gary the cylinder specas are just there for filler i know there are several types of engines but i don't know if we'll ever have enough info for more than one article the cylinder model in the specs appears to be about the only one that had any significant prodution so we may not find specs for the others but if we do good they did all use the same cylinders as far as i can tell from what i've found there really isn't much on the series available so if we only have one decent article that is more that most sources have thansk for your help it is much appreciated i do have some info from gunston and a few other sources that describe the gearing and other features of the engines but i don't understand most of it i'll try to copy it here this week or neext adn see if your or some of the others can interpret it