Help! Yamaha engine techs or experts. Help! Yamaha engine techs or experts.
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    Help! Yamaha engine techs or experts.
from Ty (  
12/19/2007 11:22:00 AM


 I am a first time boat buyer and i am looking at buying a 18ft aluminum bass boat (Xpress H18) which comes with a Yamaha engine. I will be using this boat for bass fishing in lakes 95% of the time, the occasional joy ride and to pull a skier every once in a while. I have read hundreds of forums on the 2stroke vs. 4stroke topic and cant get a clear answer to my question. I am trying to deside between the Yamaha F150 and the 150 VMAX HDPI. I have heard all the stuff about the more weight of four strokes but there is only a two pound difference in the weight of these two engines on the Yamaha specs part of their webpage. I have heard people down the 4strokes for all of the extra moving parts and expense of repair when things break. Are the Yamaha 4strokes more of a troublesome engine and does it cost more to repair than a Yamaha HDPI motor? If properly maintenced which would last me the longest and at the least expense of maintence and repair? In my "uneducated O/B mind", a 4stroke would seem more of a longer lasting better built motor but im i wrong?

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   not a tech or an expert but from MikeF  12/19/2007 11:34:00 AM
I won't let that stop me from voicing my opinion. LOL

The problem with 2 strokes is it's hard to make them EPA compliant. In doing so they tend to run as lean as possible and with as little oil as possible. Neither of these two things are good for longevity.

But they are faster in most cases. So the question is do you want to go fast or do you want a motor that will live longer?

What's the current factory warranty on the two? Normally this time of year it should be 5 or 6 years for free.

   Four Strokes from saltwaterman (  12/19/2007 1:16:00 PM
Ask anyone that has gone from a two to a four stroke and see what they have to say. 99.999% would never go back to a two stroke. I myself always wondered what the fuss was about. I then sold my Merc 175EFI and went to a Yam F200. Wow, wow, wow. Night and day difference. The Yam starts and runs like a fine automobile. It is so quiet that it is spooky. Yam will be offering an extended warranty program beginning in Jan. With the F150 you will get three extra years of warranty plus some credit money I think. Resale of four stokes,particularly with an extended warranty, is very good. Two stroke resale is much much less. Regarding the extra parts in a four stroke, stop and count up all of the roller bearings, reed valve petals, etc etc in a two stroke and suddenly you will find a four stroke does not have that many extra parts after all.

   4 strokes from JoePA (  12/19/2007 3:06:00 PM
Being that your from TX you can go for a ride and decide. If I were going to get a 4 stroke it would be a yamaha. Very reliable and seem to have pretty good customer service. Don't own one but you don't hear many people complaining about having problems...4 stroke or HPDI!!

Got to love a Hammer!

   Most of the guys .. from Toonafish  12/19/2007 3:48:00 PM
complaining about 4 strokes are the same guys that will spend $800 or more on a custom prop to get 2 more mph....and that's fine but, if you've ever actually owned a 4 stroke, there is nothing better than just turning the key and hearing that deep quiet hum. No expensive 2 stroke oil to buy, no fouled plugs, no noise. Now for some those may not all be positives, but for me, they are.

Maintenance is - every 100 hours you change the oil then change the impellar, plugs and LU oil when it needs it. I have read of many commercial fisherman having over 2 thousand hours on their 4 strokes with no other maintenance.

Yamaha makes a great engine in both 2 and 4 stroke so either way, I think you would be happy.


   Wow! from Ty (  12/19/2007 4:20:00 PM
Wow! Thanks. Thats exactly what i wanted to hear. The limiting of oil in those DI 2 strokes to meet EPA requirements kind of scares me when it comes to longevity. Motors need oil! And i dont care if i dont have that tiny bit of more acceleration or 4mph top end speed that the 2 stroke claims to have over the 4 stroke, im not getting into the races. I want quality and longevity even if this isnt only boat i purchase in my life time. Im going 4 stroke.

   The way I see it from Glenn Abuelhaj (  12/19/2007 7:41:00 PM
Yamaha is currently having an oil pump recall on the 2 stroke engines. This is to replace the original oil pump with a new and improved pump that pumps MORE oil. It appear's that Yamaha "leaned" out the original oil pumps' volumn in order to meet EPA and CARB requirements on the front side. Now that they sold a lot of 2 stroke motors, they are retrofitting them with the new and improved oil pumps.

This could also explain why they are getting out of the 2 stroke business altogether. They made one last hail mary to inflate their bottom line before exiting the 2 stroke market. Thus the segway into the total 4 stroke market for Yamaha. I hear nothing but good info on their 4 stroke product line.


Good luck!

   I'm very happy with my HPDI... from SurFishaLot (  12/19/2007 8:11:00 PM
but I see some merits of the 4-stroke.

One of the biggest factors for me is the extra storage/mechanical space that you can gain by not having an oil tank on board.

I'd be running an F200, if they had made one with a 20" shaft in 2004.

If you're going to troll - no contest - 4-stroke all the way.

   2 and 4 stroke Yamahas, feature/benefits from Jt (  12/19/2007 10:06:00 PM
Ty feel free to call me at 919-552-6935. I will be glad to discuss your topic with you. I have a fair amount of knowledge on this subject.

Thank you!

   Hello Jt, a simple question - - from 203dcx (  12/20/2007 4:24:00 AM
are the Yamaha 150 HP and up 4 -stroke engines all naturally aspirated engines? Just curious.

Thanks, Jim

   Yamaha Four Stroke from ClarksHillGA (  12/20/2007 9:46:00 AM
I was in the same place as you back in 2005. Was looking to add a bigger boat for my growing family in the form of a fish/ski. I looked and drove everything and decided on the Stratos 486SF with the F150. I could not be more happy and have not had a single issue at 100 hours. Changing the oil is simple if you take your time, but the oil filters are $20+. I got a 6-year warranty and my wife loves not being consumed in blue smoke when we crank up. Just don't forget to turn it off before pulling it out of the water on the trailer as they are about that quiet. I have no problems pulling skiers or getting to the farthest reaches of the lake, even if one minute slower than a faster boat. I still have a ton of gas left from Labor Day weekend that I couldn't burn off no matter how much skiing, riding and fishing we did due to very good fuel economy. (It's got Stabil in it and I'll be burning this off with some fishing over the Christmas break, if I can find some water in this state.) I currently own another two stroke as do many in my family and we all love my F150. Hope this helps!

   Yamaha Four Strokes from Jt (  12/21/2007 9:48:00 AM
Yes Jim, all of the Yamaha four strokes from the 2.5 hp to the 350 hp are naturally aspirated.

As other posters have pointed out, you will give up just a little speed (something like 2 - 4 mph) in an 18' class boat and also the hole shot will be less with a 150 hp four stroke vs. a two stroke. Your experience may vary slightly, but this is close. However, you will gain quietness, smoke free operation and much better fuel economy compared to a carbureted two stroke. Customer Satisfaction is very high for the F150 from actual owners. The two stroke is a good engine too, just a different animal.

   Prices? Salesmen? from Ty (  12/21/2007 10:55:00 AM
The boat i am looking at is nationally advertised with a V150TLR (carb 2stroke). How much more can i expect to pay for F150? And what is the difference in price of the F150 and the VZ150TLR (DI 2stroke) model? The nearest boat dealer for Xpress boats in the Fort Worth, TX area is in Mesquite (Dallas) and thats an hour drive for me so i was trying to get the downlow on price difference before making the drive. Is there a webpage with price listing? Everyone i go to says call for pricing. I dont like dealing with sales people on the phone, its a pain. from saltwaterman (  12/21/2007 1:18:00 PM
no msg

   Oil Filters / Clarks Hill from Kanadakid (  12/22/2007 6:10:00 AM

no need to spend $20.00 on oil filters. Hastings, K&N and Wix all have exect fit filter for the yamaha outboards. I mention these three becasue they all exceed the Yamaha filter and all other aftermarket filters.

I'm sure there are a few Amsoil guys on here who can tell you what filter they carry for the engine too.

Personally I'm using the hastings or K&N. The filter weight twice as much as the yamaha (denso) filters. The K&Ns actually have a nut on the end for easy removal and insallation.

If you ever want to see a really well made oil filter cut open a Hastings or K&N. Want to see a really bad cheap filter, cut open a fram.

Anyway I pay about 7 to 8 dollars for the K&N's or the Hastings. And I beleive that I'm getting a better filter.

And 4 strokes R da Bomb !

Hope this helps,




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