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Popping noise from exhaust when revving TTR 125


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I haven't had a dirt bike for long but am wanting to learn a lot more about them. My bike makes a popping noise when revved and I have read that the jets need to be adjusted or I need new ones. Can anyone tell me how to adjust them or how to know if I need new ones? I am almost positive the air box has been modified. I appreciate the help and like I said before, I'm new to all of this so easy to understand instructions would be VERY helpful. Maybe a video showing me how to do it?

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  • 2 weeks later...

Specifying which model, year, modifications, will help a lot. you've answered your own question. Yes the popping is from running lean do to the air-box being modified.

You will need to rejet. There are an abuntant amount of threads on this topic and I guarantee you can find what you are looking for if you look hard enough.  

 

That being said, here's a youtube video. Two seconds on google. you get the idea.

https://www.youtube.com/watch?v=ZnC9nXF0CWU

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