MK-Morzon Engine Crankshaft Sleeve Adapter Fits Pulsar PTG1220D5 & Sun Joe — Includes Keys & Screws

MK-Morzon's engine pulley crank shaft sleeve adapter increases a crankshaft's diameter so you can fit larger pulleys, gearboxes, or other drive components without replacing the motor.

This precision-machined sleeve adapter is engineered to bridge size gaps between gas engine crankshafts and oversized pulleys or gear reducers for selected mower and power-equipment models. Supplied with two retaining keys, two common screw sizes and a washer, the kit delivers the mechanical interface you need to upgrade or repair drive components while keeping existing engines intact. Every unit is tested to meet OEM-level standards and backed by a 12-month support and return policy.

How does this adapter let me use a larger pulley without changing the motor?

The sleeve slides over the engine crankshaft to enlarge its effective diameter and provides keyways to lock pulleys and gearboxes in place. This creates a secure, concentric connection that transfers torque while preserving the original engine and its mounting points.

• Expands crankshaft diameter to match larger pulleys or gearboxes.
• Includes two keys to lock components to the adapter for positive torque transfer.
• Retaining screws (3/8-24 and 7/16-20) and washer secure the assembly.

Which machines and engines is this sleeve compatible with?

The adapter is intended for specific consumer lawn and power-equipment models where the original crankshaft requires enlargement to accept alternate pulleys or gearboxes. Confirm model compatibility before installation to ensure a correct fit.

• Fits Pulsar Lawn PTG1220D5 engines.
• Compatible with Realm RM-LM01-B2Z-340 units.
• Works with Sun Joe MJ404E-360-RED and Sun Joe MJ408E models.

What materials and testing standards does the product meet?

The MK-Morzon sleeve is manufactured from durable, corrosion-resistant material chosen for wear resistance and dimensional stability under torque. Each adapter assembly is inspected and tested prior to shipping to verify fits, finishes and mechanical performance consistent with OEM expectations.

• High-strength, wear- and corrosion-resistant construction for long service life.
• 100% factory-tested to validate fit and function.
• Designed and certified to meet or exceed common OEM quality standards.

What hardware is included and how does it simplify installation?

The kit arrives with all the fasteners needed to mount the sleeve and secure a pulley or gearbox, minimizing additional parts purchases and reducing installation time. The supplied keys and two screw sizes cover common attachment methods found on compatible models.

• 1 x shaft sleeve adapter ready to mount onto the crankshaft.
• 2 x keys to lock pulleys or gearboxes to the sleeve.
• 1 x 3/8-24 screw, 1 x 7/16-20 screw and 1 x washer included.

Who is this for: This adapter is for DIY mechanics, small-engine technicians, and owners of compatible Pulsar, Realm and Sun Joe equipment who need a reliable way to fit larger pulleys or gearboxes without replacing the engine. It’s also useful for repair shops that want a tested, OEM-quality sleeve to restore proper drive alignment and torque transfer quickly. Always verify model fit and follow safe installation practices or consult a qualified technician if you’re unsure about fitment or torque specifications.