Stihl Flywheel - OEM Number: 4149 400 1200

The Stihl Flywheel (OEM 4149 400 1200) is a genuine replacement flywheel designed for use on selected Stihl professional brushcutters, hedge trimmers, and KombiEngines. Mounted directly onto the engine crankshaft, the flywheel stores rotational energy to provide smooth engine operation while incorporating permanent magnets that operate the electronic ignition system. It also features integral cooling fins that direct airflow over the engine to assist with temperature control during operation. Stihl identifies 4149 400 1200 as the genuine flywheel for a range of 94-series machines.

Manufactured to OEM specifications, the flywheel is precision-balanced to minimise vibration and ensure reliable engine performance. Its robust cast aluminium construction provides excellent durability, while the integrated magnet assembly delivers accurate ignition timing and dependable starting throughout the engine's operating range.

FUNCTION AND OPERATION

• Stores rotational energy for smoother engine operation
• Operates the electronic ignition system via integrated magnets
• Drives cooling airflow across the engine cylinder and crankcase
• Provides the engagement surface for the recoil starter mechanism
• Helps maintain consistent engine speed and reliable starting
• Designed for demanding professional landscaping applications

TECHNICAL DETAILS

• OEM Part Number: 4149 400 1200
• Type: Engine flywheel / ignition rotor
• Function: Engine momentum, ignition timing and cooling
• Application: Stihl 2-stroke professional power equipment
• Construction: Precision-balanced cast aluminium
• Features: Integrated ignition magnets and cooling fins
• Design: Genuine OEM direct replacement component
• Alternative Format: 41494001200

TYPICAL APPLICATIONS

Suitable for selected Stihl equipment, including:

• Stihl FS 94
• Stihl FS 94 C
• Stihl FS 94 R
• Stihl FS 94 RC
• Stihl HL 91 K
• Stihl HL 91 KC
• Stihl HL 92 C
• Stihl HL 92 KC
• Stihl HL 94
• Stihl HL 94 C
• Stihl HL 94 K
• Stihl HL 94 KC
• Stihl KM 94 R
• Stihl KM 94 RC
• Stihl SP 92 C
• Stihl SP 92 TC

IMPORTANT INFORMATION

Always confirm the correct OEM part number, machine model, and serial number before ordering, as Stihl has used several flywheel designs across the 94-series engine range. Although 4149 400 1200 fits many compatible models, fitment should always be verified against the machine's serial number or illustrated parts list.

A damaged or incorrectly fitted flywheel can cause difficult starting, ignition timing issues, excessive vibration, poor cooling performance, or recoil starter engagement problems. When replacing the flywheel, it is recommended to inspect the ignition module, flywheel key, crankshaft taper, recoil starter pawls, starter cup, and spark plug. Any cracked cooling fins, damaged magnets, or worn starter engagement surfaces should be addressed promptly to ensure reliable engine performance and long service life.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£30.00 for delivery before 10:30am
£25.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.