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Author Topic: 2001 HPDI 200hp bogging down  (Read 2943 times)
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Fightin Irish
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« on: July 29, 2015, 10:49:04 AM »

Need some advice!  I have a set of 200 hp yamaha hpdi. My one motor is bogging down as soon as I hit 2000 rpms in forward.   When in neutral I can rev it up and it doesn't big down but it does under way.  I changed the fuel filters and water separator which had good clean gas in it.  Changed the plugs cleaned the screen in the vst tank but it still is bogging down.   Any thoughts what it could be before I have to take it in for service. 
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Tight Lines and Screaming reels
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« Reply #1 on: July 29, 2015, 11:44:32 AM »

I call dirty Carb..  Restriction under a load thumbs up
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« Reply #2 on: July 29, 2015, 12:33:20 PM »

Need to check fuel pressure

My bet it's low.

Pinched line to the engine?
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« Reply #3 on: July 29, 2015, 02:18:32 PM »

HPDI
= high pressure direct injection

of fuel @700 psi
= no carb

I think there are 2 (or 3) fuel pumps

my bet is the inlet screen on the HP pump is clogged

or the HP pump itself is bad
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IrishAyes
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« Reply #4 on: July 29, 2015, 06:05:04 PM »

ON my old 2 stroke I had a problem with it bogging down at about 2500 rpm. Believe it or not, it turned out to be an electrical problem. The stator was bad. Mechanic told me that Yamaha builds the stator in two sections. If one section goes bad the other section still functions and can get you home. When the one section stops firing you are only running on half your cylinders. Sounds strange but it cured my problem. 
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john0185
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« Reply #5 on: July 31, 2015, 12:35:44 PM »

Mine bogged down the same way. It just turned out to be a bad plug wire.
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