In the video, you were giving it throttle but yet one cylinder was not running. If both carbs are being operated by the throttle cable (check and make sure), then sync is not an issue in terms of both cylinder running (or one cylinder not running). Granted poor carb sync results in an un-smooth engine, and one cylinder maybe not running during idle, but it will not prevent both cylinders from at least running during above idle throttle position. You should be able to determine which cylinder is not running by header temp. Smell that exhaust pipe...do you smell any gas fumes? When running, try spraying in some starter fluid to see if that cylinder comes alive. If it does, then you have a fuel starvation issue, like a kink in the fuel line, stuck float/needle, improper float level, clogged jet, etc. Refrain from pulling in/out the plugs if you have already checked the plugs since you can strip out the threads. If the plugs are ok, then it's either lack of electrical juice to that plug, or a fuel/carb issue.Sundevil36 wrote:I suppose not well enough!
If the front cylinder is not running, I might suspect a failed fuel pump. The rear can still get gravity fed fuel, but the front will be starved.
Keep the battery charged by using a smart charger.