Polaris Hawkeye Repair Manual page 83

Low Compression
• Decompressor stuck
• Cylinder head gasket leak
• No valve clearance or incorrectly adjusted
• Cylinder or piston worn
• Piston rings worn, leaking, broken, or sticking
• Bent valve or stuck valve
• Valve spring broken or weak
• Valve not seating properly (bent or carbon
accumulated on valve area)
• Rocker arm sticking
Backfiring
• ETC or speed limiter system malfunction
• Fouled spark plug or incorrect plug or plug gap
• Carburetion faulty - lean condition
• Intake / Exhaust system air leaks
• Ignition system faulty:
•Spark plug cap cracked/broken
•Ignition coil faulty
•Ignition or kill switch circuit faulty
•Ignition timing incorrect
•Sheared flywheel key
• Poor connections in ignition system
• System wiring wet
• Cam lobe worn or Valve sticking
• Lean condition
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ENGINE
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