Quote:
Originally Posted by THEFERMANATOR
I do as well, but sometimes they reccomended both styles, one was for general use, and the other for sustaned high rpm runs. Omc used to do this with the ql77jc4 gapped plug for general use, or the ql7iyc which had an extended electrode for sustained high rpm use. They worked great if you were running 5K+, but idlefor 5 minutes trolling and they were all fouled. Put ql77jc4's in and no more fouling.
Or how the early 80's cross flow omc outboards origanally used surface gap plugs, but omc changed there reccomendation in the 90's due to fuel changes, and now they call for a gapped ql77jc4 unless it's on a performance boat in which case you can still run the surface gap plugs to minimize detonation.
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Yep. Completely agree. That's why I said "given the choice go with the gapped". I've had more than one set of surface gapped plugs foul up on me.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
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