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Vespa LX 150 2009
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Hello! New here. Trying to get my Vespa started after a few years. I've tried everything. She just keeps turning over but doesn't start unless I put in some carb cleaner.


09 Vespa lx 150 w carburetor
-new battery
-replaced fuel pump- fuel comes out into carb
-cleaned carburetor
-Checked vacuum
-has spark

No matter what I try she won't start.

It seems like fuel isn't getting to the carburetor. I left her sitting for a week and when I went to take off the fuel line it had turned orange. Is there a way to clean the carb fuel intake??

I want to avoid buying a whole new carburetor I really can't afford it.

It's a keihin cvek-2601a carburetor.

Any help is appreciated and I really hope it's okay to post this here
@marret avatar
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Hooked
2016 GTS300 ABS
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@marret avatar
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Welcome.

You mentioned fuel not getting to the carb and then cleaning the intake.

Carb may need to be cleaned and/or rebuilt.

Did you remove the old fuel and fill with fresh?

Did you replace the fuel lines?

Have you confirmed the fuel pump is working?
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Well I did the carb cleaning myself. Watched a video, followed all the steps. But from all the steps I did see, the fuel opening for the carb from the fuel pump never got a cleaning part in the video? Just the jets, float, all the other pieces.

And I can't find one online.

And yes I did everything else you mentioned

Thank you
@marret avatar
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2016 GTS300 ABS
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So you got fuel to come out of the fuel line where itconnects to the carb?

I have not worked on a Vespa carb, but have you tried spraying carb cleaner in that opening?

Anyway to use a pipe cleaner or something similar to clean that opening?

Sounds like it might need a good soak in parts cleaner. Don't think I would throw in the towel and buy a new carb yet. Maybe someone more knowledgeable will come along.
@berto avatar
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Molto Verboso
2006 LX150 (carbed) | 2007 GT200
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Molto Verboso
@berto avatar
2006 LX150 (carbed) | 2007 GT200
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Is everything connected correctly? Maybe post some photos?

Do I understand correctly that the bike ran fine before you parked it?

I'm confused about your statement that fuel is getting to the carb, but then later you said It seems like fuel isn't getting to the carburetor?
@jimc avatar
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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@jimc avatar
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Maybe he means the fuel is getting TO the carb, but not getting IN it.

Perhaps the needle valve on the input needs unsticking. BTDTGTTS.
@rob_g avatar
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I would start over. Start at the back. Make sure fuel is getting from the tank to the hose that attaches to the carb. Clean the carb again. You need to make sure the idle jet and the main are clear. Just cleaning out the bowl is not enough.

You can get some really inexpensive tools off Amazon that you can push into the jets to clean them out. Soak everything. Then when it's all back together put in some Seafoam. I just used it on a rough running gts that had been sitting 2-3 years and it was purring in under 10 minutes with 150% of the recommended dose.

It'll take a bit of elbow grease but YOU WILL have that bike running great again.
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Vespa LX 150 2009
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jimc wrote:
Maybe he means the fuel is getting TO the carb, but not getting IN it.

Perhaps the needle valve on the input needs unsticking. BTDTGTTS.
Yes! It seems like that's the part the fuel is stuck on. Cause when I cleaned it and put it back together the carb was still empty after my attempts.


Where is the needle valve?
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berto wrote:
Is everything connected correctly? Maybe post some photos?

Do I understand correctly that the bike ran fine before you parked it?

I'm confused about your statement that fuel is getting to the carb, but then later you said It seems like fuel isn't getting to the carburetor?
Yes bike ran fine. And I meant fuel goes into the carb from the fuel line but it doesn't seem like the carb is receiving the fuel inside.

I'll post pics tomorrow!
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Vespa LX 150 2009
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rob g wrote:
I would start over. Start at the back. Make sure fuel is getting from the tank to the hose that attaches to the carb. Clean the carb again. You need to make sure the idle jet and the main are clear. Just cleaning out the bowl is not enough.

You can get some really inexpensive tools off Amazon that you can push into the jets to clean them out. Soak everything. Then when it's all back together put in some Seafoam. I just used it on a rough running gts that had been sitting 2-3 years and it was purring in under 10 minutes with 150% of the recommended dose.

It'll take a bit of elbow grease but YOU WILL have that bike running great again.
I'm gonna try and soak the carb but I need more carb cleaner and a bigger jug. I'll update 😮‍💨😤😤
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Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
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@greasy125 avatar
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when you say you've rebuilt the cleaned the carb, do you mean you've broken it down all the way to the little itty-bitty parts and soaked it, then followed up with some type of cleaner and finally blew out all the passages and jets with compressed air? or did you just hose it down with carb clean?

because you really need to strip them down and dip them and blow everything out. if the jets aren't clean and the passage ways clear you'll just continue to fight it.

as above, I'd double check the needle valve.

also, did you drain out the old gas? if not, 100% you need to do that and flush the tank.
@motovista avatar
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Veni, Vidi, Posti
GT 2.4
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A new Vespa carb is $200. I had a shop. We had a big container of Yamaha carb cleaner (probably the best) and a technician who had been working on scooters since the early 1970s. We replaced carbs even after he'd taken them apart, soaked them, cleaned them off, put them back together, etc.
Ride your Vespa or try to figure out workarounds to buying a new carburetor. The choice is yours.
Here's a link to the carburetor for your scooter.

https://scooterpartsco.com/lx-150-air-and-fuel-c-3637_3646_3866/carburetor-for-vespa-lx-150-cm129214-p-13957.html
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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@jimc avatar
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Splurginsure wrote:
Where is the needle valve?
Somewhat hidden, it's the bit the float actuates. Even though there's a spring the needle will stick if it's got gummed up. You need a small diameter drift to take this bit apart - a small pop-rivet is the perfect size.
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2018 Vespa GTS300
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2018 Vespa GTS300
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jimc wrote:
Somewhat hidden, it's the bit the float actuates. Even though there's a spring the needle will stick if it's got gummed up. You need a small diameter drift to take this bit apart - a small pop-rivet is the perfect size.
sdjohn broke a carb trying to get this pin out so be careful Splurginsure

From https://modernvespa.com/forum/post2607178#2607178
Here you can see the needle valve location and broken pin support.
External inline image provided by member with no explanatory text
OP
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Member
Vespa LX 150 2009
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UTC quote
jimc wrote:
Somewhat hidden, it's the bit the float actuates. Even though there's a spring the needle will stick if it's got gummed up. You need a small diameter drift to take this bit apart - a small pop-rivet is the perfect size.
when I did the first rebuild I didn't see that in the video I watched. But once I cleaned that part I got fuel into the carb by doing the wire trick!

So I finally found the specific issue…. On the other hand I tore the gasket for the fuel reservoir. Wha? emoticon slowly but surely gonna get her started. Thanks everyone
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