General Category > General Discussion
Guide & Valve Seat Replacement
John A:
Some shops don’t have stones small enough.
PeteS:
Stones are pretty old school. The best shops will have something like a Serdi seat cutter. I have some Neway cutters but can’t match professional work.
Pete
John A:
--- Quote from: PeteS on March 23, 2025, 09:29:50 PM ---Stones are pretty old school. The best shops will have something like a Serdi seat cutter. I have some Neway cutters but can’t match professional work.
Pete
--- End quote ---
Yeah, I was going to mention cutters but my mind was on old school. It’s a smaller combustion chamber than a lot of automotive engines and the outside diameter of the cutters and stones is where the trouble is.
Dukedesmo:
When I wanted the valve guides replacing on my LM2 (due to a piston to valve incident) I was concerned that, according to my research, the heads are easy to damage whilst removing/refitting guides and NLA to purchase new if damaged so I opted for K-line valve guide liners.
Basically they bore through the existing guides and insert the K-line inserts which are supposed to be better than solid guides and are used in many motorsports (the place that did mine said they did them for Formula 1 racing teams).
Obviously a specialised job but no more expensive than new guides and they've been fine since.
moto:
--- Quote from: Dukedesmo on March 24, 2025, 06:05:21 AM ---...
I opted for K-line valve guide liners.
...
no more expensive than new guides and they've been fine since.
--- End quote ---
Ditto
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