Carb question

BUTCH
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USA
Edited Date/Time 1/25/2012 9:54pm
I have an 02 kdx200 and the carb leaks gas while sitting with the gas petcock on. 2 quetions,
#1 Do the plungers ever go bad?
#2 Is there somekind of rubber seal ring that fits up inside the pluger cylinder?
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6/16/2009 5:25pm Edited Date/Time 4/17/2016 12:27am
What you need to look at is the needle & seat inside the carb. Remove the float bowl and then remove the pin that holds the floats to the body the needle & seat is right above it.
BUTCH
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6/16/2009 5:40pm
Wrench , what would be the common thing to look for there? What ajustment do I make there? Thanks btw
6/16/2009 6:33pm
There's no adjustment, it either works or it doesn't.

look to see if it's rubber tipped, if it is... they almost never go bad and probably just have some corrosion or dirt in there.
BUTCH
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6/16/2009 7:40pm
Yes werx, it is rubber tipped, the bike has been sitting for a long ttime with no gas in it. I thought maybe the rubber had hardend and it no longer seals when the float pushes it up. I took the carb off the bike and took the bowl off and the float pin out, removed the float and blew eveything out with some air and put it back together and it still leaks. That's why I asked about the plunger, if they ever go bad.

The Shop

09450f
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Temecula, HI, USA
6/16/2009 9:52pm
thats a common problem with bikes sitting round....its your inner hate for 2 strokes..you let it die!
6/17/2009 6:10am
There is an adjustment on the float level but not on the needle and seat. It can leak if the rubber tip is woren or grooved or it can leak it it is misaligned.
lumpy790
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York, SC, USA
6/17/2009 7:35am
Typically no parts are needed....just a good carb clean. Then bench test before installation.
6/17/2009 12:47pm
I have seen where the aluminum of the needle corroded and also the brass of the seat.. they won't move freely in and out causing it to not seat properly. You can lightly sand both pieces to ensure proper movement.

You have to play with it to make sure it moves freely.

On some KTM models there is an o-ring under brass seat. Does it have a screw holding the seat in carb? Might look at that. I've used a hardware store o-ring to fix those problems.
davis224
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Cornland, IL, USA
Fantasy
6/17/2009 7:36pm
In my experience needles are very often replaced. It's cheap, get a new needle, It's most likely your problem. To make sure do what they said above, look at it for the tiniest wear marks, grooves, a line where it seats, etc.
Cygnus
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Hanover, CO, USA
6/18/2009 6:16am
JUst by a new needle and seat. I have seen many go bad. This shit we call gas nowadays eats the rubber seal up.

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