Crankshaft services for 2 & 4-stroke engines include cleaning and inspections of the crank, press it apart, polish the pin bores, press a new rod kit and then true the crank to factory recommended specs. Special consideration is given to 4-stroke cranks, like checking the journal surfaces and polishing, deburring cam gears, flushing oil passages, pressing and truing with new parts, and pin welding for safety.