The STIHL MS070 and MS090 series petrol saws have a separate drive pulley (separate pinion).

Is your large, classic STIHL chainsaw experiencing problems such as reduced cutting performance, chain slippage, or excessive wear on the drive teeth? This is likely due to a worn drive sprocket after extended use. This high-quality, removable drive sprocket is specifically designed for large, classic chainsaws like the STIHL 070, 090, MS070, and MS090. Thanks to its removable design, maintenance is simple, and the various available pitches cover a range of applications. How the removable drive sprocket works: The drive sprocket is the toothed disc mounted on the clutch that transmits power from the clutch to the chain. Its condition directly affects the efficiency and stability of the drive. A heavily worn drive sprocket can cause chain slippage, reduced cutting performance, and even an increased risk of chain breakage. Advantages of the removable design: Economical: When worn, only the sprocket itself needs to be replaced; there's no need to replace the entire sprocket or clutch assembly, which reduces maintenance costs. Flexible Interchangeability: Depending on cutting requirements, sprockets with different tooth counts or pitches can be used to adapt to various chainsaw chains and applications. Easy Maintenance: Disassembly is straightforward; sprocket changes can be performed without special tools. Key Features: Exact Reproduction to Original Specifications: Manufactured to precisely match the dimensions, inner diameter, and mounting position of the original manufacturer's split drive pulley, ensuring perfect compatibility with your chainsaw. Once installed, the sprocket sits snugly in the clutch. Two Pitch Options: 3/8" Pitch: Standard universal pitch, suitable for most chainsaw chains and offering a balanced ratio between cutting speed and power. 404" Pitch: Unreinforced, with thicker links, suitable for very large log diameters, hardwood cutting, and demanding professional applications, offering superior tensile strength. Various Tooth Count Options: Available with 7, 8, and other tooth counts. More teeth result in higher chain speeds but require more torque. Fewer teeth result in higher torque but lower speed. Please select according to your chainsaw's power and typical cutting conditions. Wear-resistant, hardened layer: The depth and hardness of the tooth surface hardening are strictly controlled. This ensures excellent wear resistance while maintaining core strength and preventing brittle tooth tip breakage. Matching bearing bushings: The set includes precision-machined bearing bushings with smooth inner bores. These ensure a perfect fit in the clutch, smooth sprocket rotation, and reduced frictional wear. Specifications: Part name: Split drive pulley / Split pinion / Gear set. Compatible models: STIHL 070, STIHL 090, STIHL MS070, STIHL MS090, STIHL 041, STIHL 051, STIHL 075, STIHL 076, STIHL 08S, STIHL Contra, STIHL Contra S