|
|
Post by doublert on Nov 21, 2013 15:11:25 GMT -5
My brother thinks that he might need taller gears. The bike is a 50cc VIP with the large bbk I think it's the 57mm bbk, it has the performance head and A-9 cam. Right now it has 6gram roller weights with a koso variator and koso 1500 torque spring, 40 mph it's hitting 9000 rpms, we had 10gram weights in it before comfortable at 8000 rpms at 40-50 mph. Guess it needs taller gears?
thanks,
Randy
|
|
|
|
Post by urbanmadness on Nov 21, 2013 18:19:17 GMT -5
I think it needs heavier wieghts.
|
|
Freshman Rider
Currently Offline
Posts: 94
Likes: 2
Joined: Apr 1, 2013 12:00:42 GMT -5
|
Post by Mainely Scooters on Nov 21, 2013 20:38:34 GMT -5
Weights really only affect the acceleration curve. Depending on your variator, a thicker roller (or a slider) can possibly push the variator out a tiny bit more, pushing the belt closer to the edge, giving you a slightly higher top end.
My suggestion is to open up the CVT and put an ink mark across the variator face, close it up, then top it out. You can see how high the belt is riding up the variator face. If its not getting to within 1/4" of the edge, you have room to grow, so to speak.
The variator drive boss is the cylinder between the variator and the drive face. You can shave it down to allow the variator to push closer to the drive face, giving you better top end.
A few things to watch out for:
1. Nicking ANYTHING.
2. Placement of the drive face in relation to the starter bendix. If you take too much off the drive boss pin you can get it out of alignment and it will make a terrible racket when trying to start. You will damage something if you don't readjust.
3. Tightness of the variator face. Some crankshafts are not threaded enough to allow the assembly to be tightened if the boss pin is too short. Measure and make sure of that.
If you do take off too much from the boss you can put a thin washer behind it (if you can find one the proper size).
Try this first as it is much easier to do before breaking open the rear casing to get to the gears.
Greg
|
|
