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 Post subject: Leaky float needles
PostPosted: Sun Aug 27, 2017 9:48 am 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
I seem to have fuel on the outside of my H2B carbs when the bike has been sitting, and the fuel lines empty out over a day. I thought it had leaking float bowl gaskets so I replaced those, and the bike sits on the sidestand while parked, so thought the fuel level was up to the bowl gasket line and leaked out. The fuel residue is above the float bowl gasket on the body of the carbs. But the new gaskets did nothing to fix this, so I don't understand how the fuel is getting to the outside of the carbs. So the two questions; is it possible to lap or reseat the float needles, I know you guys say the replacement float needles are crap. And how or where is the fuel coming from to get to the outside of the carbs, and above the gasket line?

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: Leaky float needles
PostPosted: Sun Aug 27, 2017 9:52 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
You may be thinking of carb rebuild kits having bad parts but in those kits, the float needles, seats, and bowl gaskets are the only parts that are good. Some guys prefer Viton tipped float needles, but my stock type work fine, as long as they don't get a ring worn on them.

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If it surges, that's normal, upshift.


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 Post subject: Re: Leaky float needles
PostPosted: Sun Aug 27, 2017 10:15 am 

Joined: Mon Feb 04, 2013 7:28 pm
Posts: 194
Location: West Coast
Fuel also gets outside when the floats are set too high and it leaks out the overflow tube and on to the floor. That should not be too much though unless the needle is not seating and the fuel is continuing to run into carb.


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 Post subject: Re: Leaky float needles
PostPosted: Sun Aug 27, 2017 10:35 am 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
So there are available float needles and seat that are ok, thanks.
The overflow tube leads to the nipple on the very bottom of the bowl, if the fuel were going out that I can't see how it could be above the float bowl gasket line, like on the bowl flange on the carb body itself.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: Leaky float needles
PostPosted: Sun Aug 27, 2017 11:04 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
John at Mid Atlantic Cycle can get any genuine Mikuni parts you need at decent prices.

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If it surges, that's normal, upshift.


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 Post subject: Re: Leaky float needles
PostPosted: Sun Aug 27, 2017 1:38 pm 
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Joined: Wed Jun 08, 2011 10:41 pm
Posts: 3489
Location: Mount Vision, NY
Image

Got mine from Parkers, they had the best price and were great to deal with.

http://www.parkeryamaha.com/mikunineedlevalvevitonandregtip.aspx

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 Post subject: Re: Leaky float needles
PostPosted: Sun Aug 27, 2017 2:50 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
Jim wrote:
John at Mid Atlantic Cycle can get any genuine Mikuni parts you need at decent prices.


John is a Kawasaki guy from way back, and one of the top suppliers of triple stuff. Looks like you can get 3 total kits for 10.00 more than just the valves from the other place, and have a spare set of bowl gaskets, and needle clips.

http://www.midatlanticcycle.com/store/i ... cts_id=229

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 Post subject: Re: Leaky float needles
PostPosted: Sun Aug 27, 2017 9:02 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
Mid atlantic looks like a good supplier, maybe the Viton needles from Parker Yamaha is what I need though, anyone know which size they are, the page lists three sizes to choose from.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: Leaky float needles
PostPosted: Mon Aug 28, 2017 3:04 am 
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Joined: Wed Jun 08, 2011 10:41 pm
Posts: 3489
Location: Mount Vision, NY
DGA wrote:
Mid atlantic looks like a good supplier, maybe the Viton needles from Parker Yamaha is what I need though, anyone know which size they are, the page lists three sizes to choose from.



You could always ask if he carries the Viton tipped ones.

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Bad decisions make the best stories.



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 Post subject: Re: Leaky float needles
PostPosted: Mon Aug 28, 2017 6:29 am 
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Joined: Wed Feb 24, 2016 5:55 am
Posts: 132
Location: Monterey, CA
viewtopic.php?f=26&t=12088&hilit=Viton


You want the 2.5 and they work really well.

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