Transmission

July 14, 2014

Welcome. Here are the main types of US-model moped transmissions. There are also manual clutch and manual shift types, and other designs like friction drive, not included here.

Many of these transmission parts are shown with the engine parts. Click those engine name links to go that section.

As of May 2016 most transmission parts are not shown or offered yet. Ask Shaun by email for parts not listed. 

Transmission Types 

Tomos chain drive

Tomos gear driven
with final chain drive


1. Gear driven with final chain drive

     a) one speed automatic

     Puch, Sachs, Minarelli, Morini

     b) two speed automatic

     Puch, Tomos, Kreidler

This type has an oil bath clutch and gears combined with the engine in one unit. 

 

1980 Peugeot

Peugeot belt driven
with final chain drive


2. Belt driven with final chain drive

    a) one speed automatic

    Motobecane, Peugeot, Batavus, Solo

    b) variable speed CVT

    Motobecane, Peugeot, Derbi

This type has a dry clutch, V-belt, and an external pulley with sprocket.

 

Vespa one speed belt drive

Vespa belt driven with final gear drive


3. Belt driven with final gear drive

    a) one speed automatic

    Vespa Ciao, Kinetic TFR

    b) variable speed CVT

    Honda PA50, Vespa Bravo/Grande/Si

This type has a dry clutch, V-belt, and oil bath gears inside the rear wheel.

 

Transmission Parts


Vespa Variator Front Pulley

Vespa variable front pulley

Vespa variator rollers

Vespa variator rollers

Vespa belt drive with variator

Vespa belt drive with variable pulleys

Vespa Variator Parts

 

 

 

 

 

Vespa variator exploded view

Vespa variator exploded view

41  points cam
42  wave washer
43  flywheel
69  variator nut
70  lock washer
71  outer plate
72  outer roller guide
73  inner roller guide
74  outer pulley half
75  center tube
76  inner pulley half
77  spacer
78  variator assembly
97  roller end cap
98  roller center
99  crank shim
100  crankshaft
101  flywheel key
106  crank bearing
107  crank seal

 

 

 

 


Table of Variator Rollers

 

Diam. Length Qty  Application

  15.0     18.0     3   Honda PA50I and PA50 II

 

  14.0     14.0     6   Honda Camino (Non US)

 

  14.4     14.0     5   Vespa Ciao, Bravo, Grande, Si

 

  14.6     19.6     3   Derbi 1974-1986

 

  14.0     13.0     6   Morini M101

 

  14.0     13.0     6   Malossi variator for Motobecane

 

  15.0     12.0     3   Aftermarket guide Motobecane (instead of balls)

 

  16.0     13.0     ?  Malossi, Polini, TJT, DR (and many chinese scooters)