88 mercury 115 i6 lost WOT

[sptjet90Reflexx]

28' pontoon with 88 mercury 115. 13p prop. Turning about 5500-5600 RPM with no issues. Ran fantastic.

Coming up lake Yesterday it just dropped like it lost gas. now it wont go over 4300 RPM. It revs up over 5500 without issues in N but not in F. I attempted to hit the electronic enricher while going and it tries to die so not sure if it is fuel related or not. I run 50:1 premix.

New plugs, wires, stator, top switchbox, regulator, fuel lines, shift and throttle cables. This is running on a 6gal mini tank.

Nothing sounds off at 4300 or so its almost like the throttle cable came loose or something..

 

[TexMonty]

Check al cylinders to see if they are all firing? In N it isn't under load like F. I would not be reving too high without a load.

 

[sptjet90Reflexx]

havent had a chance to get down to the dock with the spark tester yet. but I will.

 

[racerone]

Has the water pump been maintained ?----Need to do a compression test too.---Need to confirm that carburetors are clean and not leaking.---need to confirm that fuel pump diaphragm is not ruptured.---Does the primer bulb go hard when you operate it for start-up ?

 

[sptjet90Reflexx]

rebuilt carbs end of last season as well as water impeller. Compression last year was dead even across the board. I will check again. Also yes bulb is good.

 

[quicktach]

How are the gas filters? How's the cap/vent on the 6 gal mini tank?

 

[sptjet90Reflexx]

vent clear, and no fuel filter currently.

 

[sptjet90Reflexx]

I checked spark all looks well. I pulled back the throttle stop on it and I got a solid 51,5200 RPM. Still not at the 5500 it was previously. Looks like I might of got some dirt sucked in the carbs somehow.. I can see particles in the openings.