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- Possible Causes
- __ Loose spark plugs
- __ Sticking contact points
- __ Broken spark advance rod
- __ Broken throttle rod
- __ Defective cylinder head gasket
- __ Loose head
- __ Leaky valves (regrind)
- __ Warped valve heads
- __ Piston ring joints in line
- __ Worn piston rings
- __ Cracked piston or cylinder head (rare)
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