# Service bulletin M2020\-006

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10176884
- Published by NHTSA: 2020\-07\-02
- Manufacturer's number: M2020\-006
- Manufacturer's date: 2020\-06\-30
- NHTSA component: ENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE; EQUIPMENT

## NHTSA's summary

Certain 2020 YZ250FX Models \- Rich Running Condition \- ECU Reprogramming Some units may experience a condition where the engine is hard to start due to a fouled spark plug. The 2020 YZ250FX’s ignition timing and air/fuel ratio were set to meet this model’s target of good low speed torque for off\-road closed\-course competition. When riding in certain conditions, the slightly retarded ignition timing and richer air/fuel mixture may lead to the spark plug fouling, causing a hard\-starting condition. To remedy this condition, Yamaha has revised the ECU programming to address the rich running condition.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10176884-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10176884-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Equipment and accessories, Fuel system

## Vehicles listed

- 2020 YAMAHA YZ250FX

JSON: [/v1/bulletins/10176884](/v1/bulletins/10176884)

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