just got a 15 and a 41 tooth sprockets for my ds, need to know if thats a good combination for drag raceing, just looking for some take off speed to keep up with raptors off the start, my topend with stock gearing and big gun cdi on gps was 81mph,what do you guys think thanks.

 

I ran a 15, 40 on 20's for a day or so, just enought to get beat by a 450r, great combo for the trails but not for a drag, my top speed with that setup was around 78mph the 15, 41 should be a good combo, my top speed with a 16,40 was 83 and that is the best combo for me right now. Not sure if you are talking 660 rap or 700, shouldnt have any problem beating a 660 anywhere.

 

What is all your mods?

 

and how much do u weigh?

 

dropping 1 tooth on the front sprocket alone is good enough to beat a raptor660, pred, 450r, and yfz off the line, least it worked for me against all those :-D

 

my brother in law just got a 700 stock, told me he was going to eat me for lunch we are both going to texas in three weeks its about 700feet of elevation,i have won against stock 700 also yzf 450,zillas but the race has to be at least 500 feet it just seems they all take of really good ,will be raceing on pavement,i am 220lb got big gun cdi, je 11.5.1 piston,all the omr mods on stock carb ,ported intake , ported and matched exhaust on head ,running 182mikuni jets,lid on,dg 12disk slip on.

 

For 300ft I like the higher gears (16/17 front) with the 20's. Lower gears over power them and make the gearing too low. On pavement you will just have to see what your bike likes in 500ft,

 

On pavement Id go for the 17 or at least the 16. Not much drag and you wont need that much low end. I used a 15 in sand and launch in second gear. Make sure on pavement you dont over rev. Get through those gears and I would like to know if you have a CDI.