Piston

The piston to liner fit is not correct so a new piston is required the .96 is to small.
Piston pn 510-11631-05-97

Bolt correct rebuild.

Bolt correct rebuild.
What a huge job, a picture tells a thousand words how true. I have owned plenty of race and trail bikes, but never spent so much time on one bike as this, you have not lived until you have built a bike to bolt correct concourse.


CLICK ON IMAGE FOR FULL WINDOW

under side tank

Tank samples

Crank sharft ready for assembley

Con Rod Part numbers

1. Con Rod____________ 431-11651-00-00
2. Pin big end__________ 2x4-11681-00-00 = YZ 250 F 1979
3. Bearing big end_______ 93310-42541-00
4. Washer_____________ 275-11685-00-00

Bikes & Bit Importers. 63 Wandeara Crescent Western Australia, Australia 6073
08-9295-6688 / 08-9295-1962

Owners Manual YZ 250 D and 400D

Engine reference YZ 400D 1W4.

Engine reference YZ 400D 1W4.
These YZs are notorious for the bearing housing coming free from the crankcases.
This one is in excellent condition.

Frames ready for paint

1w4 YZ 400 for the USA

 

Next step paint shop.

YZ 250D1W3 and a YZ 400D1W4
All preparation to the frame work now complete. Now its of the the paint shop for paint preparation. This will entail sand blasting file finishing and filling any stone chips.

This time we are about to do 2 bikes at once. With the similarities of these 2 being close it should prove much faster than one at a time,

Side stand.

The YZ 400 1W4 and YZ 250 1W3 both us the same side stand.

Side stand positioning

Clutch cable clip weld on. Far right.


The position of the side stand bracket is the question. What shape should it be? Where should it be welded?

Parts required

1. Silencer 1w4-14753-00-00

Ready for restoration (1W4)

1977 YZ 400 D (1W4)