Tohatsu M 25 C Running Rough

[zbitner82]

I have a mid 80's Tohatsu 25 HP tiller outboard that I was using for duck hunting this winter. I had it out many times and it ran like a top. One day we were coming in from duck hunting and right at the boat ramp I hit some mud and the motor died. I was unable to get it started again. I thought I flooded it so I took it home and let it sit for a day or two. I tried to start it again and could not get it to stay running. I tinkered with it for 2 hours and then I replaced the plugs. (I proly should have done that first) After replacing the plugs it would run, but only if I had the throttle wide open. Even then it runs very rough, it cuts in and out. If I throttle down to shift it in to gear, it dies 8 out of 10 times.

It seems weird to me because it ran so good and then all of the sudden it just quit. Any ideas would be a big help!! The numbers on the motor are M 25 C and 372 71829 if that helps at all. Thanks!

M 25 C
372 71829

 

[RadarRick]

Re: Tohatsu M 25 C Running Rough

At first glance, sounds like fouled carb. However, the shock of hitting bottom could have damaged something. I'd also check the water pump & cooling system in case mud has damaged or plugged it up.

 

[zbitner82]

Re: Tohatsu M 25 C Running Rough

Thanks for the quick responce! I thought the same thing about the water pump or something along those lines. When I did get it started it was pumping good clean water and that end of it seemed to be okay. I think I am going to take it to someone here localy to get it worked on! Sound like it is over my head!

I love the site....you guys do a great job!!

 

[pvanv]

Re: Tohatsu M 25 C Running Rough

Does sound fuel related. But... it really needs to be properly diagnosed. Your shock/impact may have dislodged some crud in the fuel system, or you may have done something else. Only a proper diagnosis will really tell.