Snowmobile problems?

Hey i have a two stoke mxzx 440 and it accelerates fast untill about 30 then it just stops accelerating, it doesnt die it just stays there. I think it

Hey i have a two stoke mxzx 440 and it accelerates fast untill about 30 then it just stops accelerating, it doesnt die it just stays there. I think it might be the jet but idk. Has to be in the carb most likely?

or:Hey i have a two stoke mxzx 440 and it accelerates fast untill about 30 then it just stops accelerating, it doesnt die it just stays there. I think it might be the jet but idk. Has to be in the carb most likely?

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