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Have a Friend who's 150 Johnson won't run right.  Seems to miss fire over 3500 rpms but not consistent.  Also runs well in between misses and under 3500.

Went for a ride and when pushed higher engine really sounded bad (maybe have backfired).   Pulled back and ran well again at 3200.


What are the thermostats set at for this 60 degree engine seems to run hot even with new ones in.
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Hello sounds like bad pack and can be verified with timing light on each cylinder and watch for intermittent flashing.

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