We've missed you. ;O)
This is the second one of these, great fun.
You would be right if all 4 are firing properly, where you going with this ?
How clean are your pilot jets ?
Blocked vent to the gas cap will do that.
Let the person who is awarding the prize make the rules. ;)
Competition closes 28th July 2016.
I'll start it off with my 'junkyard dog' scale 1-15
Sounds like one or more of the butterflys is catching, loosen the 2 screws & force the butterfy in with your thumb & re-tighten the screws.
Make sure the battery has at least 12.6 v, then cross the starter relay with a screwdriver.
Clean up and tighten the ground wires.