Stihl 1/4" Picco 8 Tooth Spur Sprocket Kit - MS150, MS151

Restore flawless throttle response and ultra-clean cutting speed to your precision chainsaw with the genuine OEM STIHL 1/4" Picco 8-Tooth Spur Sprocket Kit. Specially engineered to match the high-RPM power bands of the ultra-lightweight 1146-series engine platforms, this factory replacement drum is built for both the top-handle (T) climbing models and standard rear-handle variants of the MS 150 and MS 151. Replacing a worn, grooved, or hooked drive spur restores immediate power transfer, prevents internal clutch slippage, and eliminates chain chatter during detailed pruning cuts.

This original equipment manufacturer assembly features a precision-machined 8-tooth spur gear integrated directly onto a lightweight steel drum shell. The micro-sized 1/4" Picco configuration is optimized for fine pruning, detail carving, and technical arborist work. By spreading the rotational load across an 8-tooth profile, this sprocket delivers a remarkably smooth, high-velocity chain flow across the guide bar, ensuring clean, bark-protecting cuts without binding. Case-hardened to meet strict commercial specs, the spur tracks guide your narrow-kerf chains into perfect alignment to minimize chassis drag.

True OEM Engineering vs. Substandard Aftermarket Alloy: Ultra-lightweight pruning saws operate at high structural RPMs that can quickly deform un-hardened aftermarket metals. Imprecise non-OEM parts introduce loose tolerances on the crankshaft, causing harmonic vibrations that rapidly destroy the specialized needle cage bearing, score the oil pump drive links, and cause premature centrifugal clutch shoe fatigue. A genuine STIHL drive assembly guarantees absolute concentricity and durability for demanding, high-stakes climbing operations.

Configuration & Fitment Note: Designed exclusively for STIHL 1146-series models configured with a micro-kerf 1/4" Picco (Low Profile) pitch chainsaw chain (.043" or .050" gauge). This specialized component will not accept standard 3/8" Picco or .325" chain loops. The package consists of the genuine integrated 8T spur sprocket drum body ready for direct drop-in installation.

Key Features & Benefits

• High-Velocity 8-Tooth Design: Engineered to maximize linear chain speed for ultra-clean, precise cutting across small branches and pruning zones.
• Unified Structural Spur Structure: Lightweight steel construction provides exceptional concentricity, preventing power loss and balancing climbing-saw dynamics.
• 100% Genuine OEM STIHL Manufacture: Crafted from proprietary heat-treated high-carbon steel to deliver maximum wear resistance against fine masonry or sap-heavy wood abrasive tracks.
• Ultra-Smooth Micro-Chain Delivery: Hardened guide pathways cradle the 1/4" Picco chassis drive links evenly, reducing operational heat, friction, and guide bar rail wear.
• Exact Crankshaft Interface: Inner hub bore dimensions match factory specifications perfectly to ensure a perfectly balanced, vibration-free rotation.
• Versatile Handle Adaptation: Drops seamlessly into both top-handle climbing models (T-series) and standard rear-handle chassis layouts within the 1146 series.

Technical Specifications & System Components