Speedfight.
With its own character.

An open filter is a valid option. It must fit the carburettor connection and clear the bodywork even when the engine and suspension move. Adjust the fuel mixture after changing it. Louder intake noise alone is not measured additional power.

In this selection, Polini 203.0097 is paired with CP 201.1901 (Ø46 mm). For the airbox option, we use the different CP 201.1902 (Ø34 mm). Plan regular maintenance and protection from direct water spray for the sports filter.

There is no single universal number for this kit. It depends on the exhaust, filter, engine condition and conditions of use. Choose jets made for your CP carburettor series; follow the manufacturer’s tuning instructions and avoid an excessively lean mixture.

The rollers supplied with the variator are a starting point. Match roller weight and springs to the engine’s operating range without making several unverified changes at once.

You cannot decide from “70 cc” on the box alone. The specific cylinder, revs, piston pin, stroke and existing crankshaft condition matter. This selection uses the standard vertical Peugeot engine with a 12 mm pin and 39.1 mm stroke. For the LC cylinder, also check crankcase fitment and head compatibility.

If wear or previous modifications are unknown, inspect the engine first. For a racing kit, plan the crankshaft, bearings and ignition together with the cylinder.

Installation and tuning, required jets, a spark plug unless selected separately, coolant for liquid-cooled engines and other materials. Check the throttle cable end and free play, choke cable routing, oil and vacuum connections on the scooter itself.

When fitting the CVT, follow the variator instructions, including the specified spacers. Add oil seals, bearings and a crankshaft after inspecting their condition. Do not neglect the brakes and tyres needed for riding.

Check this against the cylinder manufacturer’s instructions and the existing system’s condition. An oil connection on the carburettor alone does not confirm sufficient pump delivery for the conversion. We do not give one mixture ratio for all engines.

We compared model fitment using the store’s internal parts finder and Malossi, Naraku, Polini, LeoVince and Yasuni catalogues. Carburettor, manifold and filter connections were compared by size. This is a parts selection with installation conditions, not a complete engine tested on a dyno.

We do not mix parts for vertical and horizontal Peugeot engines. The 50 cm³ TT 4058 kit is confirmed here for Speedfight 2. Yasuni R and the LC head were unavailable to order when checked, so their availability limits purchase of the 70 cm³ plan.