OP
@mrnice13 avatar
UTC

Enthusiast
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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Location: Switzerland
 
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@mrnice13 avatar
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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Location: Switzerland
UTC quote
Hi

I have the CVK Keihin carburetor on my Fly leader engine and I suspect problems with it no power after 30 mph and I disassembled it yesterday and the membrane has one or two holes and one of the screws of the tank is eaten so I can not check the jets. Would you have an idea of replacement for the carburetor or if someone has one not too expensive.

Thank you
OP
@mrnice13 avatar
UTC

Enthusiast
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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Posts: 75
Location: Switzerland
 
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@mrnice13 avatar
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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UTC quote
Does something like that could work ? The 24 mm one. Actually I think I have the CVK 2600a so it's 26 mm.
Forum member supplied image with no explanatory text
@motovista avatar
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Veni, Vidi, Posti
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UTC quote
You can buy the diaphragm and use small needlenose vice grips to grab and start the screw. Once you get it out, replace all the screws with allen screws. You will appreciate it next time you decide to get inside the carburetor.
OP
@mrnice13 avatar
UTC

Enthusiast
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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Posts: 75
Location: Switzerland
 
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@mrnice13 avatar
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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UTC quote
Thanks but I can't find a diaphragm to be delivered in Switzerland better off buying a new carb all in one. I just got the choke to figured where is plug.
@aiosi avatar
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Hooked
2005 Vespa PX 150 Serie America #107 of 500
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Location: Houston, Texas USA
 
Hooked
@aiosi avatar
2005 Vespa PX 150 Serie America #107 of 500
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Location: Houston, Texas USA
UTC quote
MrNice13 wrote:
Thanks but I can't find a diaphragm to be delivered in Switzerland better off buying a new carb all in one.
I was trying to find a re-build kit for a pre-leader ET4 and ScooterWest told me they are unavailable.
I don't know if it's the same for your model engine.
@juan_orhea avatar
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Molto Verboso
S150 '09, Beo 500ie '08
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Molto Verboso
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S150 '09, Beo 500ie '08
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UTC quote
You didn't mention having looked at SIP. If you're in Europe and SIP can't help you…help may not be possible.

SIP-Scootershop.com specifically suggests the inexpensive Naraku carb that Mr. Nice showed for the ET4.

https://www.sip-scootershop.com/en/category/modern-vespa_3/tuning_1177/vespa-et4-125-150_T11/carburettor-manifold-reed-valve_2156/carburettor-carburettor-kits_3572?f-Artikeltyp=Carburettor&page=2
OP
@mrnice13 avatar
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Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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UTC quote
Thanks for the reply.

I find the part on ebay Deutschland for 20euros 14mm slide with the diaphragm.
But the naraku seems really good to me for the price. I wonder, seeing that he has a 105 vs 85 MJ for the Keihin if he could have a better top end. Because with the piaggio restricted air box it's lean from the start. I'm pretty sure it's better to give him more gas 😉

@motovista avatar
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Veni, Vidi, Posti
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UTC quote
Aiosi wrote:
I was trying to find a re-build kit for a pre-leader ET4 and ScooterWest told me they are unavailable.
I don't know if it's the same for your model engine.
The Pre-leader ET4 was never sold in the United States, so it's highly unlikely that a US based dealer would have parts for it.
The OP's engine is not a pre-leader et4 engine either.
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Veni, Vidi, Posti
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UTC quote
Juan_ORhea wrote:
SIP-Scootershop.com specifically suggests the inexpensive Naraku carb that Mr. Nice showed for the ET4.

Try to install one and make the bike run right, then get back to us.

The Naraku is a typical Chinese GY6 carburetor with better QC. When we had the shop, we spent hours trying to get the Leader engine to run correctly with one, because it would save everyone a lot of money. There was always a dead spot in the acceleration. I know a guy who "successfully" installed one in an S150. I rode it. Big dead spot in the upper mid range. They don't come off the pilot jet and onto the main very well. It's likely a difference in the effusion tube and/or who knows what else. OTOH, I've spoken to people in Australia who claim they can get the Piaggio engine to work with the Chinese carbs.
OP
@mrnice13 avatar
UTC

Enthusiast
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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@mrnice13 avatar
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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Location: Switzerland
UTC quote
Yeah the Keihin is a much more complex and better carb. If I can install this part and everything is golden and can get my power back I'm happy.
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Member
Gt200 2003
Joined: UTC
Posts: 19
Location: Norfolk England
 
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Gt200 2003
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Location: Norfolk England
UTC quote
These Piaggio et al scooter Keihin cvk30 carbs are a cheap and nasty version of an OK carb that is used on Harleys etc

This version is seen on lawn mowers and other agriculture machinery.

No rebuildable accelerator pumps for instance, no rebuild kits per SE available but, some Harley parts transfer over, all be it not many.
OP
@mrnice13 avatar
UTC

Enthusiast
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
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Posts: 75
Location: Switzerland
 
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@mrnice13 avatar
Piaggio Fly 125 4T 07' / Piaggio Typhoon HiPer2 02'
Joined: UTC
Posts: 75
Location: Switzerland
UTC quote
I don't think their a use for a Cvk that big on Law and agricole machinery. Normally it's a slide carb that is used for 2T machinery not 4T scooters. And just for your information some Harleys use Keihin carb.
@motovista avatar
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Veni, Vidi, Posti
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UTC quote
What is common with old Vespa carburetors and people who are "handy" with things, is that they will do one or more of the following, in no particular order:
get on the internet, get a lot of advice. Clean the carb a couple of times, send the carburetor out to be cleaned in some sort of machine, add some crap to the gas, replace the diaphragm. replace the electric choke, replace the jets, buy the $25 Amazon carburetor,

And then buy the correct carburetor for the scooter.

If there was a cheaper option out there, Scooterwest, ScooterWorks, and Scooterpartsco would all have them on our sites. That none of us do should tell you how well that $35 Vespa carburetor from Amazon will work out
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Member
Gt200 2003
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Location: Norfolk England
 
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Gt200 2003
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Location: Norfolk England
UTC quote
MrNice13 wrote:
I don't think their a use for a Cvk that big on Law and agricole machinery. Normally it's a slide carb that is used for 2T machinery not 4T scooters. And just for your information some Harleys use Keihin carb.
I know Harleys use Keihin, the clue was in my post

Yes, some of the industrial bigger ride ons use Cvk, all be they smaller venturi, we are talking 4T
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