KZ 900 - 50 years later !

I think that the bacfires (pop) issue has been solved ! The timing was off a bit. I just made a small ride and no pop at start up nor while running.This made a big difference in low-end acceleration.

But....there is alway something ! After completing the timing ajustement, I shut down the engine and left the petcock at on. Five min. later, there was a gas spill under the bike....RRRrrrrr ! 

I usaly close the petcock but this is not suppose to hapen. The carbs were cleaned and I smouth out the floats tang to insure that it can travel freely.

Good to hear that you solved the popper !   about the leak ... one thing it can be is that the float rubs on the bowlgasket . I have some times had a leak after a 
carb rebuild then first thing to try is to give the carbs a wack with a plastic hammer that can solve it.