Here is a coupon for this weekend at harbor freight tools. This will help check power from your cdi! I've seen this meter in many posy an want to share it for everyone like me who is new to the exciting world of motorized bicycling. This is a must have for your tool box. And its free with purchase so go in, buy a $1 water or anything at the register for a doller or less an add this awesome tool to your tool box!! Hope this is helpful for you and happy riding!!