Yamah in-lin 4 cylinders
 

I mentioned this in my repair thread, but decided to start a new thread over here in performance on this subject.

How about the new light weight good-on-gas in-line 4 cylinder 4 strokes by Yamaha? Looking at 150hp or 175hp (rather have 200 but not bad enough to spend thousands more. The weight is only about 10 lbs heavier than my current 150 2 stroke. Performance bulletin on these motors are insane.

http://yamahaoutboards.com/sites/def...-04-22_ALM.pdf

In my case I'd essentially cutting my fuel burn directly in half!

Compare to an old bulletin on my engine with comparable hull & weight:
http://yamahaoutboards.com/sites/def...-225-CSK-B.pdf


So there ya go BGREENE, with the 60 gallon tank (I've actually gotten 64+ gallons in it once when it was bone dry) this engine I'd have RANGE to hit the canyons 60+ miles out. I would guesstimate somewhere in the 4 - 5 mpg range overall with my setup.

exactly what happened when i went to a merc 150 4S.

I've heard the 150 is actually churnin out 165 at the prop...have you run across any similar info on the 175?...what it's true prop HP is?...the 200 requires Hi-Test btw...

freinds of mine
http://yamahaoutboards.com/yamaha-advantage/reliability

still thinking hard about it but got a couple other things to take care of first (car for daughter etc. )

How about vst filter maintenance? I hear yami recommends annual change out but from talking to friends with 4 strokes they've never changed the vst filter?

Spare?

usually some one gets crap gas before the filater cloggs under normal use. The horse shoe filter before the vst can be repalced without removing the intake, but its not that big of a job to pull the intake, clean out the vst and replace all the filters. When I service an engine with a vst, I usually open the drain and flush it a bit with the primer bulb before starting it up, it gets the heavy crap out of the vst

I was told when they tune their motors SAE allows a difference of +- 10% hp than what is rated for. Its been proven with most motor manufactures that they all produce hp in the +10% range. So 10% of a 150 is 15hp. So its true you can get 165hp from a stock 150hp. Its pretty much the norm.

As for the Yamaha motors, the dealers here in Jacksonville, FL think they are gold. One quoted me 16,500 installed for a 4 stroke 150. One other quoted me 15,900. This is with out any digital gauges, just analog. Called the Mercury dealer close to me, he is quoting me 10,700 on the motor 13,500 out the door on a 150hp 4cly, with two of the smartcraft gauges, full new rigging(I am providing hydraulic steering), an extra 2 year warranty (total of 5 years with an option to buy 2 more years) and there is a 500 dollar rebate. I am going to give it some more time to see if the new motors they produce are doing well. So far everyone that I've found have had 0 issues with them.

Be careful with that 10% +/-. YAMAHA got busted BIG time over this when the 200/225 4 strokes first came out. After they were out for a few years, some magazines dyno'd them, and found the 200 was making roughly 212-215 HP, well within the +/- 10%, the kicker was the 225 was also dyno'ing in the 212-215 HP range. It was within the +/- 10%, and was teh only thing that saved them, but those 1st 3 years were turning out the same engine for both 200/225, and charging $1200 more for different stickers.

starz,those were the exact same numbers for my merc. i've been pleased so far,just rolled over 200 hours on it this weekend.
the way i figure it i've saved 4 gallons @ hour over the 150 2S (6gph vs 10gph). so thats 4 x 200= 800 gallons x $2.50=$2000 + 16 gallons of merc 0il @ $25 = $400.
total fuel savings $2400.

so in 5 -6 years, it will pay for itself

i realize there are a LOT of variables in this equation, but it's the one i used to convince myself to buy a new motor.

feel free to use it

I was ANTI-4 stroke for a LONG time, but after having one I couldn't go back. 2 stroke DFI's are just to complicated anymore IMHO, but 4 strokes aren't much different than car engines with EFI systems closely mimicking the late 90's for cars. Software is out now to scan most of them, so that helps to cut the dealer out, they are SO MUCH QUITER it is ridiculous, and they are getting the weight down on them now to a point thats not much of an issue now. I still like old school 2 strokes for simplicity, but being able to listen to the radio while having a conversation on plane is nicer.