Ok my cbr600 '91 won't start i had carbs apart, they're fine. Plugs bit sooty but ok new fuel in the tank and it only stood for 9 months. Anything else it could be? It turns over, wants to go but won't and other times it just backfires! Help.

 

whats the gap on plugs for my cbr, no manual! bought NGK iridium ones!

 

started and running sweat! happy days.