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It is currently Thu Oct 19, 2017 6:51 pm

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 Post subject: Re: KTM carb overflow issue
PostPosted: Fri Sep 01, 2017 11:51 am 
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Dirt Shark
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Joined: Wed Nov 05, 2003 5:12 pm
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Location: Acworth, Ga.
I've thought about the gas cap vent being clogged but why/how would it clear up once the bike is started? Seems like it would create a vacuum and starve the bike for gas.

What am I missing?

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 Post subject: Re: KTM carb overflow issue
PostPosted: Fri Sep 01, 2017 9:38 pm 
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GOR Assisted Living
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Location: Stockbridge, Georgia
Could be a vent/drain/overflow line also. Could be a partial thing or things. Lines and caps do weird things sometimes and people miss it. I'd make sure all ports are clean and clear before getting too deep. Don't assume anything on weird problems like these. Did this just start one day, or after the carb was off or worked around or anything like that? If it was like this since you got it, don't assume the previous owner didn't hook something up wrong or didn't half fix something or install a "close enough" part. Gotta start at square one and make sure everything is as it should be.

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 Post subject: Re: KTM carb overflow issue
PostPosted: Fri Sep 01, 2017 9:40 pm 
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GOR Assisted Living
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S.Anderson wrote:
I've thought about the gas cap vent being clogged but why/how would it clear up once the bike is started? Seems like it would create a vacuum and starve the bike for gas.

What am I missing?


Check valve in backwards?

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 Post subject: Re: KTM carb overflow issue
PostPosted: Sat Sep 02, 2017 4:13 am 
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KTM GURU
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Location: Cedartown
It's a long shot, but what premix oil are you using? No Klotz, or anything with castor bean oil in it?

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 Post subject: Re: KTM carb overflow issue
PostPosted: Sat Sep 02, 2017 8:41 am 
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Dirt Shark
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Location: Acworth, Ga.
I am currently using Lucas oil for premix.

I'll check everyone's suggestions when I get a chance and report back if I find the answer.

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 Post subject: Re: KTM carb overflow issue
PostPosted: Sat Sep 02, 2017 4:18 pm 
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GOR Assisted Living
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Location: Flowery Branch, GA
You know that gas can you leave sitting in the garage sealed tight and it blows up like a balloon? That could be happening with a check valve on your fuel cap putting pressure inside the tank. Check the gas cap and try a regular vent line.

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- c bob

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 Post subject: Re: KTM carb overflow issue
PostPosted: Wed Sep 13, 2017 10:54 am 
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I encountered an issue in the past where the float would slide over and get caught on rough casting on the inside of the hinge where the float pivots on the pin. check the edges of the float hinge for wear/witness marks.

I also had a case where the brass fitting that guided the float needle to the seat had built up enough corrosion and or gunk that it would not slide perfectly free, maybe try sliding the float needle in and out and feeling for resistance.

I took a small round-file and very gently worked the inside of the fitting, upside down so any gunk/brass did not fall onto the seat and cause any other problems and being careful not to go too deep and gak the seat itself. Then blew it out with compressed air and brake clean from the gas in side. The Q-tip suggestion might do the same.

A simple test for your float that I often forget about is to leave it in a container of fuel overnight and see what happens. I have no personal experience with this but have heard of one node of a float sinking or half sinking and the other side still working making the floating force weak.

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