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CB750 Oil Control Orifice (early diecast K0).

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Trigger:
They have to come out to be cleaned. This is one of the main problems why the engine has no oil to the top end and the cam shaft snaps.
One way to test what jet are in the K1 is, to run a magnet over the jet. If it is the early type the magnet will pick it up as it is steel, the later ones are alloy ;)

MrDavo:
My K1's quite a late number, so I wasn't surprised to find the jet isn't magnetic  :( If had been steel in alloy, heat would loosen it, as it is, it won't make a difference.

A blast of brake cleaner and air in a can all came out of the stud tunnel, with no visible crud, and the motor was freshly rebuilt, so I'll settle for that.

Trigger:
They still have to come out to be cleaned, the alloy type come out very easy.

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