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 Carburetor/fuel problem 
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Post Re: Carburetor/fuel problem
The vacuum line is blocked by the petcock, which is a shutoff valve.

You can tell whether it's working by sucking on it with the fuel line disconnected. If fuel comes out while you suck and then trickles to a stop, it's working.

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'05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Leo Vince HM 70 pipe, silencer from ZX-R (1-1/2" longer); stock airbox no snorkel, 5 x 1/2" holes; Stage6 21mm racing PHBG, 45/95/W7 1 lean/40 slide; Polini/Power One 12mm HPC crank; Athena 42/14 straight cut gears; 107mm Malossi Delta clutch, ± 5800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi Overrange kit, red contra and 36G Dr. Pulley sliders; VForce 3 reeds; Michelin Bopper tires; RFY shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.


Tue Dec 14, 2010 8:34 pm
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Scooterologist

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Post Re: Carburetor/fuel problem
I blew air on the fuel line with my mouth. Not clogged I hear the bubbles in the tank. But this one is clogged. Can't blow air in it or suck air on it. So Idk if the peacock thing under the tank is clogged or its supposed to work like that ( I doubt it)

My fuel line trickes drops until it stops

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Tue Dec 14, 2010 9:29 pm
Profile YIM
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Post Re: Carburetor/fuel problem
There is a small screw under the bowl of the carburator. It's the drain for the bowl. If all hoses are hooked up; you need to backout the drain screw a little. If gas is coming out, than you are getting gas at the carb.
Have your tried unplugging the autochoke? Don't remove it, just unclip the wire.


Last edited by 1X2 on Tue Dec 14, 2010 10:07 pm, edited 1 time in total.



Tue Dec 14, 2010 10:00 pm
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Post Re: Carburetor/fuel problem
Nick Batzdorf wrote:
The vacuum line is blocked by the petcock, which is a shutoff valve.

You can tell whether it's working by sucking on it with the fuel line disconnected. If fuel comes out while you suck and then trickles to a stop, it's working.

Nick,
Why is it that you always get the questions that involve sucking and blowing in hoses? :hfive:


Tue Dec 14, 2010 10:03 pm
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Post Re: Carburetor/fuel problem
Because nobody asks about petcunts.

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'05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Leo Vince HM 70 pipe, silencer from ZX-R (1-1/2" longer); stock airbox no snorkel, 5 x 1/2" holes; Stage6 21mm racing PHBG, 45/95/W7 1 lean/40 slide; Polini/Power One 12mm HPC crank; Athena 42/14 straight cut gears; 107mm Malossi Delta clutch, ± 5800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi Overrange kit, red contra and 36G Dr. Pulley sliders; VForce 3 reeds; Michelin Bopper tires; RFY shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.


Wed Dec 15, 2010 1:01 am
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Post Re: Carburetor/fuel problem
1X2 wrote:
Why is it that you always get the questions that involve sucking and blowing in hoses? :hfive:


Because he is the forum expert. :whip:

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Wed Dec 15, 2010 2:05 am
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Post Re: Carburetor/fuel problem
Well, yodeling into the fuel line wouldn't work.

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'05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Leo Vince HM 70 pipe, silencer from ZX-R (1-1/2" longer); stock airbox no snorkel, 5 x 1/2" holes; Stage6 21mm racing PHBG, 45/95/W7 1 lean/40 slide; Polini/Power One 12mm HPC crank; Athena 42/14 straight cut gears; 107mm Malossi Delta clutch, ± 5800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi Overrange kit, red contra and 36G Dr. Pulley sliders; VForce 3 reeds; Michelin Bopper tires; RFY shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.


Wed Dec 15, 2010 12:23 pm
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Post Re: Carburetor/fuel problem
ok here is the first issue i see you took your autochoke/enrichment circut off


did you replace the oring for the autochoke when you took it off

there are reasons why we say dont take it off getting it back on properly is one and fornicate up that oring is the other the other

if its not seated properly it wont run right and lord forbid you get a tiny spec of dirt in or bit of oring fall off when you put it back on you will plug it up

that hose you are asking about has nothing to do with the autochoke oyu need to use a hose and plow into ports insids the carb to test the autochoke

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2008 zuma dual headlight mod koso mirrors liquid cooled polini corsa kit leo vince zx stage 6 variator rally kit custom red paintFUEL INJECTEDsoon to be 100cc
2008 stella olive custom ported 177 cc kit dechromed ford tear drop tail light alive and breathing and awaiting cosmtic surgery thanks to an donkey hind quater hole cager
1985 elite 150 how long can i leave it stock


Wed Dec 15, 2010 1:11 pm
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Post Re: Carburetor/fuel problem
Yes the o-ring is there. You're right, hard to sit but is there. Clean.
Is that line a vacuum line that sucks air from the carb or tank?
What's the matter w the auto choke and it running if I unplug the autochoke still the bike won't run properly?

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Wed Dec 15, 2010 7:51 pm
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Post Re: Carburetor/fuel problem
i didnt ask if the oring was there i asked if you replaced it

meaning did you get a brand new oring and put it in

you know if you unplug the autochoke you are leaving it with the choke on always right

it needs a source of ele going to it to shut the choke off as its not realy a choke but an enrichment circut it adds extra fuel

if you are getting fuel to the carb you have a vacume leake some where on your scooter

remember with a 2 stroke even a leak in your crank seal will cause your scooter to not run right

maybe its time to try a leak down test

and like i have already said your autchoke is clocked wrong it should be covering that tit on the carb by the hose you highlighted in yellow

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2008 zuma dual headlight mod koso mirrors liquid cooled polini corsa kit leo vince zx stage 6 variator rally kit custom red paintFUEL INJECTEDsoon to be 100cc
2008 stella olive custom ported 177 cc kit dechromed ford tear drop tail light alive and breathing and awaiting cosmtic surgery thanks to an donkey hind quater hole cager
1985 elite 150 how long can i leave it stock


Wed Dec 15, 2010 8:03 pm
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Post Re: Carburetor/fuel problem
jmkjr72 wrote:

if you are getting fuel to the carb you have a vacume leake some where on your scooter

remember with a 2 stroke even a leak in your crank seal will cause your scooter to not run right

maybe its time to try a leak down test

and like i have already said your autchoke is clocked wrong it should be covering that tit on the carb by the hose you highlighted in yellow


Good advice. I was wondering why you think it's a vacuum leak w/o knowing the compression?













i


Thu Dec 16, 2010 1:05 am
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Post Re: Carburetor/fuel problem
Didnt change the oring, sorry for the misunderstanding
Carefully put it back and covered that tit, that pic it was googled for didactic purposes
Mine is covered and seems like it doesnt make a difference

I need to know what the yellow line does

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Thu Dec 16, 2010 1:35 pm
Profile YIM
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Post Re: Carburetor/fuel problem
It's the vacuum line. That's what draws fuel into the carb; sucking on it creates a vacuum, and it should cause fuel to come out the fuel line and (assuming the petcock is working properly) stop when you stop sucking.

You really should download the service manual - there's a drawing of a guy doing this exact test.

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'05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Leo Vince HM 70 pipe, silencer from ZX-R (1-1/2" longer); stock airbox no snorkel, 5 x 1/2" holes; Stage6 21mm racing PHBG, 45/95/W7 1 lean/40 slide; Polini/Power One 12mm HPC crank; Athena 42/14 straight cut gears; 107mm Malossi Delta clutch, ± 5800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi Overrange kit, red contra and 36G Dr. Pulley sliders; VForce 3 reeds; Michelin Bopper tires; RFY shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.


Thu Dec 16, 2010 3:33 pm
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Post Re: Carburetor/fuel problem
Great
That's one thing I never understood.
Are you talking about the service manual here?
Thanks Nick

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2009 Yamaha Zuma 125
2009 BMW K1200R
2000 Honda XR650L


Thu Dec 16, 2010 3:41 pm
Profile YIM
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Post Re: Carburetor/fuel problem
Yeah, it's on this site.

Go to the home page and look for the drop-down menu at the upper left.

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'05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Leo Vince HM 70 pipe, silencer from ZX-R (1-1/2" longer); stock airbox no snorkel, 5 x 1/2" holes; Stage6 21mm racing PHBG, 45/95/W7 1 lean/40 slide; Polini/Power One 12mm HPC crank; Athena 42/14 straight cut gears; 107mm Malossi Delta clutch, ± 5800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi Overrange kit, red contra and 36G Dr. Pulley sliders; VForce 3 reeds; Michelin Bopper tires; RFY shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.


Thu Dec 16, 2010 3:50 pm
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