Have noticed that sometimes when I'm at a light and am in neutral and try shifting into 1st it's like the gear doesn't catch and as I take my foot off the shifter it goes back into neutral. Sometimes if this happens I have to roll forward a little and then it will click and then it shifts into 1st like usual. Is this normal? Is something lose? I have yet to learn the ins and outs if my bike and really need to. Thanks guys.