MK-Morzon Engine Crankshaft Sleeve Adapter — Fits Small Gas Engines, Includes Keys & Screws, Corrosion-Resistant

MK-Morzon engine pulley crank shaft sleeve adapter enlarges gas engine crankshaft diameter so you can mount larger pulleys or gearboxes without replacing the motor.

This machined shaft sleeve provides a secure, reversible way to adapt smaller crankshafts to larger drive components. It’s built from corrosion-resistant material, supplied with keys and mounting screws, and factory-tested to match or exceed OEM fit and finish. Ideal for small engine repairs and upgrades, the sleeve saves time and cost by avoiding new motors or custom pulleys.

How does this sleeve let me fit larger pulleys and gearboxes?

The sleeve slips over the engine crankshaft and increases its effective diameter, creating a precise mating surface for larger bore pulleys or gearbox inputs. It locks in place with the included keys and screws so torque transfers safely without slip.

• Expands crankshaft diameter to accept larger bores
• Secures with two keys plus 3/8-24 and 7/16-20 screws
• Mated surface resists wear and reduces shaft stress

Which engines and models will this adapter work with?

The adapter is designed to fit a range of small gas engines used on lawn and garden equipment. It directly lists common compatible models and will fit engines with matching nominal shaft dimensions; check shaft diameter and keyway before ordering.

• Compatible models: Pulsar Lawn PTG1220D5, Realm RM-LM01-B2Z-340
• Also fits: Sun Joe MJ404E-360-RED and Sun Joe MJ408E
• Best for crankshafts with matching keyway and nominal diameter range

What comes in the package and how simple is installation?

MK-Morzon ships everything required to install the sleeve so you can complete the swap with basic hand tools. The kit is compact and includes both common screw sizes so you won’t need to hunt for additional fasteners.

• 1 x shaft sleeve adapter (precision machined)
• 2 x keys, 1 x 3/8-24 screw, 1 x 7/16-20 screw, 1 x washer
• Installation: slide on sleeve, align keyway, insert keys and torque screws

How durable and reliable is the adapter for repeated use?

This sleeve is made from high-quality materials chosen for strength and corrosion resistance, then tested before shipping to ensure dimensional accuracy. It’s engineered to withstand typical loads on lawn-and-garden engines and to avoid cracking or deformation under normal use.

• Corrosion-resistant construction for outdoor equipment
• Wear-resistant finish reduces maintenance frequency
• Factory-tested to meet or exceed OEM standards

Who is this for: The MK-Morzon shaft sleeve adapter is for DIY mechanics, small engine repair shops, and equipment owners upgrading or restoring lawn and garden machines. Choose this kit if you need a cost-effective, reversible way to adapt your engine to larger pulleys or gearboxes, want a complete hardware set for immediate installation, and prefer a product tested to OEM-level fit and durability.