99 Johnson 225 HO Compression

[PARKBOY]

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.

[PARKBOY]

All these OMC experts in here and no one can help me out with this.

[Gorilla0178]

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

[bigbore]

compression upgrade requires jet-change,3 up 3 down,one a the last yrs. 4 carbureted.