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Fuel Pissing From Drain Hose

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Commuter_Tim
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PostPosted: 23:58 - 28 Jun 2014    Post subject: Fuel Pissing From Drain Hose Reply with quote

I somehow managed to fuck the carb on my CG after removing it to inspect/clean (originally just a minor delay with throttle response and ticking of tappets).

After a second or 2 of turning the petrol tap on, the fuel pisses out of what appears to be the end of the drain hose used to drain the float bowl before removal (the screw is as tight as it goes).

My first thought was that I managed to bung up the float needle/hole?
I don't think its the float height adjustment, as mine is plastic (not adjustable) and I didn't man-handle it that much.

I've only removed/refitted the carb 3 times so still quite new at this
It's now rain showering so I plan to give it another tomorrow.

Is there anything the mighty BCF can suggest I take a look at?

TL:DR fuel pissing everywhere, what to check on carb?
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The above post is most likely nonsensical.

I ride a Bandit 600... badly.
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Islander
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PostPosted: 00:09 - 29 Jun 2014    Post subject: Reply with quote

Float needle valve probably.
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Rogerborg
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Joined: 26 Oct 2010
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PostPosted: 09:00 - 29 Jun 2014    Post subject: Reply with quote

Still shouldn't piss out of the drain hose though, unless the screw valve is knackered. Backed it out and re-inserted?

The Mikuni carb on my copybike had two hoses on the side of the carb. One fuel, one (I believe) vent.

If I connected the wrong one to the fuel tap (and I did), then fuel did indeed piss out of the other.
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Commuter_Tim
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PostPosted: 15:03 - 29 Jun 2014    Post subject: Reply with quote

Rogerborg wrote:
Still shouldn't piss out of the drain hose though, unless the screw valve is knackered. Backed it out and re-inserted?

The Mikuni carb on my copybike had two hoses on the side of the carb. One fuel, one (I believe) vent.

If I connected the wrong one to the fuel tap (and I did), then fuel did indeed piss out of the other.


Cheers for the replies

I removed and replaced the drain screw, o ring looks OK, plus the moment the tap is turned off, the pissing stops, no delay whilst the float bowl finished draining, so seems the screw isn't the cause?

Could be spot on about the wrong hose, I'm aware of the 2 tube holes, sadly I forgot which is the petrol intake after removing, made the assumption its the brass one pointing right up?
As opposed to the air vent point towards the camera?

gonna try and refit it again now, if it fails I'm "Bus Wankered" for work tomorrow!

https://www.buyqualitystuff.com/images/motorcycle%20carburetor/PZ26-1.jpg
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The above post is most likely nonsensical.

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Commuter_Tim
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PostPosted: 18:44 - 29 Jun 2014    Post subject: Reply with quote

FIXED! Very Happy

In case anybody else with an old seized up bike encounters this.

In true Noob style, I neglected to mention the one factor that was of consequence, I had only just connected up the accelerator pump, before it was disabled.

The cause appeared to be that the valve screw for the accelerator pump (in the upper portion of the Carb that pops up next to the slide) is jammed shut, looks like someone had screwed it right in.
With it being jammed shut, the pressure backed up as the pump was depressed, and caused the petrol height to raise, along with the float, and consequently piss out the overflow pipe! (by default the arm mechanism appears to depress the pump by a few mm, probably set wrong)
Annoyingly I couldn't unscrew it, and damaged the tiny flathead slot in doing so.
So for now, the Accelerator pump can eat a bag of dicks, it is disconnected again.
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The above post is most likely nonsensical.

I ride a Bandit 600... badly.
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Old Thread Alert!

The last post was made 11 years, 224 days ago. Instead of replying here, would creating a new thread be more useful?
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