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Author Topic:   Excessive fuel/oil mixture through exhaust
Kelly posted 03-12-2004 04:05 PM ET (US)   Profile for Kelly   Send Email to Kelly  
I have a 1994 Yamaha 85 hp motor. I do not use it very often, especially this last year. Anyway, the last time I went out, it cranked fine and ran fine. To get back to the loading ramp, there is a fairly long stretch where you must idle until you get to the ramp, probably 10 to 15 minutes. The boat idles fine, no problem. I backed the trailer down into the water and pulled the boat on, giving a little gas to push it all the way on the trailer, and there was a pretty big puff of smoke. The motor kept running and was fine. This is just a little back ground that may or may not be related to the next item.

Anyway, the boat has been in the carport since then, I have cranked it a few times for short periods of time. The other day I went out to crank it, and since the battery is dead I just pull started the motor. It cranked after about 4 or 5 pulls. There was an initial cloud of smoke, but it settled down to what I would consider a normal level pretty quickly. I let it idle for a while running on the muffs and it seemed to be doing fine. I decided to up the rpms a little and it seemed like a lot of fuel/oil were coming out of the exhaust with the water. It almost seemed to have a milky appearance.

Any thoughts?


CHRISWEIGHT posted 03-12-2004 06:02 PM ET (US)     Profile for CHRISWEIGHT  Send Email to CHRISWEIGHT     
Im 99% sure that this is normal for most if not all 2 stroke engines, the exhaust exits the center of the prop and the large amount seen at start is almost certainly due to oil that has accumilated due to ths slow running and subsequent lack of use.

regards chris

Kelly posted 04-18-2004 11:36 AM ET (US)     Profile for Kelly  Send Email to Kelly     
Well, I put a new battery in the boat and decided to crank up the motor just to make sure that it worked. I got the same symptoms as before. When I put my hand down in the exhaust water discharge, it felt and smelled like there was gas in the water. I shut the motor down and took the plastic cover off of the carburetors and found gas accumulated in the cover. It seems like too much gas is flowing into the carburetors. Now that I think about it, when I have used the motor, it has always seemed to use more gas than I thought it should and have much more fuel in the exhaust that I thought was normal.

Any ideas. My first thought is that the carburetors need to be rebuilt. What is a ballpark estimate of what that would cost? Is it possible that there is a stuck linkage or valve somewhere that might be causing the problem?


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