Stihl Inlet Needle Spring - OEM Number: 1129-122-3001

The Stihl Inlet Needle Spring (OEM 1129 122 3001) is a genuine replacement carburettor component designed for use on selected Stihl petrol-powered outdoor power equipment. The inlet needle spring works in conjunction with the inlet needle and metering lever within the carburettor, helping to regulate fuel flow into the metering chamber and maintain the correct fuel level for efficient engine operation.

Manufactured to OEM specifications from high-quality spring steel, the inlet needle spring is engineered to provide consistent spring tension while withstanding vibration, fuel exposure, and continuous engine operation. Precision-manufactured for an accurate fit, it is designed as a direct replacement component to restore reliable carburettor performance and smooth engine operation.

FUNCTION AND OPERATION

• Regulates the movement of the carburettor inlet needle
• Maintains the correct fuel level within the metering chamber
• Helps ensure accurate fuel delivery to the engine
• Promotes reliable starting and smooth engine operation
• Provides consistent spring tension under demanding operating conditions
• Designed for long-term carburettor performance

TECHNICAL DETAILS

• OEM Part Number: 1129 122 3001
• Type: Inlet needle spring
• Function: Carburettor fuel metering
• Application: Selected Stihl petrol-powered equipment
• Material: High-quality spring steel
• Design: OEM direct replacement component

TYPICAL APPLICATIONS

Suitable for selected Stihl equipment, including:

• Chainsaws
• Disc cutters - TS410, TS420
• Brushcutters
• Blowers - BG86
• Shredder Vacuums - SH86
• Other Stihl machines fitted with the compatible carburettor

Always verify compatibility using the machine model and serial number before ordering, as inlet needle springs can vary in size, spring rate, and application between machine models and carburettor revisions.

IMPORTANT INFORMATION

Always confirm the correct OEM part number, machine model, serial number, and carburettor specification before ordering, as inlet needle springs are manufactured to precise dimensions and tension specifications. Installing the correct component is essential to ensure accurate fuel metering, reliable engine performance, and efficient fuel consumption.

Common signs of a worn or damaged inlet needle spring include difficult starting, poor idling, inconsistent engine performance, fuel flooding, lean running, or erratic carburettor operation. When replacing the inlet needle spring, it is recommended to inspect the inlet needle, metering lever, diaphragms, gaskets, and carburettor body for signs of wear or damage. Replacing worn associated components at the same time will help maximise the reliability and service life of the complete carburettor assembly.

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.