Hello mate,

http://www.nsr250.net/forums/viewtopic.php?t=13735&highlight=flywheel

The PGM2 engine has a smaller flywheel so if you do a straight swap, your ignition timing will be slightly out. To do the swap properly you will need 5k pickups and a flywheel. If you know where to find any, let me know too. haha.

Andrew.