Crash:

Since the engine ran fine until you did the blender I'd be far more inclined to blame the clunk shifting than blame the engine.

The problem, however, could be a cumulative thing.

In my opinion, the Byron fuel in a Moki is maltreatment. The Moki wants more oil, and it prefers castor.

Go to your grocery store, get Baker's AA castor oil, or to your local drug store and buy USP castor oil. Or, as stated earlier, Sig castor from your LHS. The LHS with the Sig label is also the most expensive way to buy it.

Then add at least 2 ounces per gallon of Byron fuel and you should be OK. Might even like it better at 3 ounces per gallon. In either case it wont change the percentage much, 3 ounces per gallon is just barely over 2%, 2 ounces per gallon is right at 1.5% added.

Bill.