Sign in to follow this  
Followers 0
5valve

cylinder head reconditioned..cylinder head and cylinder gasket 400's

1 post in this topic

Have a '99 WR.

Got cylinder head gasket and cylinder gasket off ebay, ment for YZ 400 '98.

Part numbers are:

5GR-11181-00-00 for head

5BF-11351-00-00 for cylinder.

But for '99 WR are:

5BE-11181-00-00 for head

5BE-11351-00-00 for cylinder.

Visually can't distinguish head gasket diffrences, but with cylinder gasket, there is a thickness diffrence...WR measuring 1.1 mm or 0,043 inch and YZF measuring 0,6 mm or 0,023 inch.

What can I expect with thinner gasket..higher comppression or piston hitting valve. Cyl and head codes WR and YZ also differ slightly.

Second thing, more like a job well done is fine tuning the head.

Reconditioning valve seats and valves and also head surface leveling.

Yamaha uses only two angles on the seat, I have now three angles and also angles are diffrent for better flow.

Valves are suited, to fit the angle of course.

This is 9 years old head, first valves, everything in spec, only valves were a bit leaky, so I was loosing a bit compression and that was probably reason for a bit higher oil drainage from head vent tube and quick oil contamination.

Since I also have reconditioned cylinder, presume I'll ride quality now.

20080319221036_DSC05445.JPG

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0