Husqvarna Starter Spring For Chainsaw OEM #540057502

When your chainsaw won’t snap back on the pull cord, the culprit is almost always the recoil starter spring. The Genuine OEM Husqvarna Starter Spring #540057502 — also called the spring cassette assembly — is the factory-engineered solution that restores smooth, snappy rope retraction and gets your saw starting reliably again.

Also referred to as a recoil spring, this OEM replacement part is used to rewind the pull rope back into the starter housing. If the pull cord will not retract into the housing, the recoil spring should be inspected for signs of wear or damage and replaced if necessary. A fatigued or snapped spring is one of the most common causes of pull-start failure, and replacing this cassette is one of the most cost-effective chainsaw repairs you can make.

Genuine OEM Husqvarna Part #540057502 fits specific Husqvarna 435, 435e, 440e, 445, 445e, 450, 450e, and 455 Rancher II model chainsaws. It is also compatible with Husqvarna 135, 135e, 140, 140e, 435 II, 435e II, 440 II, 440e II, 445 II, 445e II, 450e II, 455 Rancher II, 455e Rancher II, and Jonsered CS2240, CS2240 S, CS2245, CS2245 S, CS2250, and CS2250 S chainsaws.

This part replaces the obsolete OEM part #540057501, making it the current go-to replacement for anyone searching that legacy part number. This is an OEM authorized part that fits various Husqvarna models and is made in the United States.

As a genuine Husqvarna component, the spring cassette is tempered and dimensioned to the exact factory specification — ensuring consistent tension, proper rope retraction speed, and long-lasting durability through thousands of pull-starts in demanding field conditions.

Key Features:

• Genuine Husqvarna OEM spring cassette assembly — factory-authorized, made in the USA
• Restores proper pull cord retraction for reliable chainsaw starting
• Direct replacement for worn, fatigued, or broken recoil springs
• Replaces obsolete OEM part #540057501
• Compatible with Husqvarna 135, 140, 435, 435e, 440e, 445, 445e, 450, 450e, 455 Rancher II, and select Jonsered CS-series chainsaws
• Sold individually as a cassette assembly

OEM Part Number: 540057502 Replaces: 540057501 Brand: Husqvarna Part Type: Recoil Starter Spring / Spring Cassette Assembly Country of Origin: USA Compatible Equipment: Chainsaw