When I hold the throttle at anything over 4 grand I get a miss in the engine when I crack the throttle it runs like a raped ape I have the 78 carbs on my 836 . The carbs are shimmed so I know its getting enough fuel and I checked the fuel level in the bowls, thanks Sean for the info. My last thing will be a complete tune up ,valves etc check timing the works. Could it be one of my plug wires. right now I am using 8.8 mm graphite core excel wires , and would like too change to copper core maybe a dyna 7 mm size will this work. Also any other ideas what the miss may be. thanks