Harley Davidson® VIN Identification Guide

This list is unofficial and is not gospel, only what I have been able to cross in various manuals, web sites and dealerships. If you have more updated info on this data, please let me know.

Thanks!!

Year Groups

1903-1909 | 1910-1919 | 1920-1929 | 1930-1936 | 1937-1961 | 1962-1969 | 1970-1980 | 1981-2000 | 2001-2009 | 2010-Present

Model Info

1910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | 1917 | 1918 | 1919

1910

• Motor numbers 4200-7600
• Model 6 - 30ci F-Head single with 28" wheels, battery ignition.
• Model 6A - 30ci F-Head single with 28" wheels, magneto ignition.
• Model 6B - 30ci F-Head single with 26" wheels, battery ignition.
• Model 6C - 30ci F-Head single with 26" wheels, magneto ignition.
• Model 6E - Factory Stock Racer, 30ci F-head single

Production: 3,168

Model 6 - 2302 Model 6A - 334 Model 6B - 443 Model 6C - 88 Model 6E - 1

First Year
Belt idler mechanism
1-3/4in leather drive belts
H-D bar-and-shield logo with word "Trademark"

1911

• Motor numbers 7600-10000
• Model 7 - 30ci F-head single, 28" wheels, battery ignition
• Model 7A - 30ci F-head single, 28" wheels, magneto ignition
• Model 7B - 30ci F-head single, 26" wheels, battery ignition
• Model 7C - 30ci F-head single, 26" wheels, magneto ignition
• Model 7D - 50ci F-head v-twin, 28" wheels, magneto ignition

Production: 5,625 (detail figures not available)

Series 7 F-Head Singles

First Year
Vertical cooling fins on cylinder heads
Straight-section front downtube on frame
One-piece steel exhaust valve

Series 7 F-Head V-Twins

First Year
Mechanical inlet valves, cam-operated
Straight-section front downtube frame
Full-baffle with three 3/8" holes in each side under front cylinder and half-baffle under rear cylinder
60deg seats on both intake and exhaust valves
One-piece steel exhaust valve
Vertical cooling fins on cylinder head
Tensioning system for belt drive

1912

• Things got really complicated with both chain and belt drive being offered and a clutching mechanism designated by an "X"; all wheels were the 28-inch variety.



• Model 8 - 30ci F-head single, single-belt drive, battery ignition, 4.34 HP, motor numbers followed by AB, BA or B
• Model X8 - 30ci F-head single, single-belt drive, battery ignition, rear wheel clutch, 4.34 HP, motor numbers followed by AB, BA or B
• Model 8A - 30ci F-head single, single-belt drive, magneto ignition, 4.34 HP, motor numbers followed by AB, BA or B
• Model X8A - 30ci F-head single, single-belt drive, magneto ignition, rear wheel clutch, 4.34 HP, motor numbers followed by AB, BA or B
• Model 8D - 50ci F-head V-twin, single-belt drive, magneto ignition, 6.5 HP, motor numbers followed by D
• Model X8D - 50ci F-head V-twin single-belt drive, magneto ignition, rear wheel clutch, 6.5 HP, motor numbers followed by D
• Model X8E - 61ci F-head V-twin, chain final drive, magneto ignition, rear wheel clutch, 7 to 8 HP, motor numbers followed by E

Production: 3,852 (detail figures not available)

Series 8 F-Head Singles

First Year
New frame with a horizontal top frame rail sloping to the rear
Pedal cranks mounted on a hub having eccentric end pieces holding hub into frame
Troxel saddle suspension system with Tru-form padded Ful-Floteing saddle and spring-adjustable center post.
Front-fender rear section designed with a slight valance
Free-wheel cluth assembly in rear axle hub on models with "X" prefix; operated by handle on gas tank
Redesigned tanks
Oil tank under the seat

Series 8 F-Head V-Twins

First Year
New frame with a horizontal top frame rail sloping to the rear
Pedal cranks mounted on a hub having eccentric end pieces holding hub into frame
Troxel saddle suspension system with Tru-form padded Ful-Floteing saddle and spring-adjustable center post.
Front-fender rear section designed with a slight valance
Free-wheel cluth assembly in rear axle hub on models with "X" prefix; operated by handle on gas tank
Sprocket shaft ball race
Worm actuated clutch
Splined clutch hub
Tank-mounted hand-operated oil pump as main lubrication

Series X-8-E F-Head Big Twins

First Year
Engine: 61ci F-Head V-twin with mechanical inlet valve and 3-5/16x3-1/2in bore and stroke
Bosch magneto standard
Roller chain drive
Timed breather system using a slotted breather gear
Tank-mounted hand-operated oil pump as main lubrication
Connecting rods with roller-bearing big ends
Twist-grip compression release
Splined clutch hub
Ball-bearing mainshaft with self-aligning bearings on sprocket side
Vertical-radial pattern cooling fins on cylinder heads
Full-baffle with three 3/8" holes in each side under front cylinder and half-baffle under rear cylinder
Horizontal top frame rail sloping to the rear
Pedal cranks mounted on a hub having eccentric end pieces holding hub into frame
Front-fender rear section designed with a slight valance
Free-wheel cluth assembly


Only Year
Iron pistons

1913

• Model 9A - 35ci F-head single, belt drive, magneto ignition, motor numbers followed by C
• Model 9B - 35ci F-head single, chain drive, magneto ignition, 4.34 HP, motor numbers followed by D
• Model 9E - 61ci V-twin, chain drive, magneto ignition, 8.68 HP.
• Model 9F - 61ci F-head V-twin, chain drive
• Model 9G - Forecar Delivery Van - 61ci F-head V-twin, front mounted delivery box..

Production: 12,966

Model 9A - 1510 Model 9B - 4601 Model 9C - 11 Model 9E - 6732 Model 9F - 49 Model 9G - 63

Series 9 F-Head Singles

First Year
Engine: 35ci F-Head single (called the "5-35" because it put out 5hp from it's 35ci) with 3-5/16x4in bore and stroke
Mechanical inlet valves
Iron-alloy pistons
Pistons, rods, and flywheels balanced as a unit
Magneto ignition standard

Only Year
Eccentric piston rings
Fender width 3-3/4in
Bicycle-style wheel hubs and brakes
Exposed exhaust valve springs
Starting by pedaling or running alongside
Plain-bearing connecting rod big ends

Series 9 F-Head Big Twins

First Year
Model G commercial delivery van model offered
Pistons, rods, and flywheels balanced as individual unit
Iron-alloy pistons

1914

• Model 10A - 35ci F-head single-cylinder, belt drive, magneto ignition, 4.34 HP, motor numbers followed by CF
• Model 10B - 35ci F-fead single-cylinder, chain drive, 4.34 HP, motor numbers followed by DG or D, single speed
• Model 10C - 35ci F-head single-cylinder, chain drive, two speed rear hug, magneto ignition, 4.34 HP, motor numbers followed by DG or D
• Model 10E - 61ci V-twin, chain drive, magneto ignition, 8.68 HP
• Model 10F - 61ci V-twin, chain drive, two speed rear hub, magneto ignition, 8.68 HP
• Model 10G - Delivery Van - 61ci V-twin, two speed rear hub, magneto ignition, 8.68 HP

Production: 16,284

Model 10A - 316 Model 10B - 2034 Model 10C - 877 Model 10E - 5055 Model 10F - 7956 Model 10G - 171

Series 10 F-Head Singles

First Year
Step starter system
Taperd cylinder bores and straight pistons
Concentric piston rings
Carburetor choke
Padded chainguard
Clutch pedal
Brake pedal
H-D brand brakes, except on Model 10-A
H-D brand front and rear wheel hubs, except on Model 10-A
Tank-mounted hand-operated oil pump
Two-piece telescopic enclosure for exhaust valve
Roller bearings on connecting rod big ends
One-piece connecting rods, except on Model 10-A
Fender width 4-1/2in
Rectangular folding floorboards
Internal-expanding rear brake pads

Series 10 F-Head Big Twins

First Year
Step starter system
Nine lug crankcases - late year
Clutch pedal
Brake pedal
Padded chainguard
Fender width 4-1/2in
Rectangular folding floorboards
Concentric piston rings
Internal-expanding rear brake pads

H-D brand brakes
H-D brand front and rear wheel hubs
Two-piece telescopic enclosure for exhaust valve
Mechanically operated rotary relief valve
Taperd cylinder bores and straight pistons

Only Year
Two-speed rear hub transmission (used on Model 10-F)

1915

Main Models

• Model 11B - 35ci F-head single-cylinder, chain drive, magneto ignition, 4.34 HP, motor numbers followed by J, single speed
• Model 11C - 35ci F-head single-cylinder, two speed rear hub transmission, chain drive, magneto ignition, 4.34 HP, motor numbers followed by L
• Model 11E - 61ci F-head V-twin, single speed transmission, chain drive, magneto ignition, 8.68 HP
• Model 11F - 61ci F-head V-twin, Three speed transmission, chain drive, magneto ignition, 8.68 HP
• Model 11G - Delivery Van - 61ci F-head V-twin, three speed transmission, chain drive, magneto ignition, 8.68 HP
• Model 11H - 61ci F-head V-twin, single speed transmission, generato for electric lighting, chain drive, 8.68 HP
• Model 11J - 61ci F-head V-twin, three speed transmission, chain drive, generator for electric lighting, 8.68 HP
• Model 11K - Stripped Stock, 61ci F-head V-twin, three speed transmission

Specialty Models

• Model 11K4 - Track Racer, F-head single with magneto
• Model 11K5 - Roadster Racer, F-head single with magneto
• Model 11K12 - "Fast Motor" F-head V-twin with magneto
• Model 11K12H - "Fast Motor" F-head V-twin with electrical system.
• Model 11KT - Track Racer, F-head V-twin with magneto
• Model 11KR - Roadster Racer, F-head V-twin with magneto
• Model 11KRH - Roadster Racer, F-head V-twin with electrical system.
• Model KTH - Track Racer, F-head V-twin with electric

Sidecar and Chassis

• Model 11L - right-hand single-passenger sidecar
• Model L11L - left-hand single-passenger sidecar
• Model 11M - standard commercial sidecar

Production: 16,645

Model 11B - 670 Model 11C - 545 Model 11E - 1275 Model 11F - 9855 Model 11G - 98 Model 11H - 140 Model 11J - 1719 Model KR - 121 Model KT - 37 Model K4 - 30 Delivery Van - 3

Series 11 F-Head Singles

First Year
Ball bearings installed on left side of transmission (Model-11C)
45deg seats on intake and exhaust valves
Rear brakes made double-acting with leverage applied to both ends of expanding board
Motor-driven automatic oil pump with sight glass
Exhaust-lifter-pin screw for adjustments
Hand pump integrated with the oil tank and featuring a lock-down device
1in diameter flywheel crankpin
Two-piece construction pressed tubular steel handlebars
Grease cups on fork rocker plates
Tank-mounted hand-pump now emergency only

Series 11 F-Head Big Twins

First Year
Three-speed sliding-gear transmission with final and primary drive on the same side (Models 11-F and 11-J)
Vertical clutch arm in three-speed transmission (Models 11-F and 11-J)
Gear-clutch interlock in three-speed transmission (Models 11-F and 11-J)
All-steel muffler with foot-controlled cutout, larger expansion chamber, and tailpipe
Rear brakes made double-acting with leverage applied to both ends of expanding board
Shifter gate (Models 11-F and 11-J)
Oil pump and magneto-drive cover integrated
Motor-driven automatic oil pump with sight glass
Exhaust-lifter-pin screw for adjustments
Tie-boss added to the forked connecting rods
45deg seats on intake and exhaust valves
Connecting rod wrist pin bushing machined with a spiral groove and slotted at the top
Crankcase breather pipe designed at top of valve-action housing
Hand pump integrated with the oil tank
Two-unit Remy Model 15 magneto-generator for electric light system (Models 11-H and 11-J)
Electrical system with headlight, removable taillight, horn and ignition (Models 11-H and 11-J)
Oil deflector designed into the left side of three-speed transmission (Models 11-F and 11-J)
Two-piece construction pressed tubular steel handlebars
Oil tank a part of the gas tank assembly
Hand pump lock-down mechanism
1in diameter crankpin
Four-row roller bearing, two rows on each connecting-rod big end
H-D brand roller bearings
Roller bearing width 1-3/4in-wide
Transmission mainshaft bushing
Grease cups on fork rocker plates

Only Year
Transmission countershaft supported by phosphor bronze bushings on three-speed models
Remy Model 15 magneto-generator with vacuum-operated battery cutout (Models 11-H and 11-J)

1916

• The year designation was changed from year of production to calendar year, so it was not the 12-B but 16-B.

Main Models

• Model 16B - 35ci F-head single, chain drive, magneto ignition, 4.34 HP, motor number followed by L, single speed
• Model 16C - 35ci F-head single, chain drive, three speed transmission, magneto ignition, 4.34 HP, motor number followed by L
• Model 16E - 61ci F-head V-twin, chain drive, single speed transmission, magneto ignition, 6.5 HP
• Model 16F - Stock Competition, 61ci V-twin, chain drive, three speed transmission, magneto ignition, electrical system, 6.5 HP
• Model 16J - 61ci F-head V-twin, chain drive, three speed transmission, generator/electrical system, 7 to 8 HP
• Model 16S - Stripped Stock Racer, 35ci F-head single
• Model 16R - Roadster Racer, 61ci F-head V-twin
• Model 16T - Track Racer, 61ci F-head V-twin

Sidecars and Chassis

• Model 16LC - single-passenger sidecar chassis, right-hand
• Model 16XT - double-bar chassis with suit box and motorcycle
• Model 16L - right-hand single passenger sidecar
• Model 16LCK - single passenger sidecar, left hand
• Model 16M - standard commercial sidecar
• Model 16RFD - commercial sidecar with rural free delivery box.
• Model 16P - commercial sidecar with double-bar chassis and closed box
• Model 16U - commercial sidecar with double bar chassis and open box
• Model 16V - commercial sidecar with double-bar chassis and double covered box
• Model 16GC - gun car
• Model 16AC - ammunition car
• Model 16SC - sidecar chassis and stretcher, complete

Production: 17,439

Model 16B - 292 Model 16C - 862 Model 16E - 252 Model 16F - 9496 Model 16J - 5898 Model 16R - 82 Model 16S - 12 Model 16T - 23 Delivery Van - 7

Series B and C Singles

First Year
Single-pedal, rear stroke starter on Model C (Model B retainied the bicycle-style forward-sroke starter)
Tanks with rounded edges
Wider front forks
Fender width of 5-1/4in
Stronger wheel rims
Improved front hub
Filler caps 1-1/2in diameter
Steering head bearing receives larger head cone and two more balls in bearing
Revised model identification system: engine number lists actual year of model as prefix
"Standardization policy": same frame, footboards, and brake rod used on all models
Small working parts heat-treated
22-pint tank capacity
Dual function left tank - both gas and oil compartments
Forward front fender brace
45deg seats on intake and exhaust valves
Shorter clutch hand lever
New drive gear for magneto or generator

Series E, F, and J Big Twins

First Year
Single-pedal, rear stroke starter
Tanks with rounded edges
Wider front forks
Fender width of 5-1/4in
Stronger wheel rims
Improved front hub
Filler caps 1-1/2in diameter
Steering head bearing receives larger head cone and two more balls in bearing
Revised model identification system: engine number lists actual year of model as prefix
"Standardization policy": same frame, footboards, and brake rod used on all models
Small working parts heat-treated
22-pint tank capacity
Dual function left tank - both gas and oil compartments
Forward front fender brace
45deg seats on intake and exhaust valves
Shorter clutch hand lever
New drive gear for magneto or generator
Model 250 Remy generator with a mechanical switch
Roller bearings supporting transmission countershaft (three-speed models)
Self-aligning clutch thrust bearing outer ball race and housing (three-speed models)

Specialty Notes

First Year
Four-valve overhead-valve (OHV) racing singles with four valves
Eight-valve OHV racing twins with four valves per cylinder and four cam lobes

Only Year
Experimental Model 16-GC sidecar gun carriage for military use; the sidecar served as a platform for a Colt machine gun.

1917

Main Models

• Model 17B - 35ci F-head single, chain drive, magneto ignition, 4.34 HP, motor number preceded by 17S, single speed
• Model 17C - 35ci F-head single, chain drive, three speed transmission, magneto ignition, 4.34 HP, 35 c.i.motor number followed by L
• Model 17E - 61ci F-head V-twin, chain drive, single speed transmission, magneto ignition, 8.68 HP
• Model 17F - 61ci F-head V-twin, chain drive, three speed transmission, magneto ignition, 8.68 HP
• Model 17J - 61ci F-head V-twin, chain drive, three speed transmission, generator/electrical system, 7 to 8 HP, 60.34 c.i.
• Model 17S - Stripped Stock Racer, 35ci F-head single
• Model 17R - Roadster Racer, 61ci F-head V-twin
• Model 17T - Stripped Stock Raced, 61ci F-head V-twin

Sidecars and Chassis

• Model 17L - right-hand single passenger sidecar
• Model L17L - left-hand single-passenger sidecar
• Model 17LC - right hand single passenger sidecar chassis
• Model 17LCL - left-hand single passenger sidecar chassis
• Model 17M - standard commercial sidecar
• Model 17N - commercial sidecar (rural free delivery)
• Model 17P - commercial sidecar with double-bar chassis and closed box
• Model 17U - commercial sidecar with double-bar chassis and open box
• Model 17V - commercial sidecar with double-bar chassis and double covered box.

Production: 19,763

Model 17B - 124 Model 17C - 605 Model 17E - 68 Model 17F - 8527 Model 17J - 9180 Model 17R - 12 Model 17S - 5 Model 17T - 1

Series B and C Singles

First Year
Olive painted crankcases
Coach Green broad stripe down middle of front fender

Only Year
Dixie brand magneto

Series E, F, and J Big Twins

First Year
Olive painted crankcases
Coach Green broad stripe down middle of front fender
Four-lobe cam
Revised valve timing for more valve overlap
Valve roller arms
Pushrod spring covers
Pistons grooved above the lower edge of the piston skirt
Holed pistons. Holes drilled around the skirt
Dixie-brand magnetos
Revised right and left crankcases
Revised inlet housing, inlet housing cap, inlet valve springs, inlet manifold, and inlet valves
Inlet valve pushrod springs enclosed
Crankpin double-row roller bearings
Revised transmission mainshaft roller bearing
Revised clutch hub shell ring and clutch key ring
Revised read mudguard

Specialty Notes

First Year
Engine with "Fast Motors" classification. These are standard motors that are precision fit and set up with looser clearances; motor numbers 500 to 999
"Fast Motors" receive new front and rear cylinders, front and rear inlet valve housings, inlet-valve caps, inlet-housing-cap clamp nuts, inlet valves inlet-valve springs, inlet pushrods, pushrod springs, exhaust valves (each with a key), and right and left crankcases

1918

Main Models

• Model 18B - 35ci F-head single, chain drive, high tension magneto ignition, 4.34 HP, motor number preceded by 18S, single speed
• Model 18C - Solo, 35ci F-head single, chain drive, three speed transmission, high tension magneto ignition, 4.34 HP, motor number preceded by 18S
• Model 18E - 61ci F-head V-twin, chain drive, high tension magneto ignition, 8.68 HP, motor number preceded by 18T, single speed transmission
• Model 18F - Solo, 61ci F-head V-twin, chain drive, high tension magneto ignition, 8.68 HP, number preceded by 18T, three speed transmission
• Model 18J - Solo, 61ci F-head V-twin, chain drive, electrical system, magneto ignition, 8.68 HP, number preceded by L18T, three speed transmission
• Model 18R - Roadster Racer, 61ci f-head V-twin, three speed transmission
• Model 18FUS - Presto Lite Equipped Government Use Only, 61ci F-head V-twin, 3 speed transmission

Specialty Models

• Model 18FA - "A" motor F-head V-twin, 3 speed transmission, magneto ignition
• Model 18JA - "A" motor F-head V-twin, 3 speed transmission, electrical system
• Model 18FB - "B" motor F-head V-twin, 3 speed, magneto ignition
• Model 18JB - "B" motor F-head V-twin , 3 speed, electrical system
• Model 18FCA - "500 CA" motor F-head V-twin, 3 speed, magneto, 3-1/2" stroke, aluminum pistons
• Model 18FF - "500" motor F-head V-twin, 3 speed, magneto
• Model 18JF - "500" motor F-head V-twin, 3 speed, electrical system
• Model 18FFA - "500 A" motor F-head V-twin, 3 speed, 3-1/2" stroke, aluminum pistons, magneto
• Model 18FCAB - "500 CAB" motor F-head V-twin, 4" stroke, aluminum pistons, magneto

Sidecars and Chassis

• Model 18L - right-hand single passenger sidecar
• Model L18L - left-hand single-passenger sidecar
• Model 18LC - right hand single passenger sidecar chassis
• Model 18LCL - left-hand single passenger sidecar chassis
• Model 18M - standard commercial sidecar
• Model 18N - commercial sidecar, rural free delivery
• Model 18Q - two-passenger sidecar chassis, 56in tread
• Model 18QA - standard closed commercial van, 56in tread chassis
• Model 18QB - standard open commercial van, 56in tread chassis
• Model 18QD - two compartment Parcel Car, 56in tread chassis
• Model 18QL - right hand two-passenger sidecar
• Model 18QC3 - three-stake platform Parcel Car, 56in tread seat chassis
• Model 18QC4 - four-stake platform Parcel Car, 56in tread seat chassis

Production: 19,359

Model 18B - 19 Model 18C - 251 Model 18F - 11,764 Model 18E - 5 Model 18J - 6571 Model 18R - 3 Model 18FUS - 8095

Series B and C Singles

First Year
Oil-hole cover
Berling-brand magneto
Revised front chain guard
Relief pipe clamp and screw
Series B and C single discontinued at the end of the model year

Series E, F, and J Big Twins

First Year
Model 235 Remy generator (early year)
Oil-hole cover
Relief pipe clamp and screw
Revised front chain guard
Revised clutch bearings oiled by rider, through actuating plate
Revised upper and lower exhaust-valve covers
Revised magneto gear
Revised generator drive case, intermediate gear, drive gear, gear stud, stud collar, and control rod
Revised hand-brake handle
Revised clutch-hub shell and sprocket
Revised foot clutch-lever rod
Revised clutch driving hubs and nuts

1919

Main Models

• Model 19F - 61ci F-head V- twin, chain drive, magneto ignition, 8.68 HP, number preceded by 19T or 19A, three speed
• Model 19WF - Sport, 35.64ci front to back horizontally opposed twin, three speed, magneto ignition
• Model 19FS - Sidecar Twin, 61ci F-head V-twin, "sidecar motor", three speed transmission
• Model 19J - Solo, 61ci F-head V-twin, chain drive, magneto ignition, 8.68 HP, number preceded by L19T or L19A, three speed
• Model 19JS - Sidecar Twin, 61ci F-head V-twin, 3 speed transmission

Specialty Models

• Model 19FCA - "500 CA" motor F-head V-twin, 3 speed, 3-1/2" stroke, aluminum pistons
• Model 19FF - "500"motor F-head V-twin, 3 speed, magneto ignition
• Model 19FB - "B" motor F-head V-twin, 3 speed, magneto ignition
• Model 19FFA - "500" motor F-head V-twin, 3 speed, 3-1/2" stroke, aluminum pistons
• Model 19FCAB - "500 CAB" motor F-head V-twin, 3 speed, 4 in stroke, aluminum pistons, magneto ignition
• Model 19JA - "A" motor F-head V-twin, 3 speed, electrical system
• Model 19JB - "B" motor F-head V-twin, 3 speed, electrical system
• Model 19JF - "500" motor F-head V-twin, 3 speed, electrical system
• Model 19FUS - Presto Lite Equipped Government Use only, 61ci F-head V-twin, 3 speed

Sidecars and Chassis

• Model 19L - right-hand single passenger sidecar
• Model 19LUS - right-hand single passenger sidecar for US Government
• Model L19L - left-hand single-passenger sidecar
• Model 19LC - right hand single passenger sidecar chassis
• Model L19LC - left-hand single passenger sidecar chassis
• Model 19M - standard commercial sidecar
• Model 19Q - two-passenger sidecar chassis, 56in tread
• Model 19QA - standard closed commercial van, 56in tread chassis
• Model 19QB - standard open commercial van, 56in tread chassis
• Model 19QD - two compartment Parcel Car, 56in tread chassis
• Model 19QL - right hand two-passenger sidecar
• Model 19QC3 - three-stake platform Parcel Car, 56in tread seat chassis
• Model 19QC4 - four-stake platform Parcel Car, 56in tread seat chassis

Production: 24,292

Model 19F - 5064 Model 19J - 9941 Model 19W - 753 Model 19FUS - 7521

Series F and J Big Twins

First Year
Engine-casting clamp plates
Handlebars 2.5in wider and painted Olive Drab
Clutch push rod
Cam-actuated clutch (late year)
Clutch-actuating-cam guard (late year)
Clutch connecting link and pin (late year)

Series W Sport Twins

First Year
The Sport Twin is an all new model introduced in mid-1919
Engine: 35.64ci (584.03cc) horizontally opposed flathead twin with 2-3/4x3in bore and stroke and output of 6hp
Nondetachable cylinder heads
Compression ratio 3.75:1
Unit construction of both engine and transmission
Crankshaft turns on roller bearings
Roller bearings on connecting rod big ends
3/8in rollers for big end crankshaft
Single camshaft directly transmits cam motion to both intake and exhaust valves
Inlet and exhaust manifold cast together
Engine prefix M for magneto model
Screw-in valve guides
Oil plunger pump
Crankcase unpainted
Pressed-steel cover over flywheel
Three-speed sliding-gear transmission
Keystone frame; endingis the main stress bearer of frame
Training-link forks
Front fender fully sprung
Totally enclosed chain drive
Flat-topped bicycle saddle
Primary drive transmits through three helical gears to the wet clutch
Two-piece-construction pressed-tubular-steel handlebars

Only Year
Starter crank cap screw
2-5/8in front motor-clamp plate pads

Specialty Notes

First Year
Two-Cam F-head racers; last year 1929
Two-Cam eight-valve racer; last year 1929
Two cam gears, each with two lobes (Two-Cam racer); last year 1929
Two cam valve-lifting mechanism (Two-Cam racer); last year 1929
Pivoted lifter arms (Two-Cam racer) last year 1923
Lifter blocks cast in (Two-Cam racer); last year 1923

Only Year
Banjo timing-case cover
Special-order J-type single-cylinder engines