hey guys , i have roughly 600km on my bike and i noticed recently that when pulling away or when the bike is under load the bike will make a sort of hissing noise and the engine vibrates .. it only does this in high gear low gear and reverse it is fine , i had the bike stuck once and had a bit of belt smoke and the bike went into limp mode… could it just be a flat spot of the belt or something in the clutching.. any ideas, info appreciated