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Carb float needles

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kramdra
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Joined: 28 Oct 2010
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PostPosted: 23:33 - 12 Mar 2014    Post subject: Carb float needles Reply with quote
Would like some advice on how to fix the carb float needles as its pissing fuel out the overflow. When they shut, they seal perfectly. They are 100% clean and the rubber tips are good. Im not sure if the needle seats are too loose from being corroded or if the floats are lacking enough buoyancy.

The floats do float - therefore they are not leaking. They move smoothly but if I tilt carb upside down, the needles seem to stick 50% of the time.

The brass needle seats were corroded but cleaned up easily with a non scratch kitchen pad.


I stripped carb again today and put the float bowls back from below with great care so that I could be sure they would not stick. Connected tank and it pissed out overflow Mad

Is this a common problem with carbs? I dont think the brass seats are removable without machining?


TL:DR = Im not sure if the needle seats are too loose from being corroded or if the floats are lacking enough buoyancy
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moonzoomer
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Joined: 01 Jul 2012
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PostPosted: 23:39 - 12 Mar 2014    Post subject: Reply with quote
If the seats or the needles are corroded they are basically fecked and must be replaced best option is to look for another set of carbs/carb. What make and model is the bike?
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bypass2
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Joined: 12 Sep 2013
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PostPosted: 23:45 - 12 Mar 2014    Post subject: Reply with quote
was you starting it when the petrol was leaking from the overflow. what position is the petrol tap in.

Last edited by bypass2 on 23:56 - 12 Mar 2014; edited 1 time in total
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kramdra
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Joined: 28 Oct 2010
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PostPosted: 23:53 - 12 Mar 2014    Post subject: Reply with quote
ON and yes, vacuum opperated tap needs engine running or other suction for fuel to flow. Im not sure how thats relevant?

moonzoomer wrote:
If the seats or the needles are corroded they are basically fecked and must be replaced best option is to look for another set of carbs/carb. What make and model is the bike?



CBR250RR, carbs are Keihin VP20


If I have to drill the seats out and get new ones machined up I will but its going to add a delay to the project Crying or Very sad
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bypass2
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PostPosted: 00:09 - 13 Mar 2014    Post subject: Reply with quote
I just thought you might have left the tap on prime which you know is a constant flow. has i said i have got the CBR 250F mc14.which I think is the same engine as yours. perhaps the carbs are worn out
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temeluchus
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Joined: 01 Oct 2008
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PostPosted: 05:30 - 13 Mar 2014    Post subject: Reply with quote
do the floats move freely on their pivots?
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kramdra
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Joined: 28 Oct 2010
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PostPosted: 10:52 - 13 Mar 2014    Post subject: Reply with quote
temeluchus wrote:
do the floats move freely on their pivots?



Yes, pivots are good.
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