Having problems selecting second gear from neutral on my 2009 300 Pro sometimes it selects fine other time it will not engage the gear seems fine through all the other gears just neutral into second. Any ideas to what it may be?

1 st thing to check would be the top hat under the clutch. It sits at the end of the shift shaft. You may get lucky adjusting the eccentric which is located at the same spot. Do a search for Jim Snells videos which he shows how to do it. Trials parts usa also has the videos somewhere in his site.