Re: F100 Won't Go Past 2000rpm
when testing the motor you have to have a methodfical plan. it also requires a certain amount of knowledge,obtainable in the service manual, and basic test equipment.you first must verify the engines mechanical integrity. the the ign and its subsystems then fuel and its subsystems.<br />if its the rev limiter the motor will shake badly as the ECU misfires various cylinders.<br /> so far I have not seen the trim tied to the ECU. <br /> quit revving it without a load , you can throw two spark plugs away and rev to 4K on the flusher.<br /> its meaningless.<br />not much in the way of sensors on that F100.<br />if it over temps or lacks oil pressure it sets the rev limiter,audible and visual indicates.<br /> if its the engine ECU that set a fault and you have factory Yamaha rigging if one engine enters RPM reduction they both do.<br />thats why I stress using genuine yamaha stuff rigged by a trained yamaha tech.<br />if the TPS fails you will have fixed timing. the diagnostic test lamp is about 70 dollars from yamaha and will indicate if its an ECU monitored sensor.<br /> most the time its lack of fuel in the combustion chamber for whatever reason.<br />if the TPS fails it will idle fast and timing will be fixed at 10*BTDC.<br /><br /> I know its frusterating but it is what it is and the steps to repair it MUST be followed.<br /> you MUST verify spark at the correct time at the problem RPM and enough aif/fuel is entering the combustion chamber at the correct time.<br />suck,squeeze,bang and blow.<br /> everything else just helps it go.
. I also appreciate his knowledge and willingness to share that knowledge. I don't have a creek nearby but I did think about dumping the whole motor in the bay and coming back later and fishing it for grouper. I'll try and check the items you suggested. Thanks again.