502843101 Recoil Starter Assembly for Redmax & Husqvarna

Key Features

• High-Torque Recoil Spring: Features a precision-tempered steel spring designed to provide consistent tension and rapid rope retraction across thousands of start cycles in professional environments.
• Reinforced Pull Rope: Equipped with an industrial-grade, multi-strand braided nylon cord that resists fraying and snapping during high-compression cold starts.
• Impact-Resistant Polymer Housing: Manufactured from high-density, heat-stabilized polymer to withstand the extreme vibrations and high operating temperatures typical of 50cc+ backpack blowers.
• Ergonomic Starter Handle: Includes a wide, textured grip handle designed for maximum leverage and comfortable operation, even when wearing thick work gloves.
• Direct OEM-Spec Fitment: Engineered as a precision "drop-in" replacement for original Redmax and Husqvarna units, ensuring perfect alignment with the flywheel pawls and mounting points.

Replaces / Cross-Reference Part Numbers

• Husqvarna / Redmax: 502843101, 502 84 31-01
• Redmax Original: 68206-75010, 6820675010
• Echo: A051001520
• Other: 150BT-01

Compatibility & Fitment

This recoil starter is a standard replacement for the high-performance 50cc to 60cc blower platforms. Key compatible models include:

• Husqvarna: 150BT, 150BF, 350BT, 350BF.
• Redmax: EBZ5100, EBZ5100Q, EBZ5150.
• Echo: EB630, EB630(EPA), EB630RT.
• Note: While many starters look similar, ensure your 4-bolt mounting pattern matches the circular orientation of the 502843101 series.

When to Replace

• Rope Won't Retract: The internal recoil spring has snapped or become unhooked, leaving the pull cord hanging loosely from the blower.
• Slipping or "Grinding": The internal plastic pulley or the starter dogs (pawls) are worn down, causing the starter to spin without engaging the engine flywheel.
• Cracked Housing: The black plastic casing is cracked around the mounting bolts, leading to internal component misalignment and frequent rope breakage.
• Seized Pulley: The internal pulley has melted or jammed due to friction heat or accumulated debris, making it impossible to pull the rope.
• Broken Starter Handle: The handle has snapped or the rope has pulled through the knot, posing a safety risk during starting.

Installation Tips

• Clear Debris: Before bolting on the new unit, use compressed air to blow out any grass, leaves, or sawdust from the flywheel area to prevent the new mechanism from jamming.
• Hand-Thread the Bolts: Always thread the 4 mounting screws by hand first. Since these thread into the engine shroud, using an impact wrench immediately can easily cross-thread or strip the holes.
• Check the Pawls: Inspect the metal starter pawls (dogs) on your engine's flywheel. If they are stuck with sap or dirt, clean them with a bit of degreaser so they can swing out and grab the new starter pulley.
• The "Engagement" Pull: To extend the life of your new starter, pull the handle slowly until you feel the dogs engage the flywheel, then give it a short, sharp pull to start. Avoid "snapping" the rope at full extension.
• Anti-Seize: A tiny dab of anti-seize or grease on the mounting bolts can make future removals much easier, especially for commercial blowers exposed to the elements.