A friend of mine gave me a b-2 that he trashed and broke almost everything on it. Then i fixed the things it need like wheels,tires,and other miscellaneous things. I even need to JB weld the magneto thing on the rotor it broke from the chain falling off. Anyway i got it running fine (in a ghetto way) then one day i start it to ride it bogs down completely when i try to hit higher rpms it runs fine in the lower range. Is this a carburetor problem?