Took my 120hp chrysler out today for the first time to open it up. I have only been able to go on no-wake lakes so far so i was really excited to hit it hard today. Pushed off the dock, idled out for a few minutes and then pushed it wot. It sputtered for a while and pushed the nose way up. I had my grandfather with me so I had him steer while i sat up on the nose to try to get it to plane. After a bit of sputtering, it finally came up on plane. However, my max rpms, no matter what i did, were right around 4000. Pushed the boat (if my speedometer is correct) right around 25 - 30 mph. It is a 17 8" flat bottom V boat. I was expecting it to hit around 45- 55 mph pretty easily. I checked all the fuel lines, and change the spark plugs. I also ran a can of decarbonizer thru the motor. Took it out again this evening with the wife and kids and had the same exact problem,,, difference this time, I had more weight in the boat. It just doesnt seem to want to spin fast enough. I think i am flooding the motor out since it wont come up on plane on WOT. I did notice that when i turned the boat around to the left,,, if i turned it hard enough, the prop would slip and rev really high. I didnt get a chance to try it going to the right. Do i need to put a whale fin on the lower unit,,, or change pitch on the prop? I did take the prop off while i ran the decarbonizer thru it and it would rev as high as I could stand to let it go. Hopefully this is and easy fix,,, this project is wearing me out. Any help would be great. Thanks... It is a 17 pitch prop on it now.
