Hey guys, I have an 81 SH that I put together about 3 years ago. It was running very well until late last season when it developed a misfire. It starts easily and idles fine, but when I add some throttle to take off in gear it stutters and misfires until it gets moving. Once it is up to speed, smooth running again. It has the original TCI ignition, battery voltage is 13V with the engine off and 14.5 when it is running. With the bike in neutral I can give it throttle and it revs fine, it is only under load that it stutters. I have had the carburetors off twice this spring for cleaning and I never find any trash in the carb or any blocked ports. I have changed the coil and replaced diodes in the TCI. The timing chain is adjusted and the valves are spot on. It was running fine and all of a sudden this missing. Any help would be appreciated. 71 XS1B, 77 650D in progress and the 81 special.