Tips and tricks through the ages

Decarbonize you engine with water

The thickness of a paper match book
As a starting point for points adjustment

Put moth balls in your gas tank

Get a 3/4 cam

Desperate to light a cigarette, use accelerator pump to squirt a little gas on the tip, coil wire arc to light it ( I actually did that once)

Bleach for burnouts

Spark plugs , fuel, injected in pipes for flame thrower

Others ??