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Stripper in my own Mind!
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2,540 Posts
Discussion Starter · #1 ·
Who's been running this on their 2 strokes? My Yamaha has it posted on the motor that it is the proper ratio but after talking to a few people, many claim it is still too lean and need to go back to standard 50:1. Cut and Creek, feel free to offer your expert opinions. Thx...
 

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Cert. Yamaha technician
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4,330 Posts
I had a 25 yam 2 stroke on my old skiff and i mixed it 75:1.
I figured somewhere in the middle couldnt hurt.
I personally know Yamaha does a LOT of r&d on their motors before letting them go public, and i havent seen a 25hp blow up ever (minus the older 3 cyl models).
I dont think you will hurt it at 100:1 at all, especially if your using good oil.
Now if your using cheap oil... I would 50:1 it.

Hope that helps
 

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Stripper in my own Mind!
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2,540 Posts
Discussion Starter · #4 ·
Thx for the info fellas. I have only used Yamalube on the motor and the 75:1 sounds a little better. I just like how clean the motor runs right now but better safe then sorry. Maybe I'll try 79:1 ;D
 

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Boozle on...
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859 Posts
I use amsoil saber, 100:1. I do mix it a little heavy, probably 85:1. I'm no mechanic, but I've been doing it for about a year and so far so good. It does run a hell of alot smoother, than when I run out and I have to use regular 50:1.
 

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I had a 15hp and ran it 100:1 it had over 500hrs when I sold it and it still was running strong. Anything over 15hp I would run 75:1 or even 50:1 anything under and 100:1 is fine and is acutally better for the engines.
 

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my 90 yami is oil injected 2006 , and that it set 100 :1 from fac.
Your oil injection is variable, it changes as the motor increases and decreases rpm's.

BTW  C90hp Yamaha's meaning non oil injected models are pre-mixed 50:1 ratio.

Straight from Kennesaw. ;)
 

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Cert. Yamaha technician
Joined
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4,330 Posts
my 90 yami is oil injected 2006 , and that it set 100 :1 from fac.
Your oil injection is variable, it changes as the motor increases and decreases rpm's.

BTW  C90hp Yamaha's meaning non oil injected models are pre-mixed 50:1 ratio.

Straight from Kennesaw. ;)
Creek:
You up at school? Go to the tilted kilt!
 

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Registered
Joined
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1,544 Posts
my 90 yami is oil injected 2006 , and that it set 100 :1 from fac.
Your oil injection is variable, it changes as the motor increases and decreases rpm's.

BTW  C90hp Yamaha's meaning non oil injected models are pre-mixed 50:1 ratio.

Straight from Kennesaw. ;)
Creek:
You up at school? Go to the tilted kilt!
Buddy the Tilted Kilt and I are one!!! lmao
We also have one in Jacksonville so it's like I never leave! :D
 

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Cert. Yamaha technician
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4,330 Posts
Lol. Whats the drive from Jville to kennesaw?(hours)
Our drive blows..
Too bad its not in miami, i might not show up the next day ;D
 
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