As soon as the original SHB has to make way for another carburetor in your Smallframe, the question arises at the latest shortly before the engine is started for the first time: how do I operate the choke? How do I convert the carburetor from a folding choke to a cable choke? How do I connect the cable choke of a Dellorto PHBH, VHST, Mikuni, Keihin PWK or Polini CP carburetor to the choke lever of the Smallframe?
Many carburetors are usually supplied with a so-called folding or pull choke. To ensure that the carburetor can be operated with a cable choke as is typical for Vespa, we offer the right adapter set for conversion for many carburetor types.
2599091 Dellorto PHBL, PHBH VHST (Shop)
2599098 Mikuni, Keihin and Polini CP (Shop) The bgm Pro choke lever is suitable for all carburetor types that are equipped or retrofitted with a cable choke. Thanks to the special design of the bgm Pro choke lever, the choke cable can simply be unhooked to remove the carburetor. This saves time and is easy on the hands in the cramped carburetor compartment of a smallframe. By using a clamping nipple, the choke cable is not kinked every time the choke lever is operated and is therefore permanently durable and secure against tearing off. Thanks to the adapted contour of the lever, it can no longer jump out of the choke button guide. Fitting the bgm Pro choke lever is simple. A YSN30 / Dellorto PHBH (YSN8570 ) carburetor
(blog) with the matching cable adapter set (2599091 -
(Shop). The choke cable is the universal cable
BGM6445 is used as the choke cable. This already has the right length of outer casing to fit in a Vespa Smallframe. Loosen the nut of the small inner choke lever with SW10 and make sure that the screw does not fall out downwards towards the carburetor chamber. When removing the original choke lever, pay attention to the curved washer (
3330468W), which is located between the choke lever and the retaining plate on the frame. This will also be needed again later. Insert the screw from below through the retaining plate and then fit the spring washer and the choke lever. The nut has a so-called clamping part to prevent it from loosening automatically. This clamping part can be recognized by the marks on the wrench flats of the nut. Depending on the design of the nut, this clamping part is located on one end face or on the wrench flats. When fitting the nut, make sure that the clamping part of the nut is facing upwards so that the non-clamping part is turned onto the choke bolt first. First tighten the nut until the choke lever can still be moved easily. The inner cable is first passed through the adjusting screw and the adapter with the barrel first and then pushed through the spring. The barrel of the cable is hooked into the choke piston. When inserting the choke piston into the carburetor, make sure that the barrel does not jump out of the choke piston holder. The adapter is then screwed to the carburetor.
The clamping nipple is now placed on the loose end of the choke cable and secured at a distance of 20 mm from the end cap.
First thread the inner cable into the slotted guide of the choke lever and then hook the clamping nipple into the choke lever. Use the end cap to pull back the outer casing (the choke in the carburetor is actuated in the process) until the end cap can be hooked into the retaining plate.
If the play in the choke cable is too great, this can be easily adjusted using the adjusting screw on the carburetor adapter. A minimum safety clearance of approx. 1.5 mm should be maintained between the shoulder of the end cap and the abutment of the retaining plate on the frame so that the cable is not tensioned and the choke is not actuated during compression and engine movements while riding. If the necessary safety clearance of the cable cannot be achieved via the adapter, the adapter on the carburetor is turned back again and the cable is adjusted by tightening the clamping nipple. Finally, tighten the nut on the choke lever until the lever can still be operated easily but the spring force of the spring for the choke piston cannot pull it back again.
To the choke lever bgm 
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