Nah it deffo had the other gasket in it. FFS unless some other "clown" like me has changed it at some stage.... Is that one pictured not bigger in diameter than the ones I have in it now? Would that physically fit in mine? Its got brand new jets throughout it. I shined light through most of the holes to check the carb body was as clear as I could get it I thought it was pretty good. New boots between carb and engine. The only difference is the stainless collars I put in the airbox which could remove tomorrow just to see if it helps as the boots have likely stretched back out by now anyway. The only other thing I can think of is how picky is the airbox to holes or leaks around the seal of the airfilter? The strip that goes around the airfilter has shrunk and will be letting air in ther and the airbox lid has a gap in it where the two U hoses attach to the back of it. The airfilter is old to.