Yamaha hpdi help

[Craigslistmaniac]

My 2004 hpdi 150 runs great at idle-3/4 throttle but after 3/4 throttle it revs and bogs revs and bogs check the video. Any ideas whats wrong? All filters have been changed

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[99yam40]

Re: Yamaha hpdi help

get it hooked up to a computer, monitor fuel pressures and clean test injectors

 

[Capt Ken]

Re: Yamaha hpdi help

See what your fuel pressure on the VST is when this happens. You will need a fuel pressure gauge for this. Sounds like one of your low pressure pumps is failing.