The method using "exhaust just opening, then set inlet on same cylinder" and "inlet almost closed then set exhaust on same cylinder" advocated by Dylan's links works just as well as the time honoured "rule of nine" in the Haynes manual, except here is more room for error if you get it the wrong way round!
From a technical standpoint both put the cam on the base circle so the valve clearance should be at a maximum.
I use the rule of 9 method on the Amazon but some engines can't use this if the ports are not symetrical about the midpoint of the engine. I use the valve opening/closing method on my bike because it's a V-twin, so there's no way of referring to the other cylinder.
Rule of 9 (applies to B18, B20): Valve 1 rocker fully down, set valve 8,
Valve 2 rocker fully down, set valve 7, and so on.
The manual gives the order that the valves will open in. Just remember to write down the ones you have done so you don't miss any!
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