Looking at a used boat at a dealership, what compression should a 2020 225 HP Pro XS Four stroke have on each cylinder?
Looking at a used boat at a dealership, what compression should a 2020 225 HP Pro XS Four stroke have on each cylinder?
Last edited by MikeBelter; 01-23-2023 at 09:42 AM.
Compression is almost never used with these engines due to the Smart-Start system. LEAKDOWN testing is a far more accurate measure of the health of a bore/cylinder.
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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).
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Sorry, I would provide the serial number but since it was a used boat I was looking at and not my own I didn't know what the serial number was. So what should I be looking for when I ask for a leakdown test?
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
proud dad of an ARMY Captain
MAGA
ASE/GM Master tech before tools
10% would be the outside edge. Personally- I wouldn't even consider buying a used engine (expecting to use it for long-term) if the leakdown exceeds 5%.
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
Last edited by mactlman; 01-25-2023 at 07:29 PM.
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
proud dad of an ARMY Captain
MAGA
ASE/GM Master tech before tools
Thank you, that is good to know!