50 HP Force will not rev-up

[chet34]

Last weekend we were out on our boat and it was running great, when twords the end of the day the motor would only rev up to mabey 1500 RPM (I am just guessing here there is no tach.) the motor still sounded good not missing or anything just would not rev like it should. We left the lake and headed home when I looked everything over the only problem I could find is that we were basically out of gas, I filled it up put the muffs on it and ran it in the driveway. It sounded great reved up like it should and everything. Went back to the lake this weekend and had the same problem from the start (will not rev past 1500RPM or so) So I realised that when I am in neutral the motor revs all the way up no problem but in forward or reverse in the water it will not. I pulled the plugs and they are not fouled out. I have no idea where to look anyone have any ideas?<br />Thanks in advance.

 

[page62]

Re: 50 HP Force will not rev-up

Possibly a fuel blockage. Your carb may be dirty. Try a can of B12, but you should really consider rebuilding it.

 

[ChalkBoy]

Re: 50 HP Force will not rev-up

Check the ventilation of the gas tank. If your primer bulb is collapsed, you may have created a suction.

 

[russbyers]

Re: 50 HP Force will not rev-up

I believe that you are having the same problem that I am.
I was told that the carb needed rebuilding.
Haven't done that in many years, but I'm willing to try it.
Looks like a fairly simple carb.
Kit is around $20.00. Let me know how that turns out.
1994 50hp Force, Model 507A9B