John,
No such luck. I still have the same engine in our Heep that was in it when it was purchased. My Granddad had it for a while for use on their farm, and he went through and replaced the one piston that had a hole in it, then freshened up the bearings and rings. He didn't believe in spending more than one had to perform repairs. He passed in 2003, so it was done some time in 2001 or early 2002, but it has been smoke free ever since.