RPM problem

[shakedown]

The problem is when boat hits RPM's above 3500-4500 it wants to cut out, I can run it no problem as long as it does not go over that. (things I have done), cleaned and switched out fuel selector valves, put all new fuel lines in, put new inline filters in, carbs have been rebuilt, and after problem started I switched carbs from one engine to the other, I switched fuel lines going from one side to the other, I know now its not a fuel delivery problem, I also disconected the red wire from the rectifier and ran it ...didnt help:ack:

 

[Diesel_7926]

sounds like it could be a coil breaking down under load? Have you tried switching them around to see if it follows the coil or engine?

 

[Chester]

Try the neutral safety switch at the throttle lever, it might be stuck closed. Disconnect it and try again. If this solves the problem, replace the switch.

Chester

 

[shakedown]

If it was the switch chester wouldnt it affect both engines? The other engine runs great. I value your judgement chester and all help is more then welcome!!!!!!!!!!! This one has me going bonkers:ack:

 

[timmyboy76]

clip plug wires and install new plugs?

 

[shakedown]

I did the plug wires and plugs Tim, no luck....How do InDisconnect the wire between the mpem and coil leaving the coil connected to the stator? do I disconnect @ the coil where the plug wires run into, or on top of the flywheel cover?

 

[timmyboy76]

check volts at battery, while run'n.

 

[shakedown]

13.5 all is good

 

[timmyboy76]

guy on other thread, had same problem, and when he lifted hatch..WHAM, motors kicked in, until shut'n it. So, maybe its airflow with yours?

 

[shakedown]

Air flow is good had hatch open while I was @ WOT, trust me I held onto it good at that speed....lol

 

[shakedown]

O.K. problem solved! I disconnected the BK/RD/GR wire that ran to the MPEM for the rev limiter, I guess the rev limiter in the MPEM (ECM) is bad, Now question is can I get by with that disconnected and run like that without hurting anything other than blowing the reverse gate off?