I've noticed recently that sometimes when i try to shift from first to second using the clutch the bike will go into neutral even with a good amount of force upwards. Then cruising in neutral if i try to hit it up to 2nd again it just makes a loud trying to shift sound and stays in neutral ... I have to wait a sec just cruising in neutral and then eventually it will shift into 2nd but it sounds kinda harsh when it does... It doesnt happen every time i shift and rarely happens if i shift without the clutch, my newbie riding skills or mechanical error??? ( '02 gsxr 600 ) thanks.