[WoodyBraap13]

I have a 2018 thumpstar TSX-C 125 (did a motor swap to a pitster pro 155z HO) I want to get more power without shortening the gears. I'm currently running 15/43 on my sprockets. Looking for a solution. I dont even know what aftermarket sprockets will fit this thing. T bolt only shows my current sprocket as options. Any suggestions?? How can I get more bottom end power without playing with the gearing (as I may not be able to)

 

[JAZ-SFT]

Going a smaller carb would give you a lot more punch down low but would limit your top end if you don’t want to change sprockets
What carb do you have on it now?

 

[WoodyBraap13]

Going a smaller carb would give you a lot more punch down low but would limit your top end if you don’t want to change sprockets
What carb do you have on it now?

26mm keihin

 

[JAZ-SFT]

You could try a 22 or even as small as a 19 deffs run out in the higher rpm but give you a lot of punch down low

 

[dirtbkr188]

FWIW, a $20 14T front sprocket is the same as going up 2+ teeth on the rear and is a whole lot easier to change