Mbdutch, I use a clutch, a TAV and a PMR jackshaft on my minibikes. I installed the jackshaft essentially to approximate the effect of a TAV while still using a clutch, distributing the power across four gears instead of just two. The difference being the clutch "slips" while the TAV expands so it would matter how you have your clutch setup, gearing, etc. (I have 12t clutch to 13/15t to 72 rear sprocket) you know the drill. You've seen my GPS so I think I'm where I need to be with my current setup.
The "feel" of a jackshaft to me is different than a straight clutch, I don't have to rev as high to engage. I ride in the hills and both the straight clutch minibike and the jackshaft minibike function bulletproof on them. The TAV is more "direct" feeling throughout the range of power, provides engine torque-back when slowing down (don't have to use brakes so much) and will wheelie the bike if you give too much throttle, and even though it's more direct, this is not my preferred drive. I actually like clutches better - with and without the jackshaft. It's looser, feels more "minibike" to me. I like the sound of the clutch engaging. And I like hot clutch smell after a good ride, fills my garage with it (is that too much information....?):doah:
I know now this is not a technical description, but very subjective. I thinks it's all what you like. And I know you like to go fast..........:thumbsup:
