Abstract: An apparatus and methods are provided for a CVT primary clutch that provides enhanced adjustability and performance to off-road vehicle drivetrains. The clutch comprises a stationary sheave attached to a center post coupled to an output end of an engine crankshaft. A moveable sheave slides along the center post toward and away from the stationary sheave in response to engine RPM. A spider portion mounted onto the center post is coupled with the moveable sheave by multiple shift arms and ramps. The shift arms roll along the ramps to push the moveable sheave toward the stationary sheave in response to engine RPM. The weight of the shift arms and the angle of the ramps may be adjusted to affect the engine RPM at which the moveable sheave begins to move toward the stationary sheave. A face plate is fastened onto the moveable sheave for protecting internal components of the clutch.

Abstract: A CVT spider assembly roller system having a spider portion main body, a plurality of main body arms extending equal distance from a sidewall of the main body with the arms each having a free end, first side, a second side, and a roller supporting orifice extending from the first side to the second side of the arm, a first bolt receiving slot extending from the free end of the arms into the roller supporting orifice and a second bolt receiving slot located on the main body and aligned with the first bolt receiving slot, a spider roller supported partially within the spider roller supporting orifice and including a moveable sheave engaging exterior rotating surface extending partially outward equal distance from each of the sides of the arm, and a shift arm supporting recess located on the sidewall equal distance between each of the arms of the main body.

Abstract: An apparatus and methods are provided for a CVT primary clutch that provides enhanced adjustability and performance to off-road vehicle drivetrain. The clutch comprises a stationary sheave attached to a center post coupled to an output end of an engine crankshaft. A moveable sheave slides along the center post toward and away from the stationary sheave in response to engine RPM. A spider portion mounted onto the center post is coupled with the moveable sheave by multiple shift arms and ramps. The shift arms roll along the ramps to push the moveable sheave toward the stationary sheave in response to engine RPM. The weight of the shift arms and the angle of the ramps may be adjusted to affect the engine RPM at which the moveable sheave begins to move toward the stationary sheave. A face plate is fastened onto the moveable sheave for protecting internal components of the clutch.

Abstract: An apparatus and methods are provided for a CVT primary clutch that provides enhanced adjustability and performance to off-road vehicle drivetrain. The clutch comprises a stationary sheave attached to a center post coupled to an output end of an engine crankshaft. A moveable sheave slides along the center post toward and away from the stationary sheave in response to engine RPM. A spider portion mounted onto the center post is coupled with the moveable sheave by multiple shift arms and ramps. The shift arms roll along the ramps to push the moveable sheave toward the stationary sheave in response to engine RPM. The weight of the shift arms and the angle of the ramps may be adjusted to affect the engine RPM at which the moveable sheave begins to move toward the stationary sheave. A face plate is fastened onto the moveable sheave for protecting internal components of the clutch.