Piaggio CM1102035 Variator Roller Kit Ø19x15.5 mm 5.3 g – 50cc 4T and Purejet Scooters

The variator rollers — officially listed as roller kits — are the six small cylinders that centrifugal force pushes outwards to open the drive pulley: they are what make an automatic scooter "change gear." Original Piaggio kit of 6 pieces, Ø 19 x 15.5 mm and 5.3 grams each, orange body with internal metal bushing. Product code CM1102035.

✓ Strengths

• Original Piaggio spare part – the same code that the official spare parts catalog indicates at position 4 of the Drive Pulley, Engine group table.
• Weight 5.3 g, standard weight – this weight determines the RPM at which the variator engages: with original rollers, the calibration remains as designed, including acceleration and speed.
• Complete kit of 6 pieces – a single order covers the entire variator: rollers are always replaced all at once.
• It's the part that restores initial acceleration to a 50cc scooter – when they become oval, the scooter starts sluggishly, revs up without pushing, and no longer reaches full speed.
• A single code for five brands – Piaggio, Vespa, Aprilia, Gilera, and Scarabeo, from historical catalogs up to 2026.

Technical specifications

Vehicle compatibility

The list is taken from the official Piaggio/Aprilia spare parts catalog (B2B area). If you have any doubts, send us your scooter's VIN and we will verify the correct code for you.

The complete transmission service

This is not a commercial suggestion: the official catalog has a specific table, Transmission Kit, in the Maintenance group, and these rollers are at position 4. The other three lines are 1R000436 Transmission Kit, 842907 V-belt, and 289931 Slider (three per vehicle). With the crankcase already open, changing them together costs little extra labor and is the way the manufacturer intends for maintenance to be performed.

Perfect for whom

It's the spare part for anyone with a 50cc scooter that no longer performs as it used to: it starts slowly, doesn't reach its former speed, the engine revs without pushing, or it vibrates at half acceleration. These are the symptoms of ovalized rollers, the most common defect on these scooters and also the cheapest to fix. It's also an essential part of the transmission service, which a workshop performs along with the belt and sliders: it's the maintenance that restores a 50cc scooter to factory performance for very little cost.

Frequently asked questions

How many rollers are in the package?
Six, which is the complete set for one variator: the official catalog provides for 1 kit per vehicle. There is no need to order two. Rollers should always be replaced all at once, because six pieces of different wear will cause the pulley to operate unevenly.

What are their size and weight?
Ø 19 x 15.5 mm and 5.3 grams each. The weight is the data that really matters: it determines at what RPM the variator starts to open. These are the original rollers of the weight specified by the manufacturer, so acceleration and speed remain as designed.

How do I know they need changing?
The scooter has less initial acceleration, no longer reaches its previous speed, the engine revs without pushing, or there are vibrations at half acceleration. When disassembled, the rollers appear ovalized or stepped instead of perfectly cylindrical: at that point, they no longer slide in the guides.

Where exactly are they located on the vehicle?
Inside the variator, in the transmission compartment behind the crankcase on the left side of the engine: they sit in the six guides of the movable half-pulley. In the official catalog, they are position 4 of the Drive Pulley table, Engine group.

Do I also need to change the belt and sliders?
That's what the manufacturer recommends: on the Transmission Kit table, the rollers are listed together with the belt 842907 and the sliders 289931, three per vehicle. The crankcase to be opened is the same, and the three spare parts have a similar lifespan, so it's convenient to do everything at once.

Do they change the scooter's performance?
No: these are original rollers, with the weight specified by the manufacturer. They return the scooter to its new condition, they do not modify it. Those looking for quicker acceleration or higher top speed must install rollers of a different weight, and these are specific aftermarket kits: not this code.