resistance

Greetings lads, How "fat" would you guys says a spark should be to be up to spec? It's a bit hard to put a size on a spark, I suppose, but please try! My spark is bright blue / white in colour, so that looks fine, but it's awfully thin. Another guy that looked at it also thinks it doesn't look...

Anyone got the resistance values for my coil,I've got a new stator and a spark but not sure if this is breaking down under load ie won't start.....

Having got sick of the starting problems we are having, I ordered a new SEM as the static readings from the old one were 162 on the green/black and zero on the red/black. The new one however is not much different in that green/black is 165 and still ZERO on the red/black measured just after...