Engine dies at slow speed

J

John Harbinger

Recruit
Joined
Aug 24, 2005
Messages
1
I have a 2003 9.9 Johnson, 4 stroke, electric start. It was running perfectly until last weekend. It would not stay running at low throttle. It was a very humid day, I had a fresh tank of gas. <br /><br />Any ideas? Could there be some condensation in the carb? How do I drain the carb?<br /><br />I am a moron about engines, any advice before the call to the mechanic would be appreciated.
 
H

Hunky Dory

Petty Officer 2nd Class
Joined
Jul 20, 2003
Messages
102
Re: Engine dies at slow speed

I don't know a thing about your engine but it sounds like carburetor icing. Try googling it and you'll find things like Icing tech discussion and lots of scary stuff about airplane crashes. Most interesting is the temp range cited here: Civil Air Patrol <br />
It's possible for carburetor ice to form even when the skies are clear and the outside air temperature is as high as 90°F, if the relative humidity is 50% or more - especially when operating at reduced power settings. The envelope for the most severe buildups of carburetor ice is between 65 and 100% relative humidity and 25 to 65°F. In other words, carbureted engines are susceptible to icing almost anytime.<br />
Click to expand...
If it was icing, there will be no evidence now and the mechanic will not have anything to fix.
 
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