STIHL FS 56 RC Wont Stay Running Without Choke
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
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93%
CONF
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Carburetor C1M-S267A
The internal metering jets and idle bypass ports are obstructed by varnish or debris, preventing the engine from drawing sufficient fuel under normal atmospheric pressure. Engaging the choke creates a higher pressure differential that overcomes the restriction, but once the choke is opened, the air-fuel mixture becomes too lean to support combustion. Replacing the carburetor assembly is the standard resolution as the internal check valves in this specific model are non-serviceable.
SKU: 4144-120-0608
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|
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4%
CONF
|
Fuel Pick-up Body (Filter)
A partially clogged fuel filter in the tank restricts the volume of fuel available to the carburetor's pump diaphragm. This restriction limits the fuel flow rate, forcing the user to use the choke to increase the suction required to pull fuel through the 'clunk' filter. If the filter is saturated with fine particulates or water, it will prevent the engine from running at high RPM or without air restriction.
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|
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3%
CONF
|
Carburetor Gasket Kit
Air leaks at the mounting flange between the carburetor and the engine block introduce 'unmetered air' into the combustion chamber. This dilutes the fuel mixture; using the choke compensates for this excess air by restricting the primary intake. Replacing the gaskets ensures a vacuum-tight seal, maintaining the proper stoichiometric ratio.
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DIY Repair Guide
Watch exactly how to replace the Carburetor C1M-S267A.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.