Earl the 11 or 12 depending on the conversion from metric I have seen both numbers( it is the same engine) is one one piece smaller case it can not be rotated as the 15s and up and it looks like the 09 except for the exhaust outlet which is conventional with a bolt on muffler rather than just the slot in the cylinder and buller held with a U clamp around the cylinder martin

just tried to upload the pix of the 09 MVS the infamous 500 error came up

yes it is smaller than the 15 will take a new pix since one out of file does not work and use the arc soft program