I’m not a boat mechanic. However, considering the age of the motor I recorded a compression reading of 74, 74, and 71. My process was to pull the kill switch and test each chamber, pulling out one spark plug at a time.
What would you deduce from this reading?
2016 Falcon F215 - 2016 Mercury Pro XS OptiMax
Repost down on the Mercury form and let one of the motor pro's help.
Try another tester, would never expect such consistent, low readings. Warm motor before, throttle @ WOT.
all plugs out? warmed up and throttle wide open during test? seems to low to be a good running motor if it even runs at all?
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
do a decarb with mercury deep clean,the cleaner that sits in it over night and recheck it
Pull all the plugs and open the throttle. those are low numbers. Make sure your battery is charged and healthy.
What Gatchmo5710 said
Reply With Quote