To the group, It starts up quickly, and the choke works fine.It does not stall-out. the fuel filter was checked and found to be acceptable. Audibly,it sounds like one cylinder is not contributing to the power.Just a little ruff sounding. Ignition is "great" on all four plug-leads (Strong and blue ,jumping 1/2 inch to ground). Pulled the front plugs (LH and RH),and they were acceptable in wear and color. The two AFT ( LH and RH)wet with fuel,Not good. I placed a vacuum gage onto a manifold access vacuum point and its swing up and down ,in a pulsating- manner,NFG. The front two carb slider piston valves are moving adequately and the two rear-sliding piston are, "still" ,no motion. I applied a small amount of metered propane to the top of each carb-inlet while running at 1200 rpm.The front two responded,with an overrich A/F mixture condition. The rear two carbs showed -no change at all. With the motorcycle warmed up I performed a compression check and all four cylinders with plugs removed,they were at 145-150 PSI,with throttle opened during cranking 7X. At this time compression and Ignition are acceptable. Air-Fuel mixture is too- rich on the rear two cylinders. This Bike sat for 2-3 years in a garage while starving for attention. I believe that,Ethanol has varnished up the air-bleeds in the atomization functions of these mikuni carbs. Moving the slider piston valves ,while idling ,on the rear two carbs had no change. My recommendation is to is to leak check this engine with propane ,to find any induction leaks. If there are no induction leaks-great. Next remove ,disassemble,clean,inspect and rebuild these(4 each) Mikuni carbs. Also replace the diaphragm/ slider piston valves. Ok Guys, who agrees with me ?? Where can I get carb kits that aren't stamped-out crap?? What else can I check or perform prior to Carb repair? It doesn't have to get up and fly!! Thanks for your opinions and advice. Mongoman in Albuquerque