This is the first time I have done this with the head off a Bullet engine. Hopefully this will demonstrate the relationship between piston travel versus crankshaft rotation in degrees, when checking and / or setting the ignition timing on these engines. The three sets of figures shown are straight from the Royal Enfield Redditch manual, so are as reliable as they can be.
People are sometimes concerned that using a TDC tool through the plug hole puts it at an angle and as a result, the recorded linear movement of the piston may not be accurate, so this was done with the dial gauge pointing straight down at the centre of the piston crown for greater accuracy.
7 сен 2024