Full Engine rebuild

[firegatejeeyamaha]

I am looking to put full effort to get my bike going. The motor needs a full rebuild wondering if any one has a build on this or on some direction i should take all input would be great.

 

[arfstrom]

So you don't forget, some of us might not remember what you driving, otherwise, Use the word build for a search word in the Photos, I remember one of us did a step by step, with a pre 1980 bike.
http://www.xs400.com/media/albums/228/
ThePsuedoMonkey was the one I was thinking of. 187 photos

 

[volcomskater77]

http://www.xs400.com/forum/showthread.php?t=4843

This should get you started. I did my rebuild (standard bore rings are really expensive, like 140 a pair) I just downloaded the PDF of the manual on the site, printed it and used that. The if I had a problem I searched the forum, there's almost everything you need. Lemme know if you got any problems. And don't Misalign the tranny gears. Or bolt the cases together w/ no gasket material lol.

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[firegatejeeyamaha]

Ok well its a 1980 xs 400 here are some beginner pics.

 

[firegatejeeyamaha]

Made some progress today got the cases all cleaned up and started to get everything inline to put back together. The only question I might have is should i replace the couplers under and over the the crank

 

[bcware]

The bearings? You're supposed to measure the clearances to see if they are within spec. Use plastigauge: http://www.plastigaugeusa.com/how.html

 

[firegatejeeyamaha]

No not the bearings they are the little half moon shaped pieces. Circling that goes under and over the crank and also under the transmission

 

[bcware]

Do they look like this?

 

[firegatejeeyamaha]

Yes those for the crank and the others for the transmission gears

 

[bcware]

Those are bearings, just so you know. The procedure for how to check them is in the service manual.

 

[Drewcifer]

Bc, that was very polite of you, since until we've seen them almost everyone thinks of spherical bearings instead of ring bearings like those you taught our friend about.

Bearings are smooth surfaces to reduce friction, Not necessarily spheres!