• SMC Rocket Rim Clutch

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Other products by SMC
Item #: SM 4404
Our Price: $179.00
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Description  more details

Sprocket not included.
Select sprocket and chain size after adding clutch to shopping cart.

See "More Details" for setup information.

1. Shoe & Spring Assembly
• The shoes are designed to rotate in only one direction. The commonly used four-stroke engines rotate counter clockwise (CCW) when viewed from the end of the crankshaft.
• Each shoe is maked on one side with an arrow to help identify its proper rotational direction.
• Inboard sprockets (sprocket next to the engine crankcase) The shoes and springs should be oriented as in Figure 1. Arrows are visible.
• Outboard sprockets (sprockets near the end of the crankshaft) The shoes and springs should be oriented as in Figure 2. Arrows are hidden.
• If it is necessary to change the orientation of the shoes, remove the machine screws, star washers and flat washers. Throw away the star washers. Pry the weights away from the hub. Reverse the springs and shoes. Replace the hardware including three new star washers. Torque the machine screws until the star washers are crushed.

2. Sprocket & Rim Assembly, Flat Sprockets
• Flat sprockets aka "roller bearing", "black" or "SMC" sprockets can rotate in either direction.
• These sprockets were originally designed by SMC in 1995. Other manufacturers have copied the SMC sprockets without license. If a racer chooses to use a clone sprocket, SMC assumes no responsibility for any problems associated with that sprocket.
• Insert a sprocket in the drum. A tight fit is highly recommended, therefore a small amount of force might be required. Secure the sprocket with the high speed retaining ring.
• Place one .080 thick washer on the inner race. • Apply a very small amount of wheel bearing grease to the inner race and insert it into the sprocket from the inside of the rim.
• Place another .080 thick washer on the inner race from the outside of the rim. (#35 pitch 12 and 13 tooth sprockets and #219 pitch 13, 14 and 15 tooth sprockets require washers with a smaller outer diameter to accommodate chain clearance.)
• Gently stretch the retaining ring over the end of the inner race and place it in the groove.

3. Clutch Assembly
• Shoes are usually skewed by the springs and must be slightly rotated and/or compressed to fit inside the drum.
• It is normal for the shoes to drag lightly on the rim when the engine is not running. The shoes will instantly disengage when the engine is started.
• The shoes will re-engage between 2500 and 4500 rpm depending upon the engine's torque output and the racer's choice of springs.

4A. Crankshaft Attachment Sequence, Flat Sprocket, Inboard
• Sprocket & Rim assembly with sprocket toward the engine
• Shoe & Spring assembly, springs side facing the engine*
• Check that the crankshaft is shorter than the above collection of clutch parts**
• Key, flat washer, split washer and 3/4 inch long machine screw
• Torque to 25 foot-pounds (300 inch-pounds)

4B. Crankshaft Attachment Sequence, Flat Sprocket, Outboard
• Narrow (.300 wide) spacer with the beveled edge toward the engine
• Shoe & Spring assembly, springs side facing the mechanic
• Sprocket & Rim assembly*
• Check that the crankshaft is shorter than the above collection of clutch parts**
• Key, step washer, split washer and one inch long machine screw
• Torque to 25 foot-pounds (300 inch-pounds)

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