Harley Davidson competition racer (model KR, KR-TT, XLR-TT). Specification and instruction (1961) - page 1
GENERAL SPECIFICATIONS
KR ENGINE SPECIFICATIONS
HEAD GASKET: No head gasket 1в used. When assembling head to cylinder,
clean both
surfaces and apply a thin coat of aluminum paint (metallic) as a sealer
to both
cylinder and head. Heads and cylinders should occasionally be resurfaced
on a surface
plate using fine emery paper to assure a proper seal.
CYLINDERS; The "KR" cylinders are honed straight to 2.747", and can be
rebored .045'
oversize and still be within Class C regulations. Maximum bore 2.792".
PISTONS: Тhе pistons are cam ground (aluminum). The required clearance
between
the piston and-cylinder head is .035/.0U0” and it should be checked if
the piston, head or cylinder is changed. The pistons are fitted with
.007" clearance. Measure for clearance at bottom of skirt. When
assembling, piston and rings are to be liberally coated with clean
Harley-Davidson 105R oil.