Hi Guys, My mk3 is finally complete after a complete frame-off rebuild. It looks great but, after two days of trying, I cannot get it to start. When engaging the starter, the bike fires, snorts, and backfires, occasionally through the carb. The engine is a total rebuild; new rings, valves, and guides. Cam showed no wear. The choke on the carb (single 34mm Mikuni) is always engaged when starting. Here's the state of the bike: -The Pazon SureFire is hooked up correctly (I checked the magnets and confirmed that the trigger wires are properly connected internally and to the trigger plate). The static timing is dead-nuts on. -Both plugs show a robust spark, -the battery is a new Yuasa 18 A-H showing 13.4 v at the beginning of each frustrating starting session. -The valve lash is set to spec. I've checked it twice. -The Mikuni carb has been rebuilt, all new soft parts, needle, jets, etc.; I pulled off the bowl and found it filled with gas to within 0.5 inches of the top of the bowl and both floats functioning. When I pull the plugs and turn the engine over, I can smell gas vapor being ejected from the plug holes. -The plugs show a light oil film which wipes off. There is certainly some residual oil on the cylinder walls left to protect them during the rebuild. I have not yet pulled off the timing cover, but was completely anal during assembly to allign the timing marks on the pinion and intermediate gear, and between the timing marks on the intermediate and cam sprocket, and to insure 10 rollers between the marks. With a rod in the plug hole, I checked the opening and closing of the valves vs. the piston position and found them grossly correct, although this was not an accurate test. Something is grossly wrong, likely with the timing, but I'm out of ideas and short on experience. You guys have always come through for me during this project; just one more time.