Foresure – Let us know. Almost in the same boat myself. As mentioned fitted a new Mikuni to my Sup5. It does start – eventually (I was hoping for first kick) and as you say the plug never gets wet. I have even tilted the carb over to favour the level in the enrichment chamber, might have helped a bit. Now a a questo of my own, tinkering with the air/fuel screw yesterday afternoon. It was set about 1-1/2 turns out, I found that it started running smoother and happier with it screwed home, right in !!! What does that mean oh wise ones. Remember its a Mikuni.