Carburetor cover with throttle cable rocker STOFFI for Polini CP carburetor on Vespa Wideframe
Clever high-speed throttle diverter for Wideframe models with tubular handlebars when a Polini CP carburetor needs to open fully.
The STOFFI throttle cable rocker for Polini CP carburetors solves a typical problem with Vespa Wideframe conversions: The original throttle pulley in the tubular handlebars often does not provide enough cable travel to fully open the slide of a modern carburetor. The lever ratio of the throttle cable rocker shortens the required travel of the throttle cable. This allows the Polini CP carburetor to open completely despite the original tubular handlebars - without sacrificing the classic operation of the vehicle.
STOFFI
Polini CP
Wideframe
Tubular handlebar
Full slide stroke
What the throttle cable rocker does
shortens the cable travel: the lever transmission takes over the adjustment directly at the carburetor
full slide stroke: the Polini CP can also open completely with original tubular handlebars
ideal for wideframe conversions: modern carburetor technology can still be combined with classic throttle grip technology
Clean solution: no improvised throttle grip or cable solution necessary
The problem with wideframe tubular handlebars
Many wideframe models have an original throttle roller in the tubular handlebars. This mechanism is visually and historically just right, but only provides a limited cable travel. If a modern Polini CP carburetor is fitted, it can happen that the slide is not fully raised mechanically. The engine then does not use the entire carburetor cross-section - and the setup falls short of its potential.
Lever ratio instead of half throttle travel
The throttle cable rocker works like a mechanical transmission on the carburetor cover. The short travel of the original throttle roller is converted so that the slide of the Polini CP carburetor opens fully. This is a very sensible solution, especially for wideframe engines with modern cylinders, larger intake cross-sections or touring tuning.
Modification to the CP carburetor cover
Small modifications to the cover of the Polini CP carburetor are necessary for installation. Installation instructions are included in the scope of delivery. The modification is clearly described, but should be carried out cleanly and carefully so that the rocker works without play and the slide opens and closes reliably.
Important installation instructions
Carburetor cover must be adapted: small modification to the Polini CP cover required
Instructions enclosed: Read assembly procedure in full before modification
Check freedom of movement: Slide must open fully and close cleanly on its own
Lay the cable cleanly: without kinks, tension or chafing in the handlebar and frame area
Area of application
The throttle cable rocker is intended for Vespa Wideframe models with tubular handlebars on which a Polini CP carburetor is installed. These include the classic Italian wideframes of the VM, VN, VL and VB series, suitable ACMA models as well as various Motovespa wideframe and early largeframe models, provided the handlebars, carburetor position and installation space are suitable for the respective conversion.
Suitable vehicle models - grouped
| Vespa 125 | V1T to V15T, 125 cc, 2T AC, '48-'50 |
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| Vespa 125 | V30T to V33T, 125 cc, 2T AC, '51-'53 |
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| Vespa 125 | VM1T / VM2T, 125 ccm, 2T AC, '52-'54 |
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| Vespa 125 | VN1T / VN2T, 125 cc, 2T AC, '54-'57 |
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| Vespa 150 | VL1T / VL2T / VL3T, 150 ccm, 2T AC, '55-'57 |
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| Vespa 150 | VB1T, 150 cc, 2T AC, '57-'58 |
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| Vespa 150 GL | VGL1T, 150 ccm, 2T AC, '56-'58 |
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| Vespa ACMA 125 | 125 cc, 2T AC, approx. '51-'59 |
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| Vespa ACMA 150 GL | VGL1T, 150 ccm, 2T AC, '56-'58 |
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| Motovespa 125 N | 125 ccm, engine V56M / V60M / V101M / 542M, depending on year of manufacture and version |
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| Motovespa 125 S | 125 cc, V60MS engine |
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| Motovespa 125 L | 125 ccm, V101M engine |
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| Motovespa 150 S | 150 cc, V201M / 502M engine, depending on year of manufacture and version |
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| Motovespa 150 Sprint | 150 ccm, 04M / 04C engine, depending on year of manufacture and version |
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| Motovespa 150 GS | 150 ccm, engine 04M / 04C, depending on year of construction and version |
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| Motovespa 160 | 160 ccm, engine 09C / 09M, depending on model and installation space check |
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| Motovespa 160 GT | 160 ccm, engine 09C / 09M, check depending on model and installation space |
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Note: For Motovespa models, the frame, handlebars, carburetor position and intake environment differ depending on the year of manufacture and Spanish version. The assignment applies to suitable tubular handlebar and wideframe setups with Polini CP carburetor. If the vehicle history is unclear, please check the installation space and cover position before fitting.
Brief technical overview
| manufacturer | STOFFI |
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| Type | Carburetor cover / throttle cable rocker / quick throttle reversing system |
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| Carburetor | Polini CP |
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| Insert | Vespa Wideframe with tubular handlebars |
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| Function | Shortens the required cable travel |
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| Mounting | small modification to the CP carburetor cover required |
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| Scope of delivery | Throttle cable rocker including installation instructions |
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Conclusion
The STOFFI throttle cable rocker for Polini CP carburetors is a very sensible solution for wideframe conversions where the original tubular throttle pulley is to be retained. It shortens the necessary cable travel, enables the full slide stroke and makes modern Polini CP carburetor technology much easier to combine with classic Vespa wideframe models.
FAQ on the STOFFI throttle cable rocker for Polini CP
It shortens the required cable travel so that a Polini CP carburetor can open fully despite the original tubular throttle pulley.
Yes. Minor modifications are required to the cover of the Polini CP carburetor. Assembly instructions are enclosed.
For Polini CP carburetors. The matching carburetor cover and correct installation of the diverter are crucial.
Yes. This is exactly what the rocker is designed for: it enables the full slide stroke when using the original throttle roller in the tubular handlebar.
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