Please forgive what may be a stupid question about jackshafts, I've been searching and not finding what I'm looking for... The bike I'm looking to set up with the kit I'm tinkering on is a rear-deraileur geared bike with disc brake and a single front chainring. I'd like to get a jackshaft set up going to take advantage of the gears and lose the scary stock tensioner and ragjoint to allow the disc brake. Here's the question: Is it possible to set up a jackshaft such that when you are actively pedaling without the motor running, you are not turning the engine's drive chain? From what I've been reading, the answer seems like a "no", is that right? You need to be turning the drive chain (via pedaling) to start the engine? If so, is there an alternate way to do what I'm looking for? I'd like the ability to pedal without any added friction in the drivetrain, but then when I want to motor, to engage the engine and let 'er rip. Motor is a 2-stroke of unknown (49-66?) cc's. Also, perhaps I've got something out of whack with my set up, cause I am new to this, but I can definitely feel the added drag when I am pedaling with the clutch disengaged, it's not a ton, but its there. I'm looking to be able to completely ride the bike like normal, but then crank up the engine for quickly covering ground. Am I making any sense?