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I have a stock Raptor 125 for my son to do cross country races on. I put new tires, bumper, and nerf bars on it. I changed the drive sprocket to a 13 tooth. Besides that everything else is stock. What is everyones opinion as far as beginning to make his bike faster? What would you do first?
 

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Welcome to the forum,

I would look into whatever aftermarket exhaust is out there for that then jet accordingly. I don't know anything about those size of the Raptor family but freeing up the exhaust always helps anything.
 

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Getting the spent combustion out faster as that geezer suggested is always good. That will allow you to get more in as well so I would look into an aftermarket air filter/intake. More going in will help you make more power. I suggest those two things first, then have the jetting adjusted for the increased flow.:thumbsup:

Keep us posted on what you do and your sons progress, this sounds cool!
 
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