Thanks azman, any idea why I would need it on the bike as I was told it's a 1970 kickstart only motor?
It's probably your ignition. If you don't have another ignition anywhere, it's your ignition. If you do have another ignition then that box and the part leo pictured are just left over and are valuable on ebay. The two round silver covers at the upper part of the engine, if there's no mechanism under either it's probably your ignition. Or disconnect it and if your bike won't run, it's your ignition...