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i have a 50cc road legal thumpstar ripper.. and it doesn't run on choke, it just doesnt start and dies wen i move it onto it from off choke. so all i can do it start it off choke and warm it up for a couple of minutes, then it runs fine.. but i just wanted to make sure it doesnt damage the...

its a thumpstar road ripper 50cc i want to know how to make it faster and what sort of big bore kit would fit it cause i cant find one. what parts or modifications or tune ups can i do.. thanks! one more thing.. it boggs when i pull the throttle too fast, any ide3as on that one.. thanks alot :)

What Should I Buy, I Defo Want A 125cc And I live In Nuneaton, Warwickshire.. Where Should I Buy One, I Only Want To Spend About 200 Quid Max Thanks