Hi fellow motorbikers,
Just a few quick comments about the latest drive system for the HF 79 and 99 CC motors.
We currently offer the Q-Matic drive as a bolt on option for the smaller HF 4-stroke motors. The drive has different primary ratios to work with the low RPM, high torque motors, and places the cruising speed near the motor's peak torque curve.
The drive simply "bolts on" and has a primary ratio of 2.06 X 1 and when used with a 56 tooth rear sprocket produces a final ratio of 11.55 X 1. The 11.55 X 1 ratio allows great take-off speeds, good hill climbing, and execelent crusing speeds. In fact at 3600 RPMs [rated maximum RPM level] a 26" bike will cruise at 24 MPH with the stock ratios.
Like all of our production drives the custom 4" Max Torque clutch is located in the rear, and suspended between two large bearings. This design has many advantages, including a slim profile, slower clutch rotation speed, and maximum power transfer. We found during initial design, spinning the clutch at 1/2 speed or under uses a lot less of the motor's power in the process. When working with small HP motors, we need every bit of power we can salvage.
Of course we try to use American labor and parts in the drive whenever possible. We also do our best to use as many "off the shelf" parts as possible to both keep cost down and make it much easier to obtain replacement parts [if ever needed] in everyone's local area.
Have fun,
Just a few quick comments about the latest drive system for the HF 79 and 99 CC motors.
We currently offer the Q-Matic drive as a bolt on option for the smaller HF 4-stroke motors. The drive has different primary ratios to work with the low RPM, high torque motors, and places the cruising speed near the motor's peak torque curve.
The drive simply "bolts on" and has a primary ratio of 2.06 X 1 and when used with a 56 tooth rear sprocket produces a final ratio of 11.55 X 1. The 11.55 X 1 ratio allows great take-off speeds, good hill climbing, and execelent crusing speeds. In fact at 3600 RPMs [rated maximum RPM level] a 26" bike will cruise at 24 MPH with the stock ratios.
Like all of our production drives the custom 4" Max Torque clutch is located in the rear, and suspended between two large bearings. This design has many advantages, including a slim profile, slower clutch rotation speed, and maximum power transfer. We found during initial design, spinning the clutch at 1/2 speed or under uses a lot less of the motor's power in the process. When working with small HP motors, we need every bit of power we can salvage.
Of course we try to use American labor and parts in the drive whenever possible. We also do our best to use as many "off the shelf" parts as possible to both keep cost down and make it much easier to obtain replacement parts [if ever needed] in everyone's local area.
Have fun,
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