Re: Help this bike is irritating!
Hard starting and popping can also be a compression leak at the head. Pull your head and with some 600 grit paper on a flat surface like a piece of polished marble (some people recommend glass I don't because it can shatter) and slide the head back and forth and inspect to see that the mating surface is true, then replace the head gasket and retorque the nuts. If you have acorn nuts on the head studs consider replacing them with standard m6x1 locking nuts because the acorn nuts tend to bottom out on the stud and not hold the head down properly.
Also check you plug to see if it is dark black that would indicate a rich condition and you might have to adjust the needle clip on the slide or rejet it to your altitude accordingly If it is white ashy looking you are running lean and may have an air leak.