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#12633738 - 02/18/18 07:42 AM Compression Numbers -- ???
flukeman83 Offline
Extreme Angler

Registered: 06/19/14
Posts: 1263
what are average -- good compression numbers for an 06 Mercury 225 Pro XS

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#12633830 - 02/18/18 08:56 AM Re: Compression Numbers -- ??? [Re: flukeman83]
grout-scout Offline
TFF Celebrity

Registered: 12/08/08
Posts: 7070
Loc: Boerne, Texas
I’m not a mechanic but I’ve seen several reports posted. I’ve read everything from 120-130 in reports, but you have to properly test them. Full charge battery, water running to the motor, engine control set in neutral with the throttle set to WOT and the kill switch pulled.

Biggest thing is to not have a big difference in the different cylinders.

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