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My 77 polaris 340 colt ss has good spark on both cylinders but only runs on one cylinder.
Could it be a blown head gasket?
I never did a compression test but what else may it be?
 

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Change or swap the plugs first, if it has twin carbs it could be a fuel problem.
for the compression put in one plug at a time and pull it over you should be able to tell if one side has no compression.
 
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