Hi, I just picked up a new to me bike, it's an '88 200. The price, $75 including new tires and plastics. The bike doesn't appear to have been abused, just neglected, but it's missing a few things to make it trail worthy. Mainly a silencer and ignition rotor. After sticker shock on the cost of a new one, I'm looking for a used one. So, my question is...What other bikes (and years) interchange with that rotor? thanks.