Yes, 3 round dots from the casting mold on the front of the front cylinder and rear of the rear cylinder is the newest cylinder design. A rear crankshaft bearing housing (where the serial number is engraved) of about 1-1/2" is the latest crankcase and crankshaft design and has only been out for a few months, the older version bottom end had a rear bearing housing of only 1-1/4", this is measuring the the outside of the casting where the rear crankshaft bearing is located. There are several other changes that have been made over the years but these are the major ones. Bottom line, if you want to guaranty you get the latest version you have to buy it from a distributor that buys directly from the faactory, not a local hobby shop or online swapshop.
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