Backfire from exhaust

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,870
Start by opening your tool box.----Take cylinder head off.---Could be a blown head gasket.
 

Culpy14

Cadet
Joined
Mar 27, 2022
Messages
23
Powerpacks can be defective when they get hot like that. Just went through it on my evinrude and the carbs were dirty causing a lean condition, which through me way off on diagnostics.
 
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