93 model motor. Has 4 plugs so guess it has 4 cyl.
Compression on one cyl. is down to 40psi and boat misses.
Starts fine then misses seems to run fine at 1/2 to full throttle. But you have to use the choke to get it to take off without dying pushing it in give some throttle push again and get to moving and then it takes on off. What do i do? Is this a problem i can fix myself with the help of a good book. I figure it has broken rings if losing compression. But although i can fix about anything on a vehicle this is different. What do you fella's think. I have changed all fuel lined from the bulb up. Still does this. HELP HELP HELP PLEASE

Problem is the compression. Once you are able to get the rpm's up, that is covering up the miss. Eventually, it won't idle at all. Time for an overhaul. Not a good idea to do just one cylinder. If you are not a real good mechanic, than its best to have a pro do it.

I've been around a lot of OMC brand 150's and up and never seen one with 4 cylinders they are a V-6 so are you sure it's a 150 or that it only has 4 cylinders? How many carbs does it have? a 4 cylinder will only have 2 and a V-6 will have 3.

120hp I'm betting...

Their were 140hp 4 cylinder outboards then.