If the bike has no torque converter,I would be pretty much direct drive.You would have to compress the fluid in order to lose power,that isn't going to happen.
Looks like there could be vanes in the system though,meaning torque lose or gain,depending.
Efficiency of fluid drive is real close to chain drive.About 95% for fluid/98% for chain.
Last edited by Booger1; 10-28-10 at 12:54 PM.