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Compression Numbers -- ??? #12633738 02/18/18 01:42 PM
Joined: Jun 2014
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DBFishing83 Offline OP
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what are average -- good compression numbers for an 06 Mercury 225 Pro XS

Re: Compression Numbers -- ??? [Re: DBFishing83] #12633830 02/18/18 02:56 PM
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grout-scout Offline
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Im not a mechanic but Ive seen several reports posted. Ive 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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