2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 197Get this manual
TRANSMISSION
4Check: Transmission gear engagement (each pinion gear to its respective wheel gear) IncorrectReassemble the transmission axle assembliesNOTE: When reassembling the main axle, press the 2nd pinion gear onto it as shown102.2102.4 mm (4.024.03 in)