This non-genuine flywheel is a direct replacement for Stihl TS410 and TS420 disc cutters, made to replace OEM part number 4238 400 1202. Cast from durable aluminium alloy in a finned, rotor-style design, it stores rotational energy to keep the engine running smoothly and helps drive cooling airflow around the cylinder. Embedded magnets provide the trigger signal for the ignition module, supporting reliable starting and consistent performance. The flywheel’s taper/keyway geometry is matched to these engines for correct location on the crankshaft. Finished in natural silver-grey aluminium, it is built for everyday use on site and in workshops. It installs using the machine’s existing fixings and covers, making it a practical choice when refurbishing or repairing TS410 or TS420 cut-off saws.

Key Features:
– Non Genuine Part, made as a cost-effective replacement for the original flywheel
– Direct replacement for OEM No. 4238 400 1202
– Die-cast aluminium alloy construction for strength with low rotating mass
– Finned profile promotes effective engine cooling during demanding cutting tasks
– Designed to align with the crankshaft taper and keyway for secure, accurate fitment
– Magnet inserts positioned to suit the ignition module used on TS410/TS420
– Precision-moulded for smooth running and stable idle/acceleration
– Straightforward to fit using existing hardware and standard flywheel tools
– Corrosion-resistant material suitable for outdoor and on-site conditions
– Suitable for routine maintenance, rebuilds, or replacement of damaged flywheels

Typical Applications:
Used to restore smooth running, reliable starting, and effective cooling on Stihl TS410/TS420 cut-off saws used in construction, groundworks, utilities, and landscaping. Ideal when original flywheels have cracked fins, a worn keyway, impact damage, or corrosion, helping maintain consistent cutting performance on concrete, asphalt, masonry, and metal (with the appropriate discs).

Also known as:
Cut-off saw flywheel, magneto flywheel, ignition flywheel, engine rotor, cooling fan flywheel, aftermarket flywheel for Stihl TS series, TS410/TS420 flywheel replacement.

Fits Models:
TS410, TS420

Alternate Part Numbers:
4238 400 1202, 42384001202

Product Specifications