Please excuse my lack of knowledge & terminology when I try to explain my problem, since I am still pretty new with boats. I have a 1994 115hp Johnson that is on the back of a 24' pontoon. I purchased this boat last year & have been trying to work out a few kinks. At the time, I noticed when I would accelerate to WOT (around 4000-4500 rpm's), the engine would suddenly "jar" & feel like it would hold back without gaining anymore speed. It is hard to explain, but when the engine hits a certain point at higher rpm's there is a that jolt & it almost feels like something is restricting the flow of fuel in the carbs?? Took the boat in when I had it winterized the end of last year & had the carbs cleaned & gone thru (thinking that this would fix the problem), but when I took it out the first time this year, it STILL does it. The funny thing is that the jolt & hesitation seems to only happen when the motor is trimmed down (with the bow pointed up). When it is vice versa, it seems to do just fine, but with my bow down in the water more, I am really plowing thru water & I only get 17 mph at 4500 rpms! Motor runs great at lower rpm's (regardless of how the trim is set) so I am very confused at what causes the motor to jar & holds back on me before I can get it to WOT??? Any help is greatly appreciated!
