3B015517
77.7 Hours
On The water this morning- for the initial start and starts for the entire morning - motor sounded irregular/faint and took slightly 1-2 secs longer to kick over. Idle speed was irregular as well with the outboard displaying minor shaking. Motor ran fine wide open. No tripped faults on vessel view. Maintenance up to date.
Any ideas or suggestions appreciated.
Cal
likely needs spark plugs -- still original ones?
2022 z519 cup 225 merc 4s ser # 3B210484. 2--hds12 live units. 2 poles, atlas plate, ghost, hamby's, active target, merc digital gauges
2002 basscat pantera 3 (dad bought new) sold 8-2-22
2000 stratos 20 ss (bought new) 200 hp Rude ficht great boat/motor sold 11-21
pulled by a 2500HD Denali will all the BANKS upgrades
MAGA 45-47
ASE/GM Master tech before tools
Yes, original plugs.
Originally Posted by mactlman
I agree, I did mine on my 300r at around 110 hours.......the plugs looked perfect, gap was perfect, but motor ran noticeably crisper and idled even rpms in gear after changing them. Keep in mind the 300 hr service is 300hrs or every 3 years. Fuel quality might also be an issue for you if you're only doing 25 hours per year. Do you run the motor hard ever?
Run her hard— but for short/moderate stretches. I too suspected sub-par gas quality.
I’m also using the recommended additives each time. When starting her up you can definitely tell something is off.
Plugs (replace) and gap properly. Definitely due.
If it still "sounds" different when initially starting, check the idle relief muffler tube.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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Will do - thank you
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