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.