Stihl 3/8" Picco 7 Tooth Spur Sprocket Kit - MS191T

Restore peak cutting speed and factory throttle response to your commercial top-handle arbor saw with the genuine OEM STIHL 3/8" Picco 7-Tooth Spur Sprocket Kit. Precision-engineered to match the specialized powerband of the high-torque STIHL MS 191T, this factory replacement clutch drum replaces worn, grooved, or heavily hooked drive systems. Replacing your drive sprocket at the first sign of wear is essential to prevent rapid chainsaw chain destruction, excessive bar rail friction, and erratic clutch engagement during precise climbing cuts.

This original equipment manufacturer spur sprocket features a premium, case-hardened 7-tooth drive gear structurally integrated into a heavy-duty steel drum shell. Upgrading or renewing with a 7-tooth configuration increases linear chain velocity across the guide bar, allowing arborist crews to clear limbs, drop branches, and slice through hardwood faster at high RPMs. The precisely spaced spur tracks guide the chain chassis smoothly onto the hub, mitigating structural chain slap and stabilizing the loop during demanding overhead cuts.

True OEM Integrity vs. Soft Aftermarket Metal: Commercial arborist work forces chainsaws through rapid, high-torque cycles that will destroy un-hardened aftermarket drive drums in days. Imprecise non-OEM parts introduce loose inner diameter tolerances, causing harmonic crankshaft vibrations that rapidly ruin the needle cage bearing, deform the oil pump drive gear, and fatigue clutch springs. A genuine STIHL sprocket ensures flawless concentricity and metallurgy to safeguard your professional powerhead.

Configuration & Fitment Note: Designed as a direct factory replacement component explicitly for the STIHL MS 191T top-handle chainsaw running a 3/8" Low Profile (Picco) pitch chain loop (.043" or .050" gauge). This setup will not accept standard .325" or full-profile .375" professional chain. The package consists of the genuine 7T spur sprocket drum body ready for direct installation.

Key Features & Benefits

• High-Velocity 7-Tooth Design: Maximizes linear chain speed across the guide bar to streamline high-production tree care and commercial pruning.
• Integrated Spur Sprocket Structure: Unified steel construction ensures absolute concentricity, preventing power loss or imbalance under peak load.
• 100% Genuine OEM STIHL Manufacture: Built to precise original factory blueprints using high-carbon steel alloys for maximum wear resistance.
• Smooth Chain Transition Tracks: Hardened guide faces accept chain drive links evenly to significantly mitigate friction, heat, and chain stretch.
• Perfect Needle Cage Alignment: Inner bore diameter matches the MS 191T crankshaft dimensions exactly to ensure smooth, vibration-free rotation.
• Arborist Service Reliability: Eliminates unexpected equipment failure and costly crew downtime on high-stakes tree-climbing projects.

Technical Specifications & System Components