STIHL Control Unit / Carburettor - 1138 007 1008

Key Features

• OEM marked STIHL part number 1138 007 1008 for direct factory interchange
• Cast aluminum body with sealed internal fuel transfer passages
• Precision drilled brass main jet and idle circuit for consistent air fuel ratio control
• Dual flexible diaphragm design enabling reliable cold start priming across temperature ranges
• Three hole mounting footprint aligning with standard STIHL engine intake manifolds
• External high and low speed adjustment screws sized for standard maintenance tools

Product Details

This replacement control unit operates as a direct mechanical substitute for saturated or clogged carburetors in professional grade two stroke outdoor power equipment. The assembly utilizes a crankcase pressure activated fuel pump diaphragm paired with a combustion chamber vacuum regulated metering diaphragm to scale mixture delivery precisely to throttle position and RPM. Internal orifice dimensions are machined to maintain target flow parameters without requiring external restrictors. Factory supplied components include baseline calibration screws and a silicone reinforced intake manifold gasket engineered to eliminate unmetered air infiltration and raw fuel seepage at the cylinder head interface.

Compatibility

Provides exact dimensional clearance and airflow characteristics for STIHL machinery fitted with MC series two cycle engines, including:

• Chainsaws: MS 250, MS 251, MS 261, MS W 250, MS W 251
• Brushcutters and Trimmers: FS 230, FS 240, FS 250, FS 260, FS 360, FS 460, FS 560
• Handlebar Systems: KMA 120, KMA 140, KMA 160, KMA 180, MSZ series equivalents

Inspect intake bolt diameter and gasket compression height before installation to maintain proper manifold vacuum sealing and throttle linkage travel.