2002 225 yamaha vmax hpdi series 1

First off this is my first posting on here so bare with me...

I have an '02 225 yamaha vmax hpdi that has around 800 hours give or take and have a problem that I can't figure out. The engine won't rev beyond 2000rpms and I have gone through the filters and all the lines making sure all are not rescricting fuel to the engine. Also have taken the time to flush the engine and lines to assure all things not supposed to be there are out. Finally I have had a couples ideas that I wanted to ask if it could be; first is whether it could be the stater (spl), second i have been told it could also be the tuner because of the high hours on it, and number three I have been told there is a 4th filter on this engine that i missed in my check up, but have looked over the engine break down and can't find it. I apologize about the long question, but any help would be greatly appreciated. Also, if I have left out any info that could help in a diagnosis just let me know and I will do I can to get back to you with the needed info. Thank you again

Re: 2002 225 yamaha vmax hpdi series 1

First off post the motor model #, someone will be asking for it and should always be posted with your question.

is your alarm system working properly? Safe mode will limit RPM because of oil or temp. and maybe other things.

have you checked fuel pressures on rail and other places, spark and compression on all cylinders, timing, and under what conditions will it not go above 2 K RPM (neutral, in gear loaded, Etc.)

Re: 2002 225 yamaha vmax hpdi series 1

yes someone will ask for a model number
the VX 225 was built from 98 to 05 the VZ225 was built from 03 to about 06 then went to a series II.
both were fuel injected but incredibly different.