Products Description
MS660 Chainsaw Piston Bearing 12x17x13mm – Needle Bearing for 91cc Professional Saws
High-Performance Wrist Pin Bearing for Stihl 064, 066, MS650 & MS660
The 12x17x13mm piston bearing is a critical wear component in the upper connecting rod assembly of large-displacement Stihl chainsaws . Positioned inside the small end of the connecting rod, this needle bearing supports the piston pin (wrist pin), allowing the piston to pivot smoothly during the combustion cycle. It is engineered to withstand extreme mechanical loads and the high operating temperatures of professional forestry saws. This bearing directly replaces the Genuine Stihl part number 9512 003 3281 and fits saws from the 064 through the 066 and MS660 series . Over time, it is subject to wear and should be replaced during any top-end overhaul to prevent metal fatigue and catastrophic engine failure.
Technical Profiles & Materials
High-Load Needle Roller Design – The bearing uses multiple needle rollers in a cage to provide a large contact surface area, distributing the force from combustion over the wrist pin and connecting rod.
Critical Wear Component – As a high-friction part, the piston bearing is subject to wear and must be replaced during top-end rebuilds to maintain proper engine tolerances and prevent premature piston or crankshaft damage.
Precision German/Japanese Manufacturing – Available as a genuine OEM part, which is recommended by professional mechanics for exact fitment and longevity.
Available in Service Kits – This bearing is a common inclusion in complete top-end gasket and seal kits, providing a convenient all-in-one solution for engine rebuilds.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Part No. | 9512 003 3281 |
| 2 | Inner Diameter (ID) | 12 mm |
| 3 | Outer Diameter (OD) | 17 mm |
| 4 | Width (Thickness) | 13 mm |
| 5 | Type | Needle roller bearing (caged) |
| 6 | Material | High-grade steel (hardened) |
| 7 | Application | Wrist pin / Piston assembly |
| 8 | Compatible Models | Stihl 064, 066, 066 Magnum, MS650, MS660, MS660 Magnum, MS661 C-M (early) |
| 9 | OEM Cross-Ref | 9512 003 3281 |
Quality and Craftsmanship Details
Products Package
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FAQ
Q: How do I confirm this bearing fits my chainsaw?
A:Check the model number on your powerhead. This bearing fits the Stihl 064, 066, MS650, and MS660 series. It is an exact replacement for the OEM part #9512 003 3281. Refer to your service manual for the specific part reference.
Q: Is an aftermarket bearing as reliable as the OEM version?
A: The OEM bearing is manufactured to Stihl's exact specifications and is the preferred choice for professional rebuilds to guarantee correct fitment and longevity. Genuine part #9512 003 3281 is readily available through authorized dealers and is recognized as the correct fitment for the 066 and MS660 piston assembly.
Q: What is the difference between this bearing and the clutch drum needle bearing?
A: This bearing (12x17x13mm) is used in the piston assembly at the top of the connecting rod. The clutch drum bearing is typically a different size (e.g., 10x16x13mm) and is located at the opposite end of the crankshaft. They are not interchangeable.
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