Just finished my 3rd cup of coffee, and all is well.
Take time to research the possible options for your drive system.
A little research goes a long way, and more importantly try to avoid the many mistakes made by others when attempting to connect the motor to the rear wheel.
If you are looking for a way to transfer the most power, consider NOT affixing the clutch to the crankshaft. The HF 79 & 99 CC motors already have LARGE flywheels and I know adding more flywheel weight only slows down the rate of acceleration, and asks the motor to give up some of the power to spin the clutch at full motor speed.
Consider locating the clutch to the rear of the drive and only spin at 1/2 motor speed. Take a look at the construction of the Q-Matic drive and you will quickly see why it transfers more power to the rear wheel than most other systems. The Q-Matic also employs an automotive wedge primary belt in place of the chain [less noise, cleaner, and maintence free], and makes the drive much thinner.
If you need detailed pictures, just ask.
BTW, my 99CC test bike with the Q-Matic drive, easily exceeds 50 MPH and climbs most hills.
Have fun,