Honda 45 stalls when accelerating

[Montauk123]

Hi, i just joined this Honda forum. Am hoping someone can help. I have an early 1990's Honda BF45A outboard (45 hp 4 cycle). Engine is in good shape, but continually suffers this same problem. It idles fine. But when give it throttle, it starts to lose power and stalls around 2000-2500 RPM. If am lucky, it keeps running/missing and once gets to 3000 RPM, then it runs perfectly again, smoothly powering up to 5500 RPM. It sounded like mid-speed carb jets clogged to me. So have rebuilt the three carbs twice so far, cleaned the fuel lines, changed all filters, new gas, ethanol treatment, etc. But still have same problem. I'm starting to think this may not be a carb problem at all (maybe electrical?) Squeezing the fuel bulb doesn't seem to help. Anyone have similar problem? Any ideas would be most appreciated. Thanks

 

[hondadude]

One thing you could try is to turn the idle mixture screw in each carb counterclockwise about a 1/4 turn. See if that makes any difference.

If that does not help....

The slow speed jets also help with transition. There are pin sized holes inside the carburator barrel in the top of the rear of the carb. There are some infront of and behind the edge of the butterfly when it it closed.

With the carbs off. Remove the long skinny tube (idle jet), have the idle mixture screw in a little (not the normal setting) and put the long skinny tube from a can of brake clean up into where the idle jet goes in the upper part of the carburator....spray and what what kind of spray comes out of the holes. All of the holes should have a nice even spray. If not, you have some cleaning of passages to do.

If you have not vacuum balanced your carburators, that could be part of the problem also.

Mike