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What size main jet should i run for my ttr125?

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I have a TTR125 that has the BBR 150 big bore kit and cam, and also a k&N filter. And I have the 26mm carb on it. I am also running the Yoshimura exhaust. What size main jet do you run for it? I have a 120 main in it right now, but it is missing at top end speed. Any help would be appreciated.

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I'm having the some problem with my TTR125. The mods Ive done are BBR Pipe, Air Box Mod with UNI air filter and 26mm BBR carb. I playing around with the jetting today Ive tried every thing from 100-120 the best jet so far have been a 110 but still not quite right. I put a (disc thing) bbr call it a silencer in in between the end cap and the baffle which has made it better. I'll spend a couple more hours on it and let you know how I go.

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I didn't has any luck with the jetting. even tried tapping up half of the air box. Maybe it's the needle Ive tried different positions next will try different needle. In Australia we only have 98 octane fuel (bummer).

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