Hey guys my nieghbor bought a 300ex It has a pipe on it. Dont know if it has been jetted right. The previous owner pulled the carb to mess with the needle clip. Now when he starts the bike gas flows out that overflow hose. Other than that it runs good. The pipe gets hot,not normal hot, but hot hot. The pipe is a wb w/ movable discs. I just need to know what the stock settings and jet sizes are, so I know where to start, thanks for any help  

tell him to buy a yamaha! lol Sounds like you might want to dive into the carb and take a peek to make sure everything is done right.