clear obstruction — replace hoses