Will the gearsets from 90/100cc Minarellis fit the 50cc?

[dcdirtrider]

Hello there, 

Recently picked up a 2000 Minarelli SR50 LC for $400, and slowly throwing parts at it. I'm kinda trying to build a budget oriented 60mph scoot. I have already ordered a 70cc kit, Motoforce Racing belts and crank, 17.5 carb, variator weight kit, cheapo sports exhaust, carbon reeds, and clutch/contra spring kit. Also replaced the airbox snorkel with a larger custom 3d printed unit.  My question is, will the gearbox/gearsets from the ATV 90cc engines or BWS 100 engines fit in the 50cc Minarelli? From my understanding, they have about 30% longer gearing than the SR50, and can be found for around $40 shipped. 

Yes, yes, I know you can buy primary/secondary gearsets from Malossi/Polini, but they're $100ea. This is a cheap, old, worn out scoot, that came from a tow lot, and I'm trying to make fast for cheap. It's not pretty, and all I'm looking for is info on whether the 90/100 gearsets fit the 50 engines. Thanks!

[190mech]

None of the Chinarelli gear sets will work, possibly the Yamaha brands will..

[dcdirtrider]

Apr 8, 2024 3:26:31 GMT -5 190mech said:

None of the Chinarelli gear sets will work, possibly the Yamaha brands will..

What's different about the Chinesium clones? I'm assuming the ATV engines are of the Chinese variety?

Here's a pic of the gearset I found on AE. Unfortunately, trying to find measurement diagrams is a bit difficult to verify compatibility. Says it fits the Yamaha BWS 100.