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Old 10-19-2018, 02:18 PM   #42
Bob C
Senior Member
Join Date: May 2010
Location: So Cal
Posts: 6,405
Default Re: Terriable backfiring

I wonder if you have a leaking exhaust valve that is letting raw gas into
the exhaust system when the piston is coming up on compression. I would do a leak down test to see where the compression on #3 is going.

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