use a gunson colortune
or
turn each pilot screw fully in (not overtighten) then two turns out. starting with cylinder 1 turn out until the sound of the engine changes and starts to hunt/miss. should only be maybe 1,2 at most. from this position turn the screw in - the engine will recover - keep going until the engine hunts/misses again - count the turns whilst doing this. Turn the screw back out again HALF the number of turns you just counted.
Do the same for cylinder 2,3 and 4.
The colourtune is better though , but the above will do
