6-7-06 - Fifth Proof
5-7
Troubleshooting
• Idle speed adjusting screw
improperly set. • See engine manual.
• Idle fuel adjusting needle
improperly set (some
models).
• See engine manual.
• Low compression. • See engine manual.
• Restricted fuel tank cap vent. • Open vent on fuel tank cap.
• Engine overheated-cooling
system/air circulation
problem.
• Clean cooling fins and
remove any debris from
around engine.
Engine Overheats • Air intake/grass screen,
cooling fins, or cooling
shrouds clogged.
• Clean cooling fins and
remove any debris from
around engine.
• Excessive engine load. • Reduce load on engine.
• Low crankcase oil level. • Add engine oil.
• High crankcase oil level. • Drain engine oil and replace
with proper quantity.
• Faulty carburetor. • See engine manual.
• Lean fuel mixture. • See engine manual.
•SMART-SPARK™
malfunction (applicable
models).
• See engine manual.
Engine Knocks • Excessive engine load. • Reduce engine load.
• Low crankcase oil level. • Add engine oil.
• Old or improper fuel. • Drain fuel system and
replace with fresh, clean fuel.
• Internal wear or damage. • See engine manual.
• Hydraulic lifter malfunction. • See engine manual.
• Quality of fuel. • Drain fuel system and
replace with fresh, clean fuel.
• Incorrect grade of oil. • Drain engine oil and replace
with proper grade of oil.
Problem Possible Causes Corrective Action