I have a stock 93 300ex. Every time I get the bike on a 45 degree angle the bike sputters and wants to die. A couple of times it has died on me. I'm able to put it on flat ground and it runs fine but if I do a wheelie or ride up a hill it will sputter. It does this if I've been riding for 2min or 2 hours? Anyone have an idea what is wrong?

 

Check to make sure your carb is clean. I know if it is clogged a little, it will run fine on flat ground, but then it is on an angle, it is starving for fuel because the carb has to work harder (if this makes any sense). Regardless, check the carb. Also, if you ride that angle with low gas and gas can't get to the opening for the carb, this will happen.