Products Description
4500/5200/5800 Chainsaw Flywheel – Ignition Rotor & Cooling Fan
Precision Flywheel for 45cc–58cc Chinese Chainsaws
The flywheel is a critical engine component on Chinese 4500, 5200, and 5800 chainsaws, serving two essential functions: its outer magnetic poles generate electricity for the ignition coil to produce spark, and its rotating fins create airflow to cool the engine cylinder and crankcase . Replacing a damaged flywheel resolves issues such as incorrect ignition timing, hard starting, misfires at high RPM, and insufficient engine cooling . This flywheel is a direct replacement for Chinese 45cc, 52cc, and 58cc chainsaw engines, designed to meet original equipment specifications.
Technical Profiles & Materials
Precision Ignition Component – Works with the ignition coil to generate electricity for reliable spark timing, enabling the engine to start and run smoothly under load .
Engine Cooling Function – Integrated cooling fins draw air over the cylinder and crankcase during operation, maintaining safe operating temperatures to prevent overheating during extended cutting .
OEM-Spec Replacement – Directly replaces flywheels on Chinese 4500, 5200, and 5800 chainsaws, as well as 45cc, 52cc, and 58cc engines. Compatible with multiple clone brands .
Durable Metal Construction – Manufactured from robust metal to withstand the vibration and torque of chainsaw use. Standard keyway design ensures proper alignment with the crankshaft.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Models | Chinese 4500, 5200, 5800 chainsaws |
| 2 | Engine Sizes | 45cc, 52cc, 58cc |
| 3 | Outer Diameter | 100mm |
| 4 | Shaft Diameter | 12mm |
| 5 | Keyway | Standard Woodruff key |
| 6 | Material | Metal |
| 7 | Function | Ignition timing & engine cooling |
| 8 | Unit of Sale | 1 piece |
Products Application
Ignition System Restoration
Direct replacement when the chainsaw has weak or no spark, hard starting, or misfires at high RPM. A damaged flywheel magnet or incorrect keyway alignment can disrupt ignition timing. Replacing the flywheel restores reliable spark generation and engine performance .
Engine Overheating Repair
When cooling fins are damaged or broken, the engine may overheat during extended cutting. Replacing the flywheel restores proper airflow and prevents overheating-related engine damage .
Chainsaw Restoration & Maintenance
For Chinese 4500/5200/5800 chainsaws being rebuilt or restored, replacing the flywheel ensures proper ignition timing and engine cooling. A damaged keyway or weakened magnet can cause significant performance issues.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FOR 10000+ OUALITY PARTS
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FAQ
Q: How do I confirm this flywheel fits my chainsaw?
A:Check your chainsaw model and engine size. This flywheel fits Chinese 4500, 5200, and 5800 chainsaws with 45cc, 52cc, or 58cc engines . The outer diameter is 100mm and shaft diameter is 12mm .
Q: What are the symptoms of a damaged flywheel?
A: Common symptoms include hard starting, weak or no spark, misfires at high RPM, lack of power, and insufficient engine cooling. A damaged keyway can cause the flywheel to shift, affecting ignition timing and engine performance .
Q: What tools do I need for installation?
A: A flywheel puller is recommended to remove the old flywheel without damage. You will also need a basic socket set (typically 14mm or 17mm for the retaining nut) and a torque wrench for proper installation.
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