I'm trading a guy my 2004 Predator 500 for his Outlaw 525 IRS. The problem with his quad is that it will not start through the electric start/starter, but will bump start. Here's the kicker, the starter will turn the engine over but cannot start the engine. Bump starting will. What could be the issue here? Carb problem? Not very familiar with these Outlaws, so any help is appreciated, thanks!