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Suggestions for new 125cc bike

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Hello, this is my first post here. I recently purchased a chinese knock-off pit bike. It has a 125 cc loncin motor.

I am interested in modding this bike if its possible.

I am interested in a bigger front sprocket. What size would be 1 step up from stock?

I have also been reading that a bigger carb, cam, and pipe will really wake this thing up. (already runs strong)

So, my question would be what size carb should i be looking for, and as far as a cam goes, I really dont know which work with this motor.

Does anyone have any input in finding a cam or what for what motor i look for the cam?

Thanks for any suggestions.

Steve L.

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I am interested in a bigger front sprocket. What size would be 1 step up from stock?

Are you serious ?? Can't you count or something ?? :banghead:

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usually a lot people who run a 124cc pitbikes go for like a 24mm sized carb, also every knock off will have a different size sprockets so just count and go 1 tooth up from whatever u have, count with ur fingers and toes if u must

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Well it was touch and go for a minute but once i got my sock off i calculated 14 teeth up front. :banghead: Im pretty sure thats stock for xr-50's right? I guess my question should be will a 15 tooth sprocket for a xr-50 work with my bike? I tried to research but didnt come up with much. Im guessing that a 15t for xr will bolt up.

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Well it was touch and go for a minute but once i got my sock off i calculated 14 teeth up front. 🤣 .

:banghead:🤣🤣:banghead:

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hmm.. so u dont think it will fit huh? Anyone else have any experience here?? I need to get a bigger sprocket on this thing because 1st and 2nd gear are about useless. If im not like getting the bike out of my garage or something i dont even use 1st gear.

The bike is topped out so fast because of thes super short gearing. I just wanna get a little more out of it.

Anyone know of a sprocket that does work?

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can't you also change your rear sprocket. you might try and go that route

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Yes you can change out the rear sprocket aswell. I'm gonna end up doing that too most likely but for now i just wanna try 1 tooth up front.

Basically a front sprocket is usually around 15 dollars and a rear is $50.

If i think it needs geared up more than that (prolly will) im just gonna put rear sprocket on when i change the chain.

matt thanks for the link i will def talk with him, I appreciate all the input!

kx250rider how did that loncin motor of yours hold up?? mine seems ok right now but who knows i guess?

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