Honda Valve Guides

While looking up the parts to rebuild my 93 XR600R, the only valve guides are listed as Guide, Valve(OS) What does the OS mean ? I assume oversized, but i dont even see an option for standard size... Do they even make oversized valves ? Should I even replace the valve guides on a rebuild ? This one has me stumped.... Any input would be appreciated.

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"NO FEAR" If you have no fear, you didnt go as fast as you could have ...

I would suggest that a good m/c cylinder head shop manage the rebuilding of your head.

I would suggest KMPI components as they are thoroughly proven in this application.

I would also suggest either Eric Gorr or Mike at EDCO.

Both stand up guys capable of fully refurbishing your head.

I believe the oem replacement rockers now com with a hardened pad on the cam follower so hardfacing is not required.

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