Hey i had an old f4 stunt bike along time ago that had sprocket work done to it but now i have a 01 f4i now i herd that can get alot more torque with -1 +2 but my top speed will be like 100 and some other people said that i could just -1 in the front and thats all i really want, but if i do that does anyone know wut my top speed will be and if i need a aftermarket chain. i wanna hit 130


thanks alot

 

I did -1/+2 my top speed is 140-145

 

go to ebay and look up the "sumofallparts" store...they have charts and sprocket set-ups for whatever you are looking for...i just put an acceleration kit on my 900 and it's atotally differentbike...amazing

 

im just -1 inthe front and i top out at 167

 

If i drop -1 in the front do i need a new chain. Or wut about -1 +2 setup

 

If you drop a tooth your stock chain will work, if you go up in the rear it won't. I plan to just go +4 on the rear of mine and stay with the stock countershaft sprocket.

 

Changing the front sprocket was super easy. 3 bolts and the cover and sprocket are off. -1 in the front = +3 in the rear. so changing the front helps keep the stock look vs a huge rear sprocket. Unless you want a rear pizza size sprocket.... so -1/+2 = +5 in the rear and keeping a pretty stock look.

 

there is no such store .

 

yes there is

http://www.sumofallparts.net/ the website direct link.

http://motors.shop.ebay.com/merchant...ts_W0QQ_ipgZ50 the ebay store, however, not selling nothing right now on ebay. the webside, however, is really helpful.

 

I've done several conversions now, and I prefer not to go down on the front. It seems like more vibration when I do. IF you goto a 50 tooth on the rear you will have plenty of torque, and top speed will be at least 130 as I had mine to 128(GPS'd) the other day and it was still climbing. There is a sprocket conversion calculator if you do a google search. It will explain the ratios better. Also I like to stick with the 525 chain on a stunt bike. I tore the hell out ofa 520 setup.