STIHL MS 170 Starts Then Dies
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
86%
CONF
|
Carburetor Assembly
The MS 170 carburetor uses a flexible diaphragm to pump and meter fuel based on engine vacuum. Over time, ethanol exposure causes these diaphragms to stiffen, preventing them from pulsing correctly once the engine is running under its own power. Replacing the assembly restores the correct air-fuel ratio and ensures the internal fuel pump can overcome the tank's head pressure.
SKU: 1130 120 0603
|
|
|
8%
CONF
|
Fuel Line
Rubber fuel lines on small saws often develop hairline fractures or lose their seal at the tank entry point. As the engine starts and creates a vacuum, these cracks allow air to be sucked into the fuel stream (cavitation), leaning out the mixture until combustion can no longer be sustained. A new line ensures a vacuum-tight seal for consistent fuel delivery.
SKU: 1130 358 7700
|
|
|
6%
CONF
|
Spark Arrestor Screen
The spark arrestor is a fine mesh screen located in the muffler outlet that captures hot carbon particles. If it becomes clogged with carbon (due to rich oil/fuel mixtures or low-RPM operation), it creates excessive backpressure. This prevents the engine from effectively scavenging exhaust gases, leading to a stall seconds after the initial start.
SKU: 1130 141 9000
|
DIY Repair Guide
Watch exactly how to replace the Carburetor Assembly.
// 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.