Jonsered 737441000 Piston Circlip Locking Ring

Product Description

The JONSERED 737441000 is a piston circlip locking ring designed to retain the piston pin within the piston assembly of compatible JONSERED chainsaw engines. This small but critical internal engine component prevents lateral movement of the wrist pin during operation, maintaining proper piston-to-connecting-rod alignment. It is a direct OEM-style replacement part installed during engine rebuilds, piston replacements, or top-end service work. Licensed small-engine technicians and experienced power equipment mechanics are the primary installers of this component.

This locking ring is used in the top-end assembly of JONSERED two-stroke chainsaw engines. It seats into a machined groove inside the piston boss to lock the wrist pin in place. Applications span the JONSERED 2041 through CS-2147 EPA model range. This part is typically replaced any time the piston is removed, as circlips are considered single-use components and should not be reinstalled once removed.

Key Features

• OEM part number 737441000 ensures direct fitment for specified JONSERED models
• Retains piston wrist pin to prevent lateral movement under engine load
• Designed for use in two-stroke chainsaw top-end assemblies
• Should be replaced each time the piston is disassembled, per standard engine rebuild practice

Compatibility

Compatible with JONSERED chainsaw models 2041 through CS-2147 EPA series as stated by the manufacturer.

Installation Notes

Installation of piston circlips requires the engine to be fully shut down, cooled, and the fuel system depressurized before disassembly. A small-engine technician should use the appropriate circlip pliers to seat the ring fully and evenly into the piston groove without distorting the clip. Never reuse a previously installed circlip, as deformation during removal compromises retention. Verify the clip is fully seated in its groove before reassembling the cylinder.

Technical Specifications

• Part Type: Piston Circlip Locking Ring
• Application: Two-Stroke Chainsaw Engine Top End

Standard Information

• Brand: JONSERED
• Manufacturer Part Number: 737441000