i have a dealim scoter s five fifty cc 2 stroke that i just purchased ive been riding it for a month and i noticed that ive got a whining noice comeing from where i beleive is just behind the kickstart behind the casing,and also it seems that when i get up to speed say 60kph that i get a slight vibration from that same area can anyone shed some light on what my problem might be thankyou