233hp problem

willietrojan · Post by **willietrojan** » Sun Oct 26, 2008 9:10 pm

I twin 233hp Mercâ€™s, and I'm having a problem with starboard engine, it runs fine till it get to 3000RPM then it starts missing and bogging down . Once I slow it back down under 3000 it runs fine again. I have changed points, wires coil.
Any ideas?

prowlersfish · Post by **prowlersfish** » Sun Oct 26, 2008 9:28 pm

Fuel filter(s) would be my first guess. you may wany to check the pick up in the tank also . Did you use Mercury points or after markit ? I ran in to a case where the points rubbing block was in the wrong place on a set of macthed up points causeing the points to fire when the rotor was not lined up to the cap . ( threw off the timing also) . BTW it was on a F32 also .

jddens · Post by **jddens** » Sun Oct 26, 2008 10:20 pm

Yep, what prowlersfish said, fuel filter and or filter seperator.......out side chance it could be air restriction.....change filters and clean the backfire filter thing on the carb............

LandVF36 · Post by **LandVF36** » Sun Oct 26, 2008 11:29 pm

After you check out those things, next would be carbs. Around 3000 rpms, if you have 4 barrel carbs, they are probably opening up. If you are not getting fuel, and just more air, the mix is wrong and they could seems to stahl. Also, if the gas is not running through the jets right, and just out an over-flow port, it could do this as well. We don't all run our boats that fast often enough and the carbs get gummed up over time...

willietrojan · Post by **willietrojan** » Mon Oct 27, 2008 1:15 am

I think you all are on the right track, It has been awhile since I have
changed those filters. Let you know soon.

rick1954 · Post by **rick1954** » Tue Oct 28, 2008 7:10 am

Willie,
I have had the same problem with my 233hp aka 351 Ford I engin. I replaced the filters and just about everything that could be done, still had the same problem. I replaced the fuel pump and the problem went away, I can run the engin up to the max rpm without a sputter. The old fuel pump could not deliver the fuel needed at the elevated rpm.