MAX-TORQUE JACK SHAFT INSTALLATION INSTRUCTIONS
Jackshaft Kit Contents:

• A. Jackshaft Steel plate 4" x 8" x 1/4"
• B. 20 tooth/10 tooth double sprocket. (For # 41 Chain ONLY!)
• C. 3 Ea. 5/16" hex head bolts.
• D. 1 Ea. 5/16" counter sink Allen bolt.
• E. 1 Ea. 5/8" snap ring.
• F. 1 Ea. 5/16" special Zerk bolt and washer.
• G. 1 Ea. special sized #41 chain.
• H. 1 Ea. SS1034IKZ special Max-Lube clutch.
• I. 2 Ea. 5/8" fibre washers.
• J. 1 Ea. protective cover.
• K. 2 Ea. protective cover mounting studs.

Depending upon the engine model number, the kit might also include a special spacer washer.

Installation:

We recommend that the axle or wheel drive sprocket be a 54 tooth size. The engine must have a four bolt pattern on the crankshaft cover plate.

Step 1:If there is no hole drilled in the keyway then follow the directions on how to do this procedure found under "Lube Clutch"

Step 2: Mount the Jackshaft plate as shown above All four bolts should be tight, however be careful to avoid stripping the threads in the aluminum housing. Use lock-tite on these four screws.

Step 3: Depending upon the engine model, your kit might include a special spacer washer. If so place this washer on the Jackshaft stub axle now. The two fibre washers included are to be placed on the engine shaft before mounting the clutch. They are designed to retain the grease in the keyway.

Step 4: Loop the special sized chain around the 20 tooth sprocket and the 10 tooth clutch sprocket remembering that the clutch sprocket and the 20 tooth side of the double sprocket are closest to the Jackshaft Plate. Simultaneously slide the clutch on the engine and the double sprocket on the Jackshaft stub axle. When doing this be sure that dimple on the inside of the clutch lines up with the keyway in the engine shaft. You should not force on either of these pieces. All components have been designed to provide a snug fit when properly installed and all should slide on with no force required.

Step 5: Secure the clutch to the engine shaft with the special Zerk bolt and washer. Be careful not to over tighten the bolt to the point of breaking it. Install the snap ring on the Jackshaft stub axle in the groove closest to the double sprocket.

Step 6: Use a grease gun and give each of the two Zerk fittings a shot of grease. It is a good practice to slowly rotate the chain during this lubrication process to be certain that all bushings are completely lubricated.

Step 7: The two bolts on the engine diagram labeled "Protective Cover Mounting Studs" must be removed and replaced with the two studs provided in Kit Contents "K". These are provided to securely hold on the protective cover and the cover is secured with the two nuts. Assembly of the Jackshaft components is now complete. Pass the drive chain through the bottom of the protective cover, around the 10 tooth end of the double sprocket, and the drive sprocket. Lengthen/shorten this chain as necessary to provide a snug but not overly tight fit. When this chain has been properly sized the rear wheel should turn freely.

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