Hey, I have an '81 Derbi Variant that has sat for a few years and just recently came across it. I can not seem to get it to start at all. It sounds like im getting compression when i try to pedal it up but i cannot get a spark from the plug. I believe the plug cap comes from a coil that is a minimax, but when i removed the panel on the left side crank it looks like there are some blue battery packs in there. Any help would be greatly appreciated!