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Carb Drain Plug Question #148455 07/13/20 08:44 PM
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Kenny4 Offline OP
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A few drops of gas on the floor under the drain hose from the bottom of the float bowl. Tried to tighten the drain plug but it was tight. Would always leaving the gas in the on position cause that? It seems the drain plug is to drain the bowl and not be as an overflow for the bowl, but I'm not sure of that. I have never turned the gas off on any of the bikes I've owned and have also never experienced any leaks, that's why I 've been leaving this one on. Thanks

Kenny4

Re: Carb Drain Plug Question [Re: Kenny4] #148456 07/13/20 11:47 PM
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nobade Offline
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If you leave the fuel tap on and the float valve leaks it will overflow and do that.

Re: Carb Drain Plug Question [Re: Kenny4] #148457 07/14/20 12:01 PM
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peejman Online Content
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Yes, that's both the bowl drain and overflow hose. I'd presume that means your float needle isn't sealing perfectly, which isn't the end of the world. Turning the fuel off when parked (or about a mile before you park) is known to help make cold starts a little easier.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Carb Drain Plug Question [Re: Kenny4] #148458 07/14/20 03:36 PM
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Muniac Offline
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I always turned off the fuel and ran the bowl out of gas before parking the bike. If a hose lets go or some other leak develops you don't want a puddle of gasoline under the bike. Such things usually happen overnight in an enclosed space when the bike is unattended. Murphy was an optimist. Just a safety concern.


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Re: Carb Drain Plug Question [Re: Kenny4] #148462 07/15/20 11:47 PM
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Selden Offline
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This is a generic issue with carbureted bikes, even ones with fuel pumps, like my old Hawk GT. A friend had a Hawk, and one morning it wouldn't turn over. When he pulled the dipstick, he found that the crankcase was filled with a mixture of oil and gasoline, and the engine had hydraulic lock. ALWAYS turn the petcock valve to the OFF position when parking a carbureted motorcycle overnight.


Don't fix it if it ain't broke, don't break it if you can't fix it.
Re: Carb Drain Plug Question [Re: Kenny4] #148467 07/17/20 08:42 PM
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Craig1 Offline
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I find the carburetor float valve works just fine as a fuel shut off valve 99.9% of the time. But sooner or later that .01% bites you.
If you have trouble remembering to turn the petcock off, (like me) add a vacuum fuel cut off, or replace the petcock with a vacuum petcock.

Re: Carb Drain Plug Question [Re: Kenny4] #148594 08/01/20 01:50 PM
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JerryH Offline
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I'm on the fence about this one. Yes turning the petcock off will prevent the float bowl from overflowing if the float needle valve is leaking, IF the petcock itself is not leaking. Both the petcock and the float needle valve will eventually wear out. Both are easy to replace, though the petcock costs a lot more. Ethanol gas will shorten the life of both, since they both use rubber seals and ethanol tends to melt rubber. I've had over 50 different bikes over the past several decades, sometimes I shut the petcock off, sometimes I don't. I've had both the petcocks and the float needle valves leak. The one thing I hate are vacuum petcocks, which the XT225 fortunately does not have. They prevent you from draining the tank without a vacuum source. In your case it sounds like the float valve is leaking. I'd replace it, then it will probably be good for another 10 years or more, whether you leave the petcock on or off. Since ethanol gas came along, I've had to change my way of doing things. I never leave ethanol gas in the tank or carb for more than 2-3 weeks. If I don't burn it up, I drain it out into a gas can, then put it in a car, and put fresh gas in the bike. It can be a lot of work when you have 6 bikes, but I got tired of cleaning fuel tanks and carburetors.


The above is my opinion. Your mileage may vary.
1994/2001 custom built XT225 with a ton of aftermarket parts.




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