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Nick Batzdorf
Gold Member
Joined: Tue Jul 08, 2008 9:16 pm Posts: 11362 Location: Los Angeles area
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 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.
_________________ '05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Yasuni C16 exhaust, Buzzetti kick stand to make room for it (and Stage6 paddock stand after dropping the freaking bike because of the kick stand); 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 15/50 gears (also have 14/42s pressed into a gearbox cover, just switched back and like the 15/50s so far); 107mm Malossi Delta clutch, "racing" red springs/lighter "racing" counterweights ± 6800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi 6112811 Overrange kit, red contra and 28.2G rollers; VForce 3 reeds; Michelin Bopper tires; back to the stock shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.
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Tue Dec 14, 2010 8:34 pm |
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davecolombia
Scooterologist
Joined: Sun Nov 14, 2010 11:25 am Posts: 40 Location: Raleigh, NC
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 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
_________________ 2009 Yamaha Zuma 125 2009 BMW K1200R 2000 Honda XR650L
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Tue Dec 14, 2010 9:29 pm |
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1X2
Scooter Addict
Joined: Sat Oct 04, 2008 1:54 pm Posts: 194
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 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.
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Tue Dec 14, 2010 10:00 pm |
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1X2
Scooter Addict
Joined: Sat Oct 04, 2008 1:54 pm Posts: 194
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 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? 
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Tue Dec 14, 2010 10:03 pm |
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Nick Batzdorf
Gold Member
Joined: Tue Jul 08, 2008 9:16 pm Posts: 11362 Location: Los Angeles area
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 Re: Carburetor/fuel problem
Because nobody asks about petcunts.
_________________ '05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Yasuni C16 exhaust, Buzzetti kick stand to make room for it (and Stage6 paddock stand after dropping the freaking bike because of the kick stand); 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 15/50 gears (also have 14/42s pressed into a gearbox cover, just switched back and like the 15/50s so far); 107mm Malossi Delta clutch, "racing" red springs/lighter "racing" counterweights ± 6800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi 6112811 Overrange kit, red contra and 28.2G rollers; VForce 3 reeds; Michelin Bopper tires; back to the stock shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.
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Wed Dec 15, 2010 1:01 am |
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canyondancer
Gold Member
Joined: Tue Apr 01, 2008 9:38 pm Posts: 3241 Location: Conley, Georgia
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 Re: Carburetor/fuel problem
1X2 wrote: Why is it that you always get the questions that involve sucking and blowing in hoses?  Because he is the forum expert. 
_________________ Political Correctness is a doctrine fostered by a delusional, illogical, liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.
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Wed Dec 15, 2010 2:05 am |
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Nick Batzdorf
Gold Member
Joined: Tue Jul 08, 2008 9:16 pm Posts: 11362 Location: Los Angeles area
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 Re: Carburetor/fuel problem
Well, yodeling into the fuel line wouldn't work.
_________________ '05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Yasuni C16 exhaust, Buzzetti kick stand to make room for it (and Stage6 paddock stand after dropping the freaking bike because of the kick stand); 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 15/50 gears (also have 14/42s pressed into a gearbox cover, just switched back and like the 15/50s so far); 107mm Malossi Delta clutch, "racing" red springs/lighter "racing" counterweights ± 6800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi 6112811 Overrange kit, red contra and 28.2G rollers; VForce 3 reeds; Michelin Bopper tires; back to the stock shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.
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Wed Dec 15, 2010 12:23 pm |
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jmkjr72
Forum moderator
Joined: Thu Mar 20, 2008 5:27 pm Posts: 14822 Location: portage wi
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 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
_________________ 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
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Wed Dec 15, 2010 1:11 pm |
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davecolombia
Scooterologist
Joined: Sun Nov 14, 2010 11:25 am Posts: 40 Location: Raleigh, NC
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 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?
_________________ 2009 Yamaha Zuma 125 2009 BMW K1200R 2000 Honda XR650L
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Wed Dec 15, 2010 7:51 pm |
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jmkjr72
Forum moderator
Joined: Thu Mar 20, 2008 5:27 pm Posts: 14822 Location: portage wi
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 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
_________________ 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
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Wed Dec 15, 2010 8:03 pm |
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1X2
Scooter Addict
Joined: Sat Oct 04, 2008 1:54 pm Posts: 194
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 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
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Thu Dec 16, 2010 1:05 am |
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davecolombia
Scooterologist
Joined: Sun Nov 14, 2010 11:25 am Posts: 40 Location: Raleigh, NC
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 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
_________________ 2009 Yamaha Zuma 125 2009 BMW K1200R 2000 Honda XR650L
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Thu Dec 16, 2010 1:35 pm |
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Nick Batzdorf
Gold Member
Joined: Tue Jul 08, 2008 9:16 pm Posts: 11362 Location: Los Angeles area
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 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.
_________________ '05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Yasuni C16 exhaust, Buzzetti kick stand to make room for it (and Stage6 paddock stand after dropping the freaking bike because of the kick stand); 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 15/50 gears (also have 14/42s pressed into a gearbox cover, just switched back and like the 15/50s so far); 107mm Malossi Delta clutch, "racing" red springs/lighter "racing" counterweights ± 6800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi 6112811 Overrange kit, red contra and 28.2G rollers; VForce 3 reeds; Michelin Bopper tires; back to the stock shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.
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Thu Dec 16, 2010 3:33 pm |
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davecolombia
Scooterologist
Joined: Sun Nov 14, 2010 11:25 am Posts: 40 Location: Raleigh, NC
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 Re: Carburetor/fuel problem
Great That's one thing I never understood. Are you talking about the service manual here? Thanks Nick
_________________ 2009 Yamaha Zuma 125 2009 BMW K1200R 2000 Honda XR650L
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Thu Dec 16, 2010 3:41 pm |
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Nick Batzdorf
Gold Member
Joined: Tue Jul 08, 2008 9:16 pm Posts: 11362 Location: Los Angeles area
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 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.
_________________ '05 Zuma 50, Athena sport 70cc (12mm piston) with Polini head (.9 squish), B9ES spark plug; timing advanced about 2˚; Yasuni C16 exhaust, Buzzetti kick stand to make room for it (and Stage6 paddock stand after dropping the freaking bike because of the kick stand); 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 15/50 gears (also have 14/42s pressed into a gearbox cover, just switched back and like the 15/50s so far); 107mm Malossi Delta clutch, "racing" red springs/lighter "racing" counterweights ± 6800 RPM engagement, Stage6 Kupplungsglocke (bell - the light one); Malossi 6112811 Overrange kit, red contra and 28.2G rollers; VForce 3 reeds; Michelin Bopper tires; back to the stock shock; dual headlight wiring; C3 mirrors; Trailtech TTO tachometer and temp gauge.
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Thu Dec 16, 2010 3:50 pm |
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