Direct replacement for Husqvarna 435/440/445/450 series chainsaws with for X-Torq engines. Compatible with OEM 505647301/537423201/540057502 specifications. Engineered for high-torque recoil systems requiring 300+ pull cycles under -20°C to 80°C operating conditions. 🔥 85°C Heat Resistance – Spring steel alloy maintains elasticity ⚙️ 0.1mm Precision – CNC-machined pulleys match 450E grooves (±0.03mm) 🔧 8-Minute Installation – Pre-assembled EPS spring fits 445E starter housing 🛡️ Anti-Corrosion Coating – Zinc-nickel plating resists chain oil erosion Package Contents:1 x Recoil Starter Spring, 1 x Starter Pulley Big, 1 x Starter Pulley Small, 1 x Starter Rope, 1 x EPS Spring RUURUU Pro-Grade Starter System Solution

Direct replacement for Husqvarna 435/440/445/450 series chainsaws with for X-Torq engines. Compatible with OEM 505647301/537423201/540057502 specifications. Engineered for high-torque recoil systems requiring 300+ pull cycles under -20°C to 80°C operating conditions.

• 🔥 85°C Heat Resistance – Spring steel alloy maintains elasticity
• ⚙️ 0.1mm Precision – CNC-machined pulleys match 450E grooves (±0.03mm)
• 🔧 8-Minute Installation – Pre-assembled EPS spring fits 445E starter housing
• 🛡️ Anti-Corrosion Coating – Zinc-nickel plating resists chain oil erosion
• ✅ RUURUU Validated – 500-cycle durability test

Package Contents: 1 x Recoil Starter Spring, 1 x Starter Pulley Big, 1 x Starter Pulley Small, 1 x Starter Rope, 1 x EPS Spring