RE: Engine name
Dennis and Ed:
It is Bernhardt, don't know why I wrote Borchardt.
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Jim:
In the picture you posted note the fins just behind the carb. The cylinder casting that could have the PDP porting was made that way. The "Standard" cylinder did not have them. Note in this picture - the common loop scavenged one is on the left, the PDP engine is on the right.
Bill.