its a piece of cake. Go take a look at your carb, you have to unscrew the 4 screws on top to replace the needle, thats simple. then flip the carb over and change out the main jet, the only tricky part to this is, disconnecting enough of the stuff to get some room to flip it over to get to the bottom. 4 more screws here. Save your 30 bucks and take a shot at it. Its really quite simple to do.