I have a 300ex with a whitebros e series slip on and a jet kit done to it.I was woundering what size sprockets i should put on the front and back.I want it to do 65-70 if it possible.Aslo what other mods should i do to it to help with the gear change.
Thanks

 

How many teeth are on it now?

 

I have no clue what ever stock is

 

Stock is 13. So go 2 in the front and maybe down 1-2 in the back.
Get a full exhaust, k&n, maybe cam and or other bolt on's, and maybe a small bore with a high comp piston, or just the high comp piston.

 

How much top end will i get out of that