Vital Question For Vital Mechs

Anonymous (not verified)
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Anonymous (not verified)
My 2015 Yamaha is leaking fuel out the carb overflow when the fuel is on. I'm sure it is the needle and seat. I see the needle for sale on the schematic, but does that include the needle seat?
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kb228
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kb228 3/5/2018 2:53pm
3/5/2018 2:53pm
I would make sure your seat is sealing before you go replacing it. If it seals then you just need to adjust your float height
mattyhamz2
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mattyhamz2 3/5/2018 2:53pm
3/5/2018 2:53pm Edited Date/Time 3/5/2018 2:55pm
yz125? yz250?

If it's a YZ250, looking at the parts fiche it's just the needle. The seat doesn't look to be sold separately
If it's a 125 then yes it is sold as a set
DTHA70
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DTHA70 3/5/2018 3:25pm
3/5/2018 3:25pm
if its a keihin then youre not gonna be able to replace the seat. Mikunis you can do both.

I would air check the needle to ensure its wrong first and possibly adjust float height to remedy the leak.

did this leak happen suddenly or after sitting for a long time?
Harry Backmon 3/5/2018 3:53pm
3/5/2018 3:53pm
Thanks guys. It has been sitting for a bit. It's a smoker 250 with the Keihin carb.

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b8res
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b8res 3/5/2018 4:02pm
3/5/2018 4:02pm
Anonymous wrote:
My 2015 Yamaha is leaking fuel out the carb overflow when the fuel is on. I'm sure it is the needle and seat. I see the...
My 2015 Yamaha is leaking fuel out the carb overflow when the fuel is on. I'm sure it is the needle and seat. I see the needle for sale on the schematic, but does that include the needle seat?
Give this a look... hope this helps.

https://www.jetsrus.com/carburetor/carb_keihin_PWK33-41_carb_exploded_v…
lumpy790
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lumpy790 3/5/2018 5:17pm
3/5/2018 5:17pm
In almost 40 years as a MC mechanic I typically only needed to clean debris out of the carb and seldom had to replaced parts.
Pirate421
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Pirate421 3/5/2018 6:26pm
3/5/2018 6:26pm
Tap the body of the carb with blunt end of a screwdriver and see if it stops
lumpy790
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lumpy790 3/5/2018 7:12pm
3/5/2018 7:12pm
Has the bike been sitting for a while?
slipdog
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slipdog 3/5/2018 7:13pm
3/5/2018 7:13pm
Check to make sure there's not a styrofoam peanut stuck in the float bowl.

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