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Pissing Petrol from Carb overflow
Topic Started: Mar 30 2018, 01:10 PM (395 Views)
eran_k
Commoner
[ * ]
Hi Again,
My saga with the carbs continues, i replaced the TPS to a brand new one (the old seem to have higher Resistance then allowed), i got 160 mains and 27.5 pilots (K&N filter and supertarpp can)
the needle is on the lowest groove.
It's a freewind built into a scrambler so i got another gas tank on it, with no vacuum petcock. every time i open the petcock the carbs start pissing gas from the overflow.
Carbs were rebuilt - i changed the fuel valve o-ring but not the valve itself.
tried with the float level but didn't help, honestly i couldn't figure out how to adjust this according to the manual.

Any ideas?

Eran
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Matts
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Noob
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Sounds like a stuck needle valve
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Rob 110
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God
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+1 for stuck float.
The floats are maybe stuck down so needle drops and fuel keeps rushing in.
Or the needle itself is damaged and not seating propely when closed.

I also had a piece of fuel hose thst had broken off and wedged itself in the hole the needle seats in, so it couldnt close fully
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Monty
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Charlie Big Banana's
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If the bike leans a lot whilst on the stand, the floats dont have a chance of sealing, so always remember to turn the fuel taps off whilst parked
If it aint sharp I can play with it
My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch

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eran_k
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Monty
Mar 31 2018, 10:26 AM
If the bike leans a lot whilst on the stand, the floats dont have a chance of sealing, so always remember to turn the fuel taps off whilst parked
It happens when the tap is open, even when the bike is straight (on the podium stand)
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Monty
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Charlie Big Banana's
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Its the float needles as others have said
If it aint sharp I can play with it
My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch

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eran_k
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just ordered new ones, hope this may also solve the others issues
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eran_k
Commoner
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Well, parts arrived i installed everything, adjusted float and the darn thing piss even more now...what else could it be.
it looks like the fuel is coming out from the smaller diameter "T" pipe which i assume is an overflow of some kind, and it's not connected to anything on my bike.

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Edited by eran_k, Apr 12 2018, 06:51 PM.
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Monty
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Charlie Big Banana's
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If its still pouring out, then I dont think you have set the float height correctly, use a clear pipe attached to the overflow on bowl, hold up, and slacken the drain screw, fuel will fill the pipe to the level in the bowl, should be in line with bowl joint

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If it aint sharp I can play with it
My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch

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eran_k
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can a wrongly setup float can cause such a bad leak?
how off can it be to allow fuel to pour like this.
should the tube i circled in the picture be open?
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Monty
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Charlie Big Banana's
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yes the tube you circled should be open and yes if the floats are set wrong fuel will piss out. Then fill the airbox and the sump if left with the taps on.

Your next job is check the float height as in the photo
If it aint sharp I can play with it
My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch

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eran_k
Commoner
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Update, the right carb was ok, the left one showed higher fuel level the required (with tap closed) when tap was opened it even raised a bit more. so i readjusted the float and now all seems well.
I also put in a pair of mains drilled out to around 170 (maybe more) and lifted the needles even more with an additional washer.
now it runs much better, i suspect it even a bit rich but it's better then lean. i'll do some miles and check the plugs.
thanks for all the good advice!
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