Just a couple days ago I noticed that my bike wont start right away. I crank it, it turns over but doesnt start. After maybe 15 seconds of noncontinuous cranking it will start. Any suggestions, its has done it twice.

 

There are a few things that can cause starting problems, Plugs, carbie's, filters air & in line (if it's an F3) & the battery ( & in some cases it can be the reg) & valve clearances.
Not saying its all of those things, It may just be in need of a tune.

 

mine seems to be doing the same.. and this is after new plugs and filters... And carbs being cleaned... Any other ideas