Products Description
Chainsaw Piston Needle Bearing – Wrist Pin Bearing for 2-Stroke Engines
Precision Needle Cage for Piston & Connecting Rod Assembly
The piston needle bearing (also called a wrist pin bearing or small-end bearing) is a critical component that connects the piston to the connecting rod in your chainsaw engine. It allows the piston pin to rotate smoothly during the combustion cycle, reducing friction and enabling efficient power transfer. Available in a wide range of dimensions to fit specific chainsaw models, this high-quality replacement part is essential for any top-end rebuild or engine overhaul.
Technical Profiles & Materials
Precision Needle Roller Design – Features a caged needle roller assembly that distributes load evenly, supporting smooth rotation of the wrist pin within the connecting rod's small end. Manufactured from hardened bearing steel for durability under high RPM and load.
Common Size Configurations – Standard dimensions include 10x13x10mm, 10x14x13mm, 10x16x12mm, and 11x14x15mm. Size varies by model, so always confirm your existing bearing dimensions before ordering.
Critical Engine Component – The bearing enables the piston to pivot on the connecting rod during the combustion cycle. Worn bearings cause knocking, vibration, and potential seizure, making timely replacement crucial during any top-end service.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Bearing Type | Needle roller bearing (caged) |
| 2 | Material | Hardened bearing steel |
| 3 | Common Sizes | 10x13x10mm, 10x14x13mm, 10x16x12mm, 11x14x15mm |
| 4 | Application | Piston pin / wrist pin – connecting rod small end |
| 5 | OEM Cross-Reference | 9512 933 2379, 9512 003 2340, 9512 003 2348, 501 45 16-01 |
Products Application
Top-End Engine Overhaul
Essential component during piston and cylinder replacement. When installing a new piston, the wrist pin bearing should always be renewed to ensure proper clearance and prevent premature failure. Many rebuild kits include the bearing alongside the piston, rings, and circlips.
Engine Knock & Vibration Diagnosis
A worn piston bearing often produces knocking sounds from the upper engine area, especially under load. If you feel excessive play when moving the piston side to side, the bearing needs replacement. Manuals recommend changing it if you can detect movement or if the needles show signs of wear, scoring, or cage damage.
Chainsaw Restoration & Maintenance
For professional and DIY repairs on high-hour saws, replacing the piston needle bearing during regular maintenance prevents catastrophic engine failure. Always lubricate the new bearing with two-stroke oil before installation to ensure proper break-in.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm which bearing size fits my chainsaw?
A:Measure the inner diameter (shaft/pin size), outer diameter, and width of your existing bearing. Alternatively, check your chainsaw model number and cross-reference with OEM part numbers such as 9512 933 2379 (Stihl), 9512 003 2340 (Stihl MS290), or 501 45 16-01 (Husqvarna).
Q: What are the symptoms of a worn piston needle bearing?
A: Symptoms include knocking or rattling sounds from the upper engine area (especially under load), excessive piston movement when gently rocked side to side, loss of power, and eventually engine seizure if not addressed. Replacing a worn bearing is a low-cost repair that prevents expensive engine damage.
Q: Should I replace the bearing when replacing the piston?
A: Yes. The piston needle bearing is a wear component under extreme stress. Installing a new piston without replacing the bearing risks premature wear on the new piston and connecting rod. Professional rebuild kits always include the bearing to ensure all components are renewed together.
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