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you should get big bore kit, after market carb a couple sizes bigger than stock, an after maket exhaust, and make a couple holes in the airbox. if you want to gear it lower to get more low end power get a 52 tooth sprocket or if you want more top end you can get a50 tooth sprocket.( 51 tooth is stock).For the 140l you can also get kx 100 forks to make a better suspension and maybe even kx 100 back shock. you can also get a lighter battery and tune the carb right. tuning the carb right is everything. new bars will also increase handeling.

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13y ago
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Q: What should you do if your klx 140 is to slow?
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