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The "Yellow Tankers", 1971-1972, same frame as Sidepiper, straight finned head but radial finned head started to appear on the works bikes. The following images stolen from http://www.czmadness.net/Actually, the frames are different. Sidepipers had the single/narrow downtube that runs under the motor where as the YTer is the same as the '73 Blackframe machines. The only yellow bikes that had the sidepiper frames were a few of the 1970 bikes built over in the US by American Jawa to move inventory overstock. These bikes were piece milled together out of loose parts on the shelf. Some were also a few factory rider bikes in the Inter-Am such as Halm, Tomar, Bickers and DeCoster. Check out http://www.geocities.com/wheelsofdirt/cz360.html for one of these super rare CZ's.Eric Johnson