Sprocket?

[drtracer27]

Can anybody tell me how many teeth are on the front and rear of a stock 90? Thanks

[musky]

I'm pretty sure 40

[mbarryracing]

2 stroke or 4 stroke?

Stock front sprocket on the 2-stroke is 19T

[weldr383]

19 frt,35 rear

[drtracer27]

Thanks for the reply's guys. Are those numbers for a 4-stroke? That is what I am looking for. I am trying to get my boys 08 DS70 a little quicker. Already did the exhaust, carb, clutch, CDI and now I want do the sprockets. I don't want to spend too much money on it since it will never run with the 2-strokes. But he does run competitively with the series he has been running in he just doesn't have enough to pass. Thanks.

[mbarryracing]

Where are you trying to pass? In the corners or in the straight-aways via a drag race? That will dictate how you tartet your gearing on that 70.

[drtracer27]

The best chance he would have is through the corners. I don't think he would have much chance on long straights against the 2 stroke's. He is pretty aggressive and runs with them and looks to pass through the corners. I am pretty sure it has a 42 on the rear of it.

[drtracer27]

I found a very good website with the info:
DS 70 15-42
DS90, DS90X 16-40

[CYCLERC]

Originally posted by drtracer27
Thanks for the reply's guys. Are those numbers for a 4-stroke? That is what I am looking for. I am trying to get my boys 08 DS70 a little quicker. Already did the exhaust, carb, clutch, CDI and now I want do the sprockets. I don't want to spend too much money on it since it will never run with the 2-strokes. But he does run competitively with the series he has been running in he just doesn't have enough to pass. Thanks.
With this mods the ds90 take live?
I own one stock its the slower atv in the market. I dont now if waste money in this engine or install other engine. With the mods its faster than stock trx 90? Any restriction in variator? Thanks