atleast ge t t he airbox lid off the she and rejet. if hes got some mods on the450 trx be careful 450's can be quick especially in shitty traction conditions like coarse gravel ,loose dirt roads, wet grass etc.this is a race were terrain and rider ability will greatly influence the outcome,also race him on pavement wit h a very low tire pressure in the rears to shift the advantage toward a better win IMO |