hi i just bought a 2000 honda 400 ex,i bought it off a guy in my area and when i test drove it it ran good.well after i bought it i brought it home and it only sat for 5 days and today i went to start it wouldnt start but the temp is like 9 f outside. and anyway i kept tryin for bout 20 mins and i looked down and seen the exhaust is pissin out oil at the motor and exhaust connect,and by the end of exhaust....what is going on what could this be???please help me i never owned a quad before and just paid 2000 for this thing someone help me out thanks keith