Went home from college this past weekend and scored a 2002 Cr125 for $300. The previous owner didn't mix the gas right so It has a seized crank. I noticed upon bringing it home that i cant switch gears. my question is what could be causing the bike to not be able to shift? i am assuming what is causing this happened when the crank seized. any information is greatly appreciated. on a side note what would the best option for a new crank be. i know to stay away from wiseco. i have also heard that an 05-07 crank is much more reliable. will that crank fit into my bike? and where is the cheapest place to buy OEM parts?