I've recently purchased a 1980 Maxi-Luxe. Before I consider any mods I would like to know what H.P. model it is. The side sticker is missing. My only clue that it may be a 2 H.P. is that it has 16/45 gearing. The wiki parts list shows that the 16 was for 2 H.P. and the lesser tooth sprockets for 1.5 and 1. Any other way to tell - hopefully externally?