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Thread: 99 Johnson 225 HO Compression
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05-14-2015, 09:05 PM #1Member
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99 Johnson 225 HO Compression
What should the compression be on a 99 Johnson 225 HO? What psi would your consider low also on this motor? Did the compression between a standard 225 and 225 ho differ? Thanks alot for your help.
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05-15-2015, 11:34 AM #2Member
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All these OMC experts in here and no one can help me out with this.
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05-15-2015, 01:06 PM #37000 RPM
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I had a 99 200 which is the same block, i think mine were all at about 90-100 psi and with the 2.7 heads on it i gor 20 extra psi. Hope this helps
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05-16-2015, 02:35 PM #4
compression upgrade requires jet-change,3 up 3 down,one a the last yrs. 4 carbureted.