2005 TC250, electric start. Ran fine before I put it away for the winter with good gas and Sta Bil. Now it won't start. I've got great spark and there is gas getting to the cylinder as evidenced by the darn thing fouling the cylinder with so much gas I have to take the plug out to let the piston spit the gas out!! So what's the deal here? Do I need to drain the gas and try good, fresh stuff or what? Should I find a big long hill and try to jump start it down it ?