Ot101194
Motor planes out great and runs smoothly until 4800 rmps.then it starts to miss bad and won't go any higher or faster. Thoughts?
Ot101194
Motor planes out great and runs smoothly until 4800 rmps.then it starts to miss bad and won't go any higher or faster. Thoughts?
Inspected spark plugs and wires? What spark plugs are you running?
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
The ones you recommend.
Plugs are new. I'll check the wires.
Could they break down at high rpm?
I would recommend NGK: BPZ8HS-10. That's the ONLY approved plug, and must be gapped to .040".Originally Posted by TritonSteve
Plugs, wires or coils can easily break down at high RPM's (as can other ignition system components).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Thanks Don, that is the plugs I have.
Replacement wires is easy. Is there a way the test coils?
Yes- tests are outlined in the Mercury Service Manual.
Was this occurring prior to the spark plugs being changed?
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Yes
If I find a bad coil can I just replace the one that's bad
Last edited by TritonSteve; 03-25-2020 at 08:54 PM.
yes sir
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