K  KK  KR  KRM  KRTT  KH  KHK  KHR  KHRM  KHRTT  and early Sportsters

Welcome to Harley K Model, dedicated to the preservation and restoration of the 1952 to 1956 Harley-Davidson flathead unit‑construction motorcycles, With the alphabet soup of model designations, these bikes are affectionately known as the “K models”.

We also cover the early Sportster models through 1969, as these are essentially K Models with overhead valves. The Ks and early Sportsters share many components and service procedures. And many enthusiasts own both models.

The OSKRG (Old Sportster and K Model Research Group) is a group of individuals who enjoy preserving the history of these motorcycles, so others can restore them correctly, and keep them alive and running.

The K Alphabet
Regular Production
K The original, displacing 750cc, produced in 1952 and 1953
KK A hotter version of the K, produced only in 1953
KH Long stroke 888cc model, produced from 1954 through 1956
KHK A hotter version of the KH, produced from 1954 through 1956
Competition
KR Competition K - Flat Track, various years
KRM Competition K - Scrambles and Trials, various years
KRTT Competition K - Road Racing, various years
KHR Competition KH - Flat Track, various years
KHRM Competition KH - Scrambles and Trials, various years
KHRTT Competition KH - Road Racing, various years
The XL Alphabet
Regular Production
XL Overhead valves, displacing 883cc, produced in 1957, 1958, 1959
XLH High Compression, more of a luxury model, 1958-1969
XLCH High-compression, sporting magneto model - produced from 1959 to 1969
Competition
XLC/H The 1958 XLC and XLCH were real competition models
XLR Competition - Flat Track, various years
XLRTT Competition - Road Racing, various years
Special Contracts
XLA U.S. Army model, 1957, and a few up into the early 1960s - 750cc
XLB Southeast Asia Police model, 1959-1967 ?
Production figures for the K and XL models can be found here
N.O.S. - New Old Stuff
2016 - July
Speedometers - updated illustration of rubber mounting Technical : Speedometers
More Stan Diener 1954 KH Photos Gallery : 1954 KH
More 1952, 1954, and 1957 Factory Photos
All Factory Photos now moved to the proper year sections
Technical : Colors
Literature : 1952, 1954 and 1957
1957 Spring Special Color Unearthed
Nugget Gold
Technical : Colors
Literature : Factory-To-Dealer
Transmission Covers - Jerry Raino Research Technical : Transmission Cover
2016 - June K-Model Finishes Compendium - Round 1 Finished Technical : Finishes
Finally! The 1967 Parts Catalog - now Available for download Literature : Spare Parts Catalogs
1954 KH Dairyland Insurance Poster Literature : 1954
1962 Parts Catalog Supplement - now Available for download Literature : Spare Parts Catalogs
1966 Parts Catalog Supplement - now Available for download Literature : Spare Parts Catalogs
1968 Parts Catalog Supplement - now Available for download Literature : Spare Parts Catalogs
1969 Parts Catalog Supplement - now Available for download Literature : Spare Parts Catalogs
1954 KH Brochure Literature : 1954
More 1953 KK Literature from Stan Diener Literature : 1953
Stan Diener's 1953 KK Gallery : 1953 KK
Kerry Brethorst's 1954 KHRTT Gallery : 1954 KHRTT
2016 - May Yes, they did exist!   A 1953 KK ad Literature : 1953
1959 Spring Special Color Unearthed
Hi-Fi Coral
Technical : Colors
Literature : Factory-To-Dealer
1954 Spring Special Colors Unearthed
“An ensemble of Ivory, Black and Chrome”
Technical : Colors
Literature : Factory-To-Dealer
Bill Coleman's Original 1953 KK Gallery : 1953 KK
Technical: Circuit Breakers (updated) Technical : Circuit Breakers
1959 Dealer Package (from Dr. Dick) Literature
Stan Diener's 1954 KH Gallery : 1954 KH
K Finishes - 70% done - 42 down, 18 to go Technical : Finishes : 1952-1956
2016 - April OSKRG-East - at Oley 2016 Gallery : Oley 2016
How To - Parkerize Parts Technical : How To : Parkerize
How To - Get A Title Technical : How To : Titles
2016 - March Roger Meinke's Factory-to-Dealer Docs Literature
Roger Meinke's 1959 XLCH Magazine Ads Literature
2016 - February Wheels and Tires Technical : Wheels and Tires
Finishes - Phase II Technical : Finishes
1952 K Factory Advertisement Literature
Revised: Shipping Date Guess-O-Meter Tech : Numbers : Guess-O-Meter
2016 - January Spare Parts Catalogs On-Line - 1961 Supplement Literature : Spare Parts Catalogs
Wiring Diagrams Technical : Wiring
Crankcase Tech Article Technical : Cranckcases (PDF)
Brian Kane's 1967 XLCH Gallery : 1967 XLCH
Spare Parts Catalogs On-Line - 1964 Supplement Literature : Spare Parts Catalogs
Spare Parts Catalogs On-Line - 1965 Full Catalog Literature : Spare Parts Catalogs
Spare Parts Catalogs On-Line - 1960 Supplement Literature : Spare Parts Catalogs
2015 - December Shipping Date Guess-O-Meter Tech : Numbers : Guess-O-Meter
Anonymous's 1954 KHK - The Last 1954 Made? Gallery : 1954 KHK
KHs Escort Haile Selassie in 1954 Literature : Eindhoven Police
Two More Enthusiasts Found Literature : The Enthusiast
Spare Parts Catalogs On-Line - 1953 Literature : Spare Parts Catalogs
2015 - November Three More ex-Mike Quinn KH-es Gallery
ex-Mike Quinn 1953 KRTT Gallery : 1953 KRTT
ex-Mike Quinn 1953 KRM Gallery : 1953 KRM
ex-Mike Quinn 1952 K Gallery : 1952 K
1953 Harley Brochure Literature : 1953 Harley Brochure
Oil Tanks Technical : Oil Tanks
More Paint Colors Found! Technical : Colors
Magneto Sportster's 1959 XLCH Gallery : 1959 XLCH
Magneto Sportster's 1966 XLCH Gallery : 1966 XLCH
Spare Parts Catalogs On-Line - 1963 Literature : Spare Parts Catalogs
2015 - October 1953 - Four More Colors Found Technical : Colors
Rob White's 1968 XLH Gallery : 1968 XLH
Spare Parts Catalogs On-Line - 1954, 1955, 1956, 1957, 1959 Literature : Spare Parts Catalogs
2015 - September The OSKRG Luncheon at Davenport 2015 Gallery : OSKRG
John Hewson's 1953 K Gallery : 1953 K
1953 KRM Barnster Gallery : 1953 KRM
Dennis Schoenfeldt's 1961 KR Gallery : 1961 KR
2015 - August Literature - 1968 Sportster Ad Literature
2015 - July Literature - 1959 XLCH - Hot Rod magazine Literature
Gallery - Mike Walker's 1956 KH Survivor/Barnster Gallery : 1956 KH
Literature - 1956 KHK, 1952 Popular Mechanics Literature
Technical - Battery and Fittings Technical : Battery
Gallery - Doug Feinsod's 1952 K Barnster Gallery : 1952 K
Gallery - Dave Swanson's 1956 KHK Gallery : 1956 KHK
Literature - Pohlman Prints Literature
2015 - June Gallery - Dave Carlton's 1968 XLCH Gallery : 1968 XLCH
The Production Figures Return! History : Production Figures
Added 1975 Parts Cover, updated 1972 Parts Cover Literature : Parts Catalogs
2015 - May Technical - Regulators - Added 2 Delco-Remy Docs and 2 Shop Dopes Technical : Regulators
2015 - February Literature - Parts Catalogs Updated Literature : Parts Catalogs
Technical - Frames Updated Technical Frames
Technical - Carburators - Updated Technical : Carbs
Technical - Added Colors Section Technical : Colors
2015 - January Literature - Enthusiast - added 5 covers Literature: Enthusiast
Gallery - Dave Carlton's 1961 XLCH Gallery: 1961 XLCH
Technical - added wiring diagrams to several models Technical : Generators
Gallery - Dave Carlton's 1967 XLCH Gallery: 1967 XLCH
2014 - November Technical - Updated DC Carburator Document Technical: Carbs
Gallery - More photos of Michael Broad's 1955 KH Gallery
Gallery - More photos of Model-H's 1958 XLH Gallery
Literature - Mike Broad's great 1955 KH Brochure Literature
Gallery - added Hans Postema's 1956 KH Gallery
Gallery - added Don Chasteen's Black 1957 XL (partial) Gallery
Gallery - added Don Chasteen's Blue 1957 XL (partial) Gallery
Technical - added Magnetos Technical: Magnetos
Technical - added Horns Technical: Horns
2014 - October Literature - added 1957 Cuts and Mats Book Literature
Literature - added Parts Cats, Service Mans, Enthusiasts Literature
2014 - September Technical - Wet Clutch Assembly Technical: Clutch
Gallery - OSKRG Luncheon at Davenport Gallery
Gallery - Gene Payne's 1961 XLR and 1970 XLR-900 Gallery
Gallery - Jack Raino's 1957 XL, Tom Auerback's 1969 XLCH Gallery
Gallery - Dave Carlton's 1966 XLCH and 1969 XLCH Gallery
2014 - August Gallery - Murph's 1953 K and 1962 XLCH Gallery
Technical: Numbers - K/KH - The Letter D Technical: Numbers
Gallery: Doc's 1959 XLCH Photos Gallery
2014 - July Gallery: 1954 KH Barnster Photos Gallery
Technical: Serial and Other Numbers Technical: Numbers
2014 - June Gallery: Michael Broad's 1955 KH Gallery
Gallery: Barnster® Photos Gallery
Gallery: Tom White's KRM Gallery
Technical: Regulator Info Technical: Regulators
2014 - May Gallery: Glenn Bator's Beautiful 1952 K Gallery
Story: Erik Hoopes and Joe Leonard Go Couch-Racing Competition
Photos of Ks and early XLs seen at the Oley Swap Meet Gallery
2014 - April Updated Frame Chart from Jerry Raino Technical