I just bought this bike a couple weeks ago. I rode it the night I got it and started it again the next afternoon. Later that night I tried to start it again and it wouldn't start. It sounds like it is going to but just won't start. This bike just had a tune up in Dec. and the plugs, filters were changed and carbs cleaned. I pulled the plugs, dried them, checked the gap and put them back in. The plugs looked to be brand new. Since then I have tried to start it repeatedly and even used all the recommended starting techniques outlined by the manual with no luck. Any ideas on what I could do?