View Full Version : what do you guys think about the Yamaha 150 HPDI?

08-16-2005, 08:02 PM
Duckworth couldnt build the boat that i wanted but Weldcraft has just the ticket.The dealer offered me a Yamaha 115hp 4 stroke,or for a $1000 more ;D,I can get a Yamaha 150hp HPDI.which would you go? ;D
thanks Richard

08-16-2005, 10:30 PM
The 150 is technically a generation beyond the 115. But both are fine engines. Your decision should be based on the size and weight of the boat. You didn't give us any information on that.

08-17-2005, 04:12 AM
Its a Weldcraft 186 Maverick.

08-17-2005, 07:12 AM
The 115 will push that boat just fine. If the boat was 20' or more, I would recommend the 150. You want an engine that will keep the boat solidly on plane at 3,800-4,000 rpm with your normal load and the smaller engine will do that. Anything more than that is just a waste of money unless you feel the need for speed and don't care how much fuel you burn.

08-17-2005, 07:35 AM
I just checked the Yamaha website and they have the performance specs for that exact boat and motor:

Click here (http://www.yamaha-motor.com/assets/products/otb/bulletins/bulletin_4stroke_midthrustjetport_al_wld-188rebel-f115txr.pdf)

7.5+ mpg at 4,000 rpm and a top speed of 40 mph! The 115 is the perfect match for your new boat. And the new 115 is the same DOHC technology generation as the 150. It's just 60 lb lighter.

08-17-2005, 07:53 AM
Doc is right about the gas milage, I have the 150 on my 19' and at best I get about 5mpg, but the 150 is a solid running motor and I love it, you can't go wrong with either motor, but with the price of gas only getting worse I'd opt for the 115..

08-17-2005, 02:29 PM
The weldcraft site has the specifications and performance of the Yamahas on the 20dvt

The 115 will power the 18dvt just fine... your fuel consumption will be about the same at 30 knots but better than the 150 at 20 knots

The 18dvt is a good choice...

4" reverse chine...external mounts...well built..

One of the two I'm toying with....

toying being the operative word there ;D ::)

08-17-2005, 04:37 PM
I had a 18ft Duckworth on order but they will not budge on there floatation ???.I went back to look at the 186dv because it had there outback bracket for the engine and it had the transom that I wanted.I was going to go with the 115hp Yamaha but for 35hp more for only $1000 plus 10mph! ;D Looks like next weekend will be my road trip to pick it up.
Richard ;D

08-17-2005, 05:14 PM
Great. Another 50 mph fisherman. Who needs jetskiers. ;D ;D ;D

08-17-2005, 08:18 PM
Congratulations...let me know what you think after you've broken it in....

and how they treated you...

all the gory details.....50mph....I don't know about that!

08-17-2005, 08:33 PM
Rusty, you should know by now that I never lie and I'm always right. ;) ;D

Weldcraft Performance with 150 (http://www.yamaha-motor.com/assets/products/otb/bulletins/bulletin_4stroke_hpv6_pro_wld-188rebel-f150txr.pdf)

Actually, there's not much difference in fuel economy if you can just keep off the throttle with the bigger engine.

BTW, Yamaha has a really informative web site.

08-17-2005, 09:41 PM
The 150 HPDI is a 2-stroke while the 115 is a 4-stroke. I'd go with the 4-stroke. It has enough speed. It'll run more quietly. It'll get significantly better mileage and cost a lot less to run it. Gas is starting to push $3 a gallon! It doesn't have an oil reservoir taking up space in your boat. It doesn't require you to keep buying and filling it with oil. It has a 3-star CARB rating while the HPDI is only a 2-star. This means runs cleaner, has lower emissions. At some point in time, some more waters may ban 2-star, two-strokes. A few waters already do. Unless you really need the extra speed, I'd sure go with the 115hp 4-stroke. I seldom run my 18-1/2 ft Lund at full throttle. Like Doc already said, I like to cruise at 3000-4500rpm. This keeps me on a steady plane and gets better gas mileage. Good luck on your decision.. Larry

08-17-2005, 10:46 PM
Oops! I assumed that he was talking about the 4-stroke TRX. An extra $1,000 was too good a deal for the 4-stroke. Should have picked that up.

You'll take at least a 30% hit in fuel economy with the 2-stroke regardless of what they might tell you. The 4-stroke 115 hp will also last a lot longer.

08-18-2005, 08:00 AM
Let's see...that's 2 points off and one red mark ;D ;D ::)

Here's the 150 test on the 186 DV Maverick


and the 115 test on the 186 DV Maverick


08-18-2005, 10:07 AM
Hmmm. I had the wrong boat model. Surprising what a few extra pounds, wider beam, and a deeper V hull will do to performance. But I think the 2006 Yamhas have been tweaked for better fuel economy than the 2004 engines.

08-20-2005, 03:48 PM
I'll let you know how it goes with the boat.I'll be cruising the Columbia River on the 29th of this month.I cant wait ;D.I dont need to go 50 mph but at normal speeds,the 150 turns less rpms and still gets the same fuel economy as the smaller 115hp 4 stroke.
Richard ;D