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  50:1 or 100:1 oil to gas ratio on 1992 yamaha c 40

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Author Topic:   50:1 or 100:1 oil to gas ratio on 1992 yamaha c 40
timbo posted 07-22-2003 02:58 PM ET (US)   Profile for timbo   Send Email to timbo  
I am still not sure of the oil to gas mix ration on my motor since last summer i have been running 50:1 to be safe but its a bit smokey so I was wondering if anyone was sure of the mix ratio. I never got the engine manuel from the orevious owner so I figured I would ask here before buying the manuel.
JBCornwell posted 07-22-2003 03:16 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Several makers tried recommending 100:1 in the late 80s and early 90s in the interest of reducing pollution numbers on those engines, Timbo.

Warranty claims for fried engines convinceed them to go back to 50:1.

Stick with the 50:1. If you can't stand the smoke, go to the big buck$ synthetic oil, get a DFI engine or get a 4 stroke.

Good luck.

Red sky at night. . .

Bigshot posted 07-22-2003 03:34 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Call a dealer but my guess is 50:1. I do not think they EVER went to 100:1 over 30hp.
Lagged posted 07-22-2003 05:17 PM ET (US)     Profile for Lagged  Send Email to Lagged     
My 94' Yamaha 50 takes 100:1, but it is a 3 cylinder engine so it could be different. The yamaha carbed 2 strokes still take 100:1 I think.
Bigshot posted 07-23-2003 12:41 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I have only seen the C-90's and almost sure 50:1. If your 50hp and my 30hp were 100;1 then I assume the 40hp is too. Do NOT run 50:1 in an engine designed to run 100:1 it will carbon up and stick rings.....then BOOM! I usually ran about 85:1.

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