Gear Up kit question

the primary gear up kits sold adjust the final drive ratio if i am correct, usually fitted when you add a 70ccm bore kit for that extra speed.

Can you add a gear up kit to a de-restricted scooter and see a gain in top end speed, adding slightly more heavy rollers and some what loosing that low end pull off but gain a higher top speed at the same rpm you max out with on stock gearing.

lets say you top out at 47mph and you pinning the throttle between 8,800rpm and 9,200rpm, the motor would rev higher but your some what governed by the rear final drive ratio from that stock gearing, could the gear up kit make a difference so instead of 47mph flat out you could gain around 55mph flat out and not have to rag that little motor so much ?

i am used to geared bikes, ie swap out front sprocket for a larger and the rear for a smaller toothed sprocket, does the same go for scooters, you loose that little bit of low end accel but gain from a higher top end speed. ?

 

You really need more power to pull a gear kit (70cc), a 50 may struggle against higher head winds, so throttle wide out all the time ! But try it if you want!

 

thank you marsh

I did a lot of interweb searches on gear ups, and came to conclusion that the poor old small bore 50cc just would not pull that higher ratio. be falt as a pancake at take of speeds and struggle to top out at max ratio on the rpm and power it produced 3.5 -4ps for my bike.

i have also looked into a 70cc bore kit to , but trying to get it registered legal is a headache in its own right. my bike is the same chassis used in the 100cc sym jet yet i would still need a vosa test to say the bike is upto scratch for road use, same goes for swapping out my motor for the 100cc twostroke motor, again it has to be fully re-registered as a moddified bike as its a differnet motor fitted as in VIN/engine number matching.

so have decided to just stick with the standard de-restriction but try and gain some more lower end pull ( chop the expansion chamber cone and have its restriction removed (leo vince tt).