Yamaha Z250D Посібник з експлуатації - Сторінка 11

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Features and benefits

Hemispherical combustion chambers have been incorporated in the cylinder head to realize a high

compression ratio of 6.2.

The exhaust ports have been chamfered to reduce loss of the exhaust gases.

Also, an exhaust shell has been adopted to allow exhaust gases flow out smoothly.

The plateau honing process has been used in the cylinder sleeves to reduce friction.

The spark plugs have been offset from the center of the cylinder head to keep the fuel injectors

away from high temperatures.

The fuel injectors are located on the exhaust side of the combustion chambers. Fuel is injected

toward the tumble due to scavenging to obtain the optimum air-fuel mixture.

Special twin corrugated washers have been adopted in the injectors to prevent fuel in an injector

from carbonizing due to exhaust heat.

NOTE:

Install the washers so that the shorter metal guard ends contact each other.

1 Injector

2 Spark plug

3 Corrugated washers

60V3E11

Identification / Features and benefits

S60V1130

1-6