2003 HPDI 250s

Is this the 2003 set on Facebook? I think he wants $11k for them? I saw them too. They look clean. I guess the best thing to do would be a mechanic who could run the factory software checks, run them in the water and look them over for you. A few hundred dollars up front beats a lot more after the sale. I am sure you could work the cost of the mechanic into the deal.

Let us know how you make it. I want to swap my ox66 on my 272

I have no direct experience with HPDI, but don't the 250s have the reputation of being pretty much the worst motor Yamaha ever made?

If you pursue, have someone in the area that is very well versed in HPDI motors check them out.

The 250 hp HPDI has been a problematic engine.

Rather that going in to details, Google "250 hp HPDI problems".

The OX 66's were bullet proof motors....but what are they now? 14 years old? Even the best ( and they were) motors will eventually die. I'd be more inclined to rebuild/replace power heads on the OX66's than try another set of used HPDI's.

If I were in your shoes, I'd look for a pair of newer 4 strokes, yam, zuk, Honda in the 20-30K range. The only thing worse than spending money is not being able to use ur boat...

Keep looking, there are better engines out there.

It sound like a "best case scenario" for used 2 strokes if that is what you're looking for. Check NADA values.

Tatt00z said:

only faults were 6 overheat records last one a 330 hours. 114 over rev control record last one at 391 hours.

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6 overheats and 114 over revs? I wouldn't touch those things!!!

gw204 said:

Tatt00z said:

only faults were 6 overheat records last one a 330 hours. 114 over rev control record last one at 391 hours.

Click to expand...

6 overheats and 114 over revs? I wouldn't touch those things!!!

Click to expand...

These alarms are not necessarily a bad sign especially if there haven't been any in 300 hours or so. Just sucking a plastic bag onto the water inlets will result in an over heat alarm and sooner or later, everybody sees a few of those. There are other things like sucking sand, motor trimmed up too far etc that can lead to an over heat alarm. The motor trimmed up too far can also lead to an over rev alarm. The ECU will kick in the over rev logic at a set RPM depending on the motor model. Just hitting a decent wave crest can lift the prop high enough out of the water to cause the rev protection to kick in when you are cruising near WOT. Depending on the prop, over revs can occur just by running WOT.

I am not sure if that motor gives the hours at specific revs report. That can tell how hard the motor was run or in some cases how slow it was run. That report can tell a lot about actual use/abuse
The fact that the visual inspection and compression test looked good is about as good as you can hope to see. If the seller has maintenance logs, that helps too since it shows care.
I always tell folks to look at the condition of the boat it self as an indicator of the mechanicals. If the boat is well maintained and neat, there is a decent chance that the owner took care of the machinery too.
Now on the other hand, there have been issues with those HPDIs and often there isn't a lot of notice but rather more of a kaboom situation. The price is an important factor and without knowing otherwise, I wouldn't write them off just because they are HPDIs.

Yea, easy to over rev, come out of a big swell and props pop out. Overheat ? Could be on the flusher or sucked up obstructions. HPDI wasn't one of Yamaha's success stories for sure ( like the OX66) but a few still out there. like another poster mentioned the price would need to be attractive.

That's a good deal on those motors. Yea, these have been problematic but if you can head off the problems before they happen...great. The biggest problem being the fuel system. The first thing I would do is install 2-micron Racor fuel filters. Search THT Yamaha HPDI Mystery Filters. It's probably up to about 20-pages now. There are numerous filter screens through the motor that are very fine and tend to clog. Especially if you have an old boat that was run on non-ethanol fuel. I also believe there was an upgrade to the oil system. When this motor is running correctly, and properly propped it's screams. Owners also claim they are pretty economical to run.

Good Luck. It should be a very strait-forward changeover. You should keep your eyes out for an OX replacement and keep a spare pair of motors in the basement..LOL..