Yz 125

i bought her they are not ecel rims they were totaly dissasembled and then painted. but she moves iv have only ridding it 3 times now and it easly will take my blaster in 3rd gear. these things seem to have like to seperate power bands like 0-half throttle they are flying but go past that and they will lift the front tires in a wheelie. i have yet to get it past 4th gear half throttle. i dont know what year it is it says 1999 but my plastics say 1996. can anybody tell me how to check the vin to see?
 
I used to have a '99 yz125. Even stock I could out run my brothers modded 250r on the highway.