Karvayna C1Q-S174 Carburetor Tune-Up Kit for STIHL FS90R/FS110R & KM Series

Revitalize your STIHL trimmer with a complete tune-up kit

The Karvayna C1Q-S174 carburetor tune-up kit is designed to bring steadier idle, smoother throttle response, and reliable operation across multiple STIHL models. It blends an OEM-style throttle connector with practical, field-ready components to make maintenance simpler and more predictable.

Key benefits that matter in the field

• OEM-style throttle cable connector fits precisely for smooth throttle control, helping the engine idle and respond predictably.
• Direct-fit fuel return line simplifies installation and supports steady fuel flow during operation.
• Two types of fuel hoses cover both older and newer engine models, minimizing compatibility worries.
• Factory pre-tuned and rigorously tested for consistent performance across use cycles.

Whether you’re tackling routine maintenance or restoring a shed-found machine to near-new behavior, this kit offers a practical path to improved performance without guesswork. The combination of a durable carburetor, essential consumables, and thoughtfully selected hoses helps you complete a full tune-up with confidence.

What’s inside the package

• 1 carburetor
• 1 air filter
• 1 spark plug
• 1 fuel filter
• 1 molded black fuel line
• 1 fuel line connector
• 1 molded green fuel line
• 2 feet of hose
• 2 gaskets

Compatible models and practical use cases

Designed for STIHL FS90R, FS90, FS110R, FS110, KM90R, KM110R, HT101, HL100 and related trim applications. The kit’s components are chosen to support quick, reliable maintenance, whether you’re replacing worn parts after heavy use or performing a routine tune-up before a busy season.

In practice, you may notice more predictable idling, steadier throttle response, and easier start-up with a kit that emphasizes both fit and long-term reliability. The goal is to provide the parts you need to restore and maintain engine performance without requiring specialized tools or complicated procedures.