Max-Lube System (Patented)
Developed in conjunction with Chuck Brister, a major kart manufacturer in Louisana, to address one of the most frequent problems with fun karts - lubrication of the clutch bushing. This lube system supplies lubrication directly to the clutch bushing through the keyway of the engine crankshaft utilizing a special zerkbolt fitting which is available only from Max-Torque. Since its introduction in 1992, lubrication problems have been dramatically reduced.
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MAX-LUBE Clutch Information and Installation Instructions

Check to be sure that your 5 hp Briggs & Stratton or Tecumseh engine has a drilled and tapped hole in the end of the crankshaft. The size of the hole should be 5/16" x 24 threads per inch. If your engine does not have this hole, the MAX-LUBE clutch cannot be used.

Installation is simple and quick and requires the following:

Tools Required

• electric drill
• 1/8"drill bit
• ruler
• hammer
• center punch
• 1/2"open end wrench

Max-Torque Supplied Parts:

• Clutch with built-in key
• 5/16" x 24 TPI Zerkbolt and washer
• Two 3/4" diameter fibre washers

Installation Instructions:

Examine the SIDE VIEW and TOP VIEW diagrams above.
Remove the old clutch from the crankshaft.
Disconnect the spark plug lead and slowly pull the starter handle until the crankshaft keyway is facing upward.
Use a ruler to measure a point approximately 7/8" from the outboard end of the crankshaft to the center of the keyway. As shown in the diagram, the width of a nickel will also provide this dimension. Once this point is located use the center punch with a firm hit to make an indentation in the center of the crankshaft keyway.

Drill a 1/8" hole at this indentation until the drill bit breaks through the crankshaft bolt hole cavity. Stop drilling. Blow out this 1/8" hole to remove any chips that might remain from the drilling operation.

Place the two fibre washers onto the crankshaft, slide the clutch on the crankshaft and secure the clutch with the Zerkbolt and washer. CAUTION: Do not over-tighten the Zerkbolt as the hex head will snap off. No more than 15 ft*lbs of torque should be used in tightening the bolt!

Using a grease gun give the Zerkbolt on full pump of grease.
Replace the chain on the clutch sprocket and replace the chain guard.

Other Operating and Use Instructions

Grease the Zerkbolt, with one squirt, after each week of operation.
Avoid or eliminate incorrect gearing. The gear ratio between the clutch sprocket and the drive sprocket should be 1 to 6. For example, if your kart has a 12 tooth clutch sprocket the drive sprocket should have 72 teeth. A 10 tooth clutch sprocket would require a 60 tooth drive sprocket. Tires with a diameter exceeding 15 inches should not be used. If any of these suggestions are not followed, the clutch will not operate properly and clutch life will be significantly reduced.

With proper gearing, installation and care, your MAX-LUBE CLUTCH will provide you with many hours of trouble free performance.