you have a separate problem about bike wont rev up above 8k, cud be carburettion settings or ex up valve not opening (just a thought cud be completely wrong). If u have firing order wrong engine either wont start or run a like a bag of nails like backfiring tru exhaaust and just dies.

Ah - well seee....

What you asked was the "firing order" when you really wanted to know the order of the HT leads to the relative cylinders