Here are 2 pics of this Honda engine to view - looks to be a 1980 or so or it was used very little?? Has a manual clutch, manual shifter - speeds N2345, 49CC on jug, some type of PTO on the top of the clutch cover, may even have some type of pump on it?? Engine serial number AC01E - 2006767. I don't know if it's an XR50, Z50, moped 50? but was there ever an ATC with a 50? I thought just the 70CC?? Has good compression, shifts through the gears and full of clean oil!! Thanks for any input.