RLC says:
"Until now, it has been impossible to get the gearing right on Lui and J50 scooters that have been tuned or fitted with the Casa 75cc conversion kit (or with engine capacities up to approx. 100cc). The Casa 75cc kit is a best seller with a specific exhaust and carb kit having been designed to complement the kit. The proverbial fly in the ointment has always been the gearbox as original 50cc gearing is all over the shop with 1st and 3rd being far too short and all improvements you might have made elsewhere in your motor thus end up make minimal improvement thanks to the awful original gearing ratios.
This 3-speed cluster is designed for later production J50 models and all Lui 50cc models. The beauty of this cluster is that it is designed to mesh directly with the original Innocenti 58-53-46 loose gearbox cogs already found in these models, thus enabling you to obtain perfect gearing ratios but without having to incur the cost of having to change a whole gearbox!
The teeth on this cluster are : 10-15-19
This is the complete list of all possible front drive sprocket & clutch crownwheel sprocket combinations for all J-Range and Lui-Vega-Cometa models, complete with the required length chain (with 'live' product links):
45T Clutch Crownwheel Sprocket
45T clutch sprocket + 11T front sprocket = 73 link chain
45T clutch sprocket + 12T front sprocket = NO!
45T clutch sprocket + 13T front sprocket = 74 link chain
45T clutch sprocket + 14T front sprocket = 74 link chain
45T clutch sprocket + 15T front sprocket = 75 link chain
45T clutch sprocket + 16T front sprocket = 75 link chain
46T Clutch crownwheel sprocket
46T clutch sprocket + 11T front sprocket = NO!
45T clutch sprocket + 12T front sprocket = 74 link chain
46T clutch sprocket + 13T front sprocket = stretched 74 link chain
46T clutch sprocket + 14T front sprocket = 75 link chain
46T clutch sprocket + 15T front sprocket = 75 link chain
46T clutch sprocket + 16T front sprocket = 76 link chain
47T Clutch crownwheel sprocket
47T clutch sprocket + 11T front sprocket = 74 link chain
47T clutch sprocket + 12T front sprocket = stretched 74 link chain
47T clutch sprocket + 13T front sprocket = 75 link chain
47T clutch sprocket + 14T front sprocket = NO!
47T clutch sprocket + 15T front sprocket = NO!
47T clutch sprocket + 16T front sprocket = 76 link chain
JBS recommends this cluster to be used in conjunction with a 15T front sprocket"
Product safety information
Manufacturer information:
Rimini Lambretta Centre
Via delle Industrie 13
47824 Poggio Torriana
Italien
info@riminilambrettacentre.com
https://www.riminilambrettacentre.com