Fitting Pistons
The pistons have been cast and machined to one size and weight. The piston and rod assemblies are matched to weigh the same for engine balance.
Piston and cylinder wall must be clean and dry. Piston diameter should be measured 90 degrees to piston pin at size location shown in figure. Cylinder bores should be measured halfway down the cylinder bore and transverse to the engine crankshaft center line. Pistons and cylinder bores should be measured at normal room temperature, 70°F (21°C). See SPECIFICATIONS .