Excessive fuel consumption Yamaha 115 V4 2-stroke

P

PPCS

Seaman Apprentice
Joined
Apr 9, 2008
Messages
44
Hello Everyone,

Today I took my new boat out for a spin! The engine runs like a charm, but it uses lots and lots of fuel! I was only cruising at 1500Rpm and it did almost 3 gallons an hour!!
I also noticed that the engine smells really rich of gasoline fumes coming out of the exhaust. As my previous outboard was a 20HP 2-stroke I'm familiar with two strokes, but I'm not familiar with large 2-strokes.

However this amount of fuel consumption at these low cruising speeds 1500RPM doesn't sound normal to me.

- What should my engine burn? Especially at low RPM's
- Does the extremely rich gasoline smell has anything to do with it, is this normal for this engine??

Hopefully this can help, because a wonderfull day on cruising ended in a bit of dissapointment, because of the fuel usage.

Hopefully you guys can help me out!

Regards
 
R

robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Re: Excessive fuel consumption Yamaha 115 V4 2-stroke

I had a 115 2 stroke Yamaha for a few years and they do like their gas! The rule of thumb is a WOT fuel consumption of about 10% of the rated horsepower, in your case about 11 gallons per hour. Go to: Yamaha Outboard Performance Bulletins and plug in your boat/motor combination for a chart showing GPH, MPG, MPH at each RPM. Also if you have a bad fuel pump diaphragm it can suck fuel directly into that cylinder causing high consumption and maybe fuel-wet spark plug on that cylinder. Check it out! Good Luck!
 
P

PPCS

Seaman Apprentice
Joined
Apr 9, 2008
Messages
44
Re: Excessive fuel consumption Yamaha 115 V4 2-stroke

I checked with the yammie performance bulletins, and I figured that my engine should do about 2 gallons per hour on 1500rpm. So I definitely use a significant amount of fuel more that what is normal. I'm gonna check with my mechanic tomorrow. Hopefully it is something with the fuel delivery or thermostat. Because if the engine is really that thirsty I'm gonna have to swap it. The fuel prices are just too high over here at 8 dollar per gallon!!!

What do you think?
Nature of the beast or is there something wrong??


Regards
 
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