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Jan 23rd, 2013
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2007 Yamaha VZ225 HPDI bogging at takeoff #13611944 06/29/20 02:05 PM
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SSutton Offline OP
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Is this normal? I just recently changed VST filter, fuel filter, plugs and mystery filters to see if that would fix it. It does not throw any codes so I was curious if this is a safety issue with these motors. I bought the boat a couple months ago. It mainly does it right after launching or if I idle an area too long, say if I'm trying to graph an area. It seems like only a couple of cylinders are firing, then the rest of the cylinders kick in after a few seconds after I throttle down. I have a hot foot too, and was considering this as an issue, maybe the throttle cable is sticking. I know on some motors that only 2 cylinders work on idle with the remaining kicking in after a certain rpm is reached. Any help would be greatly appreciated.

Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13612007 06/29/20 02:47 PM
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smooth move Offline
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sorry for your problem. i had so many fuel related problems with my 200 hpdi that it was less expensive to sell it and get a new motor. much easier on my mind. i got to where i had absolutely no confidence in the hpdi. i hope you get it figured out.


es le bon ton roulet
Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13612027 06/29/20 03:00 PM
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SSutton Offline OP
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Thanks smooth move, but that is not good to here. I was hoping that this is normal activity for the HPDI. It runs great after on plane, but the starting is the problem, and only when it is a cold engine or running on idle for awhile. I know these engines are finicky and you need to run ring free and ethanol free to have the best performance. It just seems it may be something easy. When I took off the old plugs they did not have that much carbon build up.

Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13612516 06/29/20 09:25 PM
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You also need to check the medium pressure fuel filter, fuel water separator and the low pressure fuel pumps.

Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13612560 06/29/20 09:46 PM
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Did some reading on the low pressure fuel pumps....That's next on the list to change! I think I did replace the fuel water separator (filter?). Where is that located? Medium pressure fuel filter will be the last to go...since it is a more expensive item. It does smoke some at start too, so I am thinking the low pressure fuel pumps. Thanks Bahala.

Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13612580 06/29/20 10:01 PM
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Rather than wasting money throwing parts at it, try taking it to a good mechanic. Would have already cost you less and it would be fixed right. What you are describing is probably either low pressure fuel pumps, neutral safety switch or a burnt out tuner. They are great motors if taken care of properly. I've been running one for 15 years now.



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Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13613309 06/30/20 01:54 PM
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Chris B from what I've read the low pressure fuel pump is a maintenance issue. Since I did not get a service list of what the previous owners had done, I'm going to be changing out those parts anyway to have a baseline. I can change the low pressure pumps no problem. Just needed to know where to start. And it's not at the point where I cannot drive the boat, just annoying at this point and I know it will eventually need attention. Thanks for the input, I'll check the other 2 as well.

Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13613763 06/30/20 07:16 PM
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Thing is if your starving the engine for fuel you will likely blow it soon. Don’t continue to run it or it will. A mechanic can hook up his laptop and tell you in a minute and tell if it is losing fuel or something else. It’s warning you so take it seriously. Don’t let it be a $8,000 mistake. Good luck.



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Re: 2007 Yamaha VZ225 HPDI bogging at takeoff [Re: SSutton] #13613861 06/30/20 08:29 PM
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I had a tech hook it up when I bought it and it did not show any codes, and that was a couple months ago. The previous owner did say he ran 93 octane, and I'm wondering if that has something to do with the bogging. I've changed to 87 ethanol free with Yamaha ring free hoping that will clear up the issue. Just made the change so I will have to run it. I agree, I do not want to make an $8000 mistake and that's why I'm changing everything I can out. I plan on getting the injectors cleaned by a tech over the winter.

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