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Old 27 July 2005, 08:21   #1
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Drain the carbs?

Hi All
When finishing with a 2 stroke after a days ribbing I understand its good practise to switch the fuel off then run the engine until it splutters through lack of fuel and then shut off. I likewise understand this stops the fuel in the carbs from 'going off?' and making the carbs dirty and hence less efficent.
Two questions in regard to this,
1. Is this correct and if so how important is this.
2. I have no seperate fuel shut off so actually can't do it anyway! Should I get one fitted?
Kernow
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Old 27 July 2005, 08:58   #2
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This is correct as it will stop an oily build up in the engine. The easiest way to do it is to disconnect the fuel line from where it connects to the engine, or if it connects inside the engine then kink the fuel line to stop the flow of fuel.

Also remember if the boat is left for a while with fuel onboard then to add some fuel additive to the tank to prevent the fuel going off.
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Old 27 July 2005, 09:05   #3
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And also. If your 2 stroke is of an injected type, will running an outboard dry require the 2 stroke oil to be bled though again?
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Old 27 July 2005, 09:23   #4
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I fully agree that this is a sensible thing to do and have been doing it for years without any problems whatsoever but.......I found this in the Seloc Mariner Manual:

"For many years there has been the widespread belief that simply shutting off the fuel at the tank and running the powerhead until it stops is the proper procedure before storing the engine for any length of time. WRONG"

It then goes on to explain that fuel is trapped in the float chamber, passages and jets etc. It says the only guaranteed way to ensure all fuel is removed is by stripping down the carbs....

It also goes on to say that doing this removes the fuel/oil mixture from the cylinders, pistons and bearings (???? have I missed a meeting and have the laws of physics been changed without a vote?)

Now you can call me an old cynic but I suspect that while the theory they quote is right (ie fuel is still trapped within the carb in small amounts), it might have more to do with gasket kit sales than practicalities???

Like I say, I still remove the fuel line and let the engine run dry by itself and so far, after only 30 odd years of boating, haven't had a problem........yet!!
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Old 27 July 2005, 09:58   #5
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Thanks guys, from now on thats what I'll do.
Quote:
kink the fuel line to stop the flow of fuel.
Simon, obviously I'd already thought of that! Just forgot to mention that was what I'd do ..........
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