I just got a 2006 Kaw 900 Classic FI with a bit over 5,000 miles on it from my son. The last time that it was cranked up was 6 months ago. He did not winterize, or shelter, but left it outside with a non-waterproof nylon cover. It will not run (shocker). I put a new battery in it, added Seafoam, inj. cleaner, and approx. 4 gallons of fresh gas in the tank. I pulled the plugs, checked fine for fire, checked the synth oil and is also fine. Still turns over but won't start, what next?