I heard a good trick to counteract 'cupping' where the valve sits against
the rocker.
Essentially the problem is that, if the contact point ono the rocker has
been hollowed out a little by wear over time, when you slip in your feeler
gauge, it sits over the top of this hollow. Therefore, what you get as a
gap is the thickness of the gauge plus the depth of the hollow.
To couunter this, you need to know the pitch of the thread. Then, you
tighten up the adjuster until there is no clearance left. By backing off by
a set number of degrees, you will get the exact clearance you require.
The only problem is, I'm not sure what the thread pitch is...
Richard & Daffy
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