I started to reassemble the lower engine which is in good condition, the piston pins were difficult to disassemble so I went back through the reamer in the pistons to put clearances 0.015 mm to be able to push the pin with the finger, I made a template of the bottom cylinder seal to replace paper with aluminum seal series 1060 which does not pack and which can be reused to have a value on the protrusion of the pistons in relation to the cylinder, more than a year ago I put a complete crankshaft with new connecting rod in an engine whose connecting rod foot did not allow the entry of the piston pin I had to pass the reamer.
I regret not having taken the training course at S&S to learn everything that's wrong with the 132 cub, an engine that makes about 70 hp per liter.
Correct: The 121 cub was completely rebuilt after 120,000 km; it previously used a set of camshafts, head gaskets, base gasket, cylinder, oil pump, and piston on the last complete overhaul.
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