Harley Davidson competition racer (model KR, KR-TT, XLR-TT). Specification and instruction (1961) - page 2

METHOD FOR CORRECTING CLEARANCE OVER VALVES

MODIFICATIONS FOR XL MODELS
Install intake valve, part number 18069-65R (1 15/16" dia.).

Do not enlarge the intake port except to blend the enlarged valve seat to the present intake port diameter (see illustration). A smooth radius must be obtained.

NOTE: A minimum of .060” clearance is required between the valve and the piston. This may be checked by using modeling clay in the valve pocket and rotating the engine with the cylinder head installed.
Polish the intake and exhaust ports and intake manifold:

Caution: Do not remove excessive amounts of material. This will only decrease performance.

Shim the valve springs, Shims, part number 6649, should be installed under the lower valve spring collar until inner valve spring is within . 015” of being coil bound and outer valve spring is within . 030” of being coil bound when the valve is fully open.

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