The most expensive part in this assembly is the Double Seat Assy.
With all the components that make up the DT400 1978 USA SEAT assembly. The Bolt, Hexagon (509) is the most frequently specified with six applications.
A sample from the products for the Seat include: Band,seat, Bracket, Seat Rear, Damper, Seat, Cover, Single Seat.

COVER, SINGLE SEAT

BAND,SEAT

BRACKET, SEAT REAR

BRACKET, SEAT FRONT

DOUBLE SEAT ASSY

DAMPER, SEAT

YBS66-6 WASHER, PLAIN

YBS67-8 WASHER, SPRING

YBS66-8 WASHER, PLAIN

WASHER(6A1)

NUT(3BM)

NUT, SELF-LOCKING

NUT, U (483)

BOLT (583)

BOLT, HEXAGON (509)

BOLT, HEXAGON

BOLT, HEXAGON (654)

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Buying replacement parts of great standards has become very easy now. Simply browse through the gallery and find out right parts for Yamaha DT400 1978 USA.

DT400 1978 USA

Introduced as a more powerful upgrade from the DT250 and DT360 models, and although not much faster, the DT400 was blessed with prodigious (for a two stroke) amounts of torque and easily became one of the company’s most successful street scramblers, or trail bikes, as they were by now being called. The model proved popular both in Europe and the vital USA market. 
The torque and benign power band combined with good handling, curtesy of the mono-shock chassis, made the machine easy to ride and control but still with enough performance to satisfy the more experienced rider.
The DT400 became a best seller for Yamaha and today still makes a great classic trail machine

YAMAHA DT400 1978 USASEAT

DOUBLE SEAT ASSY

COVER, SINGLE SEAT

BRACKET, SEAT FRONT

BRACKET, SEAT REAR

BOLT, HEXAGON (509)

WASHER(6A1)

DAMPER, SEAT

BOLT, HEXAGON (654)

YBS66-6 WASHER, PLAIN

NUT, U (483)

DOUBLE SEAT ASSY

COVER, SINGLE SEAT

BAND,SEAT

YBS66-8 WASHER, PLAIN

YBS67-8 WASHER, SPRING

NUT

BRACKET, SEAT FRONT

BRACKET, SEAT REAR

BOLT, HEXAGON (509)

WASHER(6A1)

DAMPER, SEAT