Production lines have all necessary controls and inspections engineered into them, but an individual building an engine must take responsibility for fits and tolerances. This is the case in a race shop or for a home builder. The basics are in the available manuals for all to see, and you begin, as one man put it, ‘By just getting into it.’ We all begin with just the desire to do it and w willingness to learn from mistakes. Experience causes the unfamiliar to become familiar.
I got a call from two club racers who’d decided to change the crank in their Yamaha, Honda or a Kawasaki. They basically wanted someone to tell them they could do it. They had the manual, some tools, a new crank, and desire. It took them weeks of evenings, and we spoke on the phone often. They found and removed fasteners, pulled the heads and cylinders, and then the pistons.
The parts began to look less scary and more familiar to them. Engine features began to make sense. Each step was in the manual – pulling the ignition rotor and crank primary primary gear. Storing, even labeling, the parts as they came off. They gradually became their own experts.