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15 Posts
On a 2001 400ex keihin carb, is the float valve seat pressed in or will it come out ?
float valve seat
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5,072 Posts
@SlammedRanger is the man to answer this question accurately however, I believe all keihin carb needle valve seats are pressed in. You can buy replacements but you need to machine the original out to fit the replacement.
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4,390 Posts
Man its been a few years since i had the bowl off a 400ex carb. But what i do know. FCR mx39 i run on my quad does have a removable seat. It has a phillips screw holding the edge of it down. That being said if the 400ex has a phillips screw around the edge of the seat it will more than likely be holding it down aswell. But my memory is telling me it dosnt and its pressed in.
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4,390 Posts
A quick google search confirmed my answer. 400ex carb is a press in needle valve seat.
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15 Posts
thanks to both of you, a buddy at work is bringing me a used carb off a 400 ex his friend had, so hopefully I can solve this overflow leak.
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5,072 Posts
Have you tried an OEM needle valve to cure the leak? I tried several aftermarket brands on a 300 fourtrax and had no luck, bought OEM and the issue was solved.
You could also try using a very light cutting paste and a cotton bud. I have used toothpaste in the past which worked well and cured the overflow issue.
You could also try using a very light cutting paste and a cotton bud. I have used toothpaste in the past which worked well and cured the overflow issue.
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4,390 Posts
Your welcome! Im sure you can get it. I have used acitone on a q-tip. And that carb was in such bad shape i thought there was no hope as soon as i pulled the bowl off. There was an inprint of the float left in the bowl that was full of gummed up fuel. I had to put the whole carb in a sonic cleaner to get it but when it was all said and done it ran perfect. Get yourself a shindy carb rebuild kit and replace the needle with the one from the kit. And all the gaskets and you will be golden.
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15 Posts
follow-up I had bought an aftermarket carb kit and everything worked fine except for float valve.
Ended up buying a used carb from friend for $20 and used the float and float valve out of it. This did the trick.
Thanks guys !
Ended up buying a used carb from friend for $20 and used the float and float valve out of it. This did the trick.
Thanks guys !
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4,390 Posts
I have ran into this before aswell. The cheap kits are only good for the bowl seal and top cover gasket. Everything else is junk. I put one on and the float was literally stuck. I coouldnt move it free with my fingers so i could tell you 100% it wasnt gunna float lol. Glad you got it figured out!
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