Well, I am going to start making a habit of posting all the mods I do to my scooter. With step by step instructions on how I did it, and the results of my work. First of all, let me start with the general disclaimers.
1. If you haven't de-restricted your scooter, Click here to see how to do it here : http://www.apriliaforum.com/forums/s...&threadid=8617 Also, if you are curious as to how roller weights, variators and contra springs work, Click here: http://www.apriliaforum.com/forums/s...3637#post63637
2. If you tamper with the motor in any way to de-restrict it, some dealers will completely void your warranty. So make sure this is a sacrifice you are willing to make.
3. ALL bolts and socket head cap screws are in metric! Don't try to work on your vehicle if you don't have metric tools, you will just end up messing up the heads.
4. This entire installation (Although it seems rather complex), took me only about 1 1/2 hours to complete from start to finish. It is rather simple to do, but it is a bit involved.
This posting is how to install new rear end gears.
The purpose of these gears is to give you more top end, while at the same time not changing your acceleration. The peak horsepower of you engine is generated at about 8000-8500 RPM. Stock, you are doing about 8500 RPM at 40-45MPH. From then on, you are increasing your RPM's, and decreasing your horsepower. The gearing just uses the full potential of your variator, and makes it so when you are at 8500 RPM your peak horsepower, you will be going 50-55 MPH instead of 40-45 MPH.
Lets Get Started!