1926-1934 Harley-Davidson Model BA Peashooter: 21-Cubic-Inch OHV Factory Racing Single
The Harley-Davidson Model BA Peashooter belongs to one of the most interesting side roads in Milwaukee history: the lightweight single-cylinder programme of the late 1920s and early 1930s. It was not a Strap Tank pioneer, not a big J or JD twin, and not a later Depression-era 45. It was a compact, fast-revving, 21-cubic-inch single tied directly to Harley-Davidson's factory racing effort and to the American fascination with lightweight dirt-track speed.
The Peashooter name is a collector and enthusiast term applied most strongly to Harley-Davidson's small overhead-valve singles, especially the factory racing machines whose sharp exhaust note gave the nickname its point. The Model BA sits in that world: a lean, mechanically exposed Harley single from the period when Class A racing, cinder tracks, short ovals and export-market lightweight demand all mattered to the Motor Company.
Best Known For: the Model BA Peashooter is best remembered as Harley-Davidson's 21-cubic-inch overhead-valve single associated with the factory racing single era, a machine prized today for its compact architecture, racing connection and relative rarity beside the company's better-known V-twins.
Quick Facts
The table below gives the essential reference points without forcing uncertain period figures into false precision. With Peashooters, exact equipment can vary by year, market, road or racing specification, and later restoration choices.
| Category | Detail |
|---|---|
| Production years commonly associated | 1926-1934 |
| Manufacturer | Harley-Davidson Motor Company, Milwaukee, Wisconsin |
| Model family | Harley-Davidson Peashooter single-cylinder family |
| Model focus | Model BA Peashooter |
| Engine type | Air-cooled four-stroke single-cylinder overhead-valve engine |
| Displacement | Approximately 21 cubic inches, commonly described as 350 cc class |
| Transmission | 3-speed hand-shift gearbox |
| Final drive | Chain |
| Frame / chassis | Tubular steel motorcycle frame, rigid rear |
| Suspension layout | Harley-Davidson spring fork front, rigid rear frame |
| Brakes | Drum braking equipment; front brake fitment and details should be checked against year and specification |
| Primary use | Sporting road use, lightweight competition influence, export and economy-class single-cylinder market |
| Collector significance | A scarce Harley-Davidson single with direct Peashooter racing-era identity |
The important point is not merely that the BA was small. It was small in a very un-Harley-Davidson way for many modern collectors: upright, narrow, mechanically exposed, and connected to a racing category that rewarded lightness and engine speed rather than V-twin torque.
Why the Model BA Peashooter Matters
The Model BA matters because it contradicts the simple version of Harley-Davidson history. Milwaukee was not only building large V-twins for touring riders, police departments, sidecar men and commercial operators. In the 1920s it also fought for relevance in the lightweight single-cylinder class, where racing publicity and practical transport overlapped.
The Peashooter family was Harley-Davidson's answer to a rulebook and a marketplace. American competition had strong demand for small-displacement machines, while export markets often favored lighter, cheaper motorcycles than the big American twins. The BA and its close relatives show Harley-Davidson engineering in a different register: compact, purposeful, and willing to use overhead-valve breathing at a time when many road machines still relied on side-valve simplicity.
For collectors, the BA is desirable because it is not just another old Harley with patina. Correct examples require knowledge. Racing parts, road equipment, later reproduction pieces, mixed-year assemblies and optimistic restorations all appear in the market, and the difference between a properly identified BA-family Peashooter and a loosely assembled “board track” special can be substantial.
Historical Context and Development Background
By the mid-1920s Harley-Davidson had emerged from the first great age of American motorcycle expansion. The company had military experience from the First World War, a strong V-twin reputation, and a substantial dealer network. But the American motorcycle market was tightening, and the automobile was steadily taking over basic transportation duties.
Racing remained a public proving ground. The old board-track era had already acquired a dangerous glamour, but dirt-track and Class A racing gave manufacturers a more sustainable arena in which to advertise speed, durability and technical competence. Harley-Davidson's factory race department, with men such as Joe Petrali becoming central to the public story, used small singles to contest lightweight categories where acceleration, gearing and handling mattered as much as brute displacement.
The Peashooter nickname came from sound and scale. A 21-cubic-inch single running hard through a short pipe did not have the deep pulse of a big twin; it cracked, barked and snapped. The name stuck because it captured the character of the machine and because period racing spectators remembered sounds as vividly as silhouettes.
Competitively, the BA-era Harley singles lived in a landscape that included Indian, Excelsior and a wide range of European single-cylinder thinking. In engineering terms, the motorcycle world was not yet standardized. Riders and mechanics still accepted hand controls, total-loss or metered oiling practices, exposed valve gear, rigid frames and frequent adjustment as normal parts of ownership.
Engine and Drivetrain
The Model BA Peashooter is most significant for its 21-cubic-inch overhead-valve single-cylinder engine. The overhead-valve layout was not decorative; it was central to the Peashooter idea. Better breathing gave the little motor the ability to rev and produce useful performance from a small displacement, which was exactly what the lightweight racing and sporting market demanded.
Period and surviving machines commonly show the exposed, upright mechanical character that makes these singles visually different from Harley-Davidson's larger flathead twins. Pushrod and rocker architecture, a compact crankcase, external oil and fuel fittings, and the absence of unnecessary bodywork give the BA its particular appeal. A restored example should not look like a miniature big twin; it should look like a purposeful single from a racing-aware factory.
Fuel was handled by period carburetion, with Schebler units commonly associated with Harley-Davidson machines of the era. Ignition equipment can vary by specification, year and intended use, with magneto ignition especially relevant to sporting and racing configurations. Road machines with lighting equipment require careful inspection because later electrical conversions and mixed parts are common on old singles that remained in use long after factory support ended.
The clutch, primary drive and gearbox were period Harley practice scaled to the single-cylinder machine. The gearbox was a three-speed hand-shift unit, and riders used the motorcycle through the familiar early-Harley choreography of hand lever, foot clutch and advance/retard discipline rather than modern twist-and-go simplicity.
Engine and Drivetrain Specifications
This table is intentionally limited to core mechanical points that are consistently associated with the BA Peashooter type. Horsepower, torque and top-speed figures are not included because period and later sources do not present them with the consistency required for a serious reference table.
| Item | Specification |
|---|---|
| Engine configuration | Single-cylinder, four-stroke |
| Cooling | Air-cooled |
| Valve gear | Overhead valve |
| Displacement class | 21 cubic inches / approximately 350 cc |
| Carburetion | Period single carburetor; Schebler equipment is commonly associated with Harley-Davidson machines of this era |
| Ignition | Magneto or battery/lighting-associated equipment depending on specification and year |
| Transmission | 3-speed hand-shift gearbox |
| Final drive | Chain |
For restoration purposes, the absence of a horsepower figure in this article is deliberate. Peashooter engines have been raced, rebuilt, replicated and modified for nearly a century; quoting a single output number without tying it to a factory specification, fuel, camshaft, carburetor and state of tune would mislead more than it would inform.
Chassis, Suspension and Braking
The BA Peashooter's chassis is part of its identity. It used a rigid rear frame and a Harley-Davidson spring fork at the front, a layout that placed nearly all compliance in the fork, saddle and tires. That was normal for the period, but on a lightweight single the result was a motorcycle that felt far more immediate than the large twins.
Compared with a big Harley twin, the BA's narrow engine and lighter mass changed the way the motorcycle occupied the road. It did not have the planted, flywheel-heavy gait of a touring V-twin. It was a quicker, more nervous machine, closer in spirit to the stripped singles used on American dirt ovals and short competition courses.
Braking equipment deserves care in identification. Drum brakes were the period solution, but exact front-brake fitment, hub type and linkage details must be checked against year, factory parts references and surviving original examples. Many early motorcycles acquired later wheels, hubs and brake assemblies because they were ridden hard and repaired pragmatically.
Chassis and Equipment Reference
The following table is useful when looking at a BA-family Peashooter in person. It separates the broad architecture from the year-specific details that need further documentary confirmation.
| Area | Factory-Era Configuration |
|---|---|
| Frame | Tubular steel motorcycle frame, rigid rear |
| Front suspension | Harley-Davidson spring fork |
| Rear suspension | None; rigid frame |
| Brakes | Drum braking equipment; exact arrangement varies by year and specification |
| Controls | Period hand-shift and foot-clutch control layout |
| Body equipment | Road equipment may include fenders, tanks, lighting and stands appropriate to year and market; racing configurations were more stripped |
The BA's stance is best understood visually: a high, narrow single in a simple frame, with the engine exposed rather than hidden. The tank and fenders carry the visual language of late-1920s Harley-Davidson, but the motorcycle's proportions are closer to a competition tool than a touring mount.
Riding Experience and Mechanical Character
Starting a BA Peashooter is a small ritual rather than a button press. The rider manages fuel, ignition, compression and throttle by feel, then brings the single through with a deliberate kick. A healthy engine should speak sharply rather than lazily, with a crisp exhaust beat very different from the rolling cadence of a big flathead twin.
Once running, the Peashooter gives its age away through exposed mechanical sound. Valve gear, primary drive, chain, magneto and carburetor all contribute to the experience. These motorcycles were built in a period when mechanical noise was not isolated from the rider; it was information.
The hand-shift, foot-clutch layout demands coordination, especially at low speeds. The clutch is not something to be treated like a modern cable-operated unit, and the gearbox rewards a patient hand. The engine's useful character comes from momentum and gearing rather than modern torque spread, and a rider has to keep it alive rather than expect it to pull from nothing.
On roads of its era the BA would have felt quick, lean and somewhat raw. Rigid rear suspension, narrow tires and period brakes place a hard limit on modern expectations. The motorcycle was not designed for high-speed freeway stability or repeated panic stops; it was designed for dirt roads, town traffic, short-distance sporting use and the mechanical realities of the late 1920s.
Identification and Originality
Correctly identifying a Model BA Peashooter requires more than seeing a small Harley single and hearing the nickname. Collectors should look at the engine type, model-code documentation, frame and engine number consistency, gearbox, carburetion, ignition equipment, tanks, fenders, hubs, fork and control layout. Many surviving examples have been restored from incomplete machines, and some have been built to resemble factory racers or board-track machines using a mixture of original and reproduction parts.
The term “Strap Tank” should be kept out of the BA's identity except as a contrast. Strap Tank refers to Harley-Davidson's earliest pioneer singles, particularly the very early machines with fuel and oil tanks attached to the frame by metal straps. The BA Peashooter is a much later motorcycle from the formed-tank, chain-drive, three-speed era. Calling a BA a Strap Tank is historically wrong and usually signals loose cataloguing rather than expertise.
Important visual cues include the compact OHV single, narrow period frame, Harley spring fork, hand-shift control arrangement, correct tank and fender style, and the presence or absence of road equipment appropriate to the claimed specification. Racing-style machines should be treated with particular care. Stripped fenders, short exhausts, racing number plates and absence of lights may be historically plausible for competition use, but they are also easy to imitate.
Paint and badging deserve the same scrutiny as engine parts. Period Harley-Davidson finishes, striping and tank markings changed over time, and restored examples are often finished to a pleasing general impression rather than a year-correct specification. A concours-level BA restoration should be backed by factory literature, period photographs, parts books, marque-club knowledge and provenance rather than modern internet repetition.
Model Code and Variant Breakdown
Harley-Davidson single-cylinder model nomenclature from this period must be handled carefully because road models, competition machines, export deliveries and later collector terminology are often conflated. The following table gives the commonly discussed Peashooter-related categories most relevant to BA research rather than attempting to decode every stamping or market suffix.
| Model / Code | Years | Engine / Displacement | Purpose | Key Difference |
|---|---|---|---|---|
| Model BA Peashooter | 1926-1934 association | 21 cu in / approximately 350 cc OHV single | Sporting road use and racing-influenced lightweight single-cylinder market | The focus model; closely tied to the Peashooter identity and lightweight Harley single programme |
| Peashooter factory racing singles | Late 1920s and early 1930s | 21 cu in OHV single in competition tune | Class racing, dirt track, short-course competition | Stripped equipment, racing tune and competition specification rather than road trim |
| Related Harley-Davidson lightweight singles | Late 1920s-early 1930s | Small-displacement single-cylinder engines, including 21 cu in class machines | Economy transport, export sales, sporting road use | Not every Harley single of the period is correctly described as a BA Peashooter; engine type and documentation matter |
| Large Harley-Davidson V-twin road models | Same general era | Larger V-twin engines | Touring, sidecar, police, commercial and general road use | Different mechanical character, market role and collector category from the BA single |
The practical lesson is simple: buy the documentation and the parts, not the nickname. “Peashooter” is useful language, but it is not a substitute for proper model identification.
Performance and Dimensional Specifications
Reliable period performance figures for the Model BA Peashooter are not consistently documented in a way that allows a single authoritative specification for horsepower, top speed, weight or acceleration. Racing singles, road-equipped machines and restored examples can differ substantially in gearing, carburetion, exhaust, ignition and internal specification.
What can be said with confidence is that the BA belonged to the 21-cubic-inch, approximately 350 cc class and used overhead-valve breathing to achieve a level of performance that made sense in lightweight competition and sporting road use. Its historical importance lies less in a quoted speed figure and more in how Harley-Davidson applied competition thinking to a small single-cylinder motorcycle.
Compared With Related Harley-Davidson Models
Model BA Peashooter vs. Early Harley-Davidson Strap Tank Singles
The comparison appears often because both are Harley-Davidson singles, but mechanically they are from different worlds. Strap Tank Harleys belong to the company's pioneer period, with early frame, tank and engine practice. The BA Peashooter is a later, more developed 1920s motorcycle with chain drive, a multi-speed gearbox and a racing-influenced overhead-valve engine identity.
Model BA Peashooter vs. Big Harley-Davidson V-Twins
Against a J, JD or later flathead twin, the BA is narrower, lighter and less torque-rich. The V-twins were the backbone of Harley-Davidson's road, police, touring and commercial image. The BA was a specialist lightweight, valuable today precisely because it sits outside the dominant big-twin storyline.
Model BA Peashooter vs. Factory Racing Peashooters
The closest confusion is between road-equipped BA-family machines and pure racing Peashooters. A true competition machine should show evidence beyond stripped road equipment. Racing provenance, correct engine specification, period photographs, factory or dealer history and long-term ownership records are crucial because racing-style parts can be reproduced or assembled later.
Model BA Peashooter vs. Other Late-1920s American Singles
Indian, Excelsior and European makers all understood the value of small singles, and the Harley BA must be read in that competitive context. Its appeal is not simply that it is a single; it is that it is a Harley-Davidson single with direct proximity to factory racing and the 21-cubic-inch class that shaped American lightweight competition.
Restoration and Ownership Notes
Restoring a BA Peashooter is a specialist job. Parts availability is uneven: some cycle parts and hardware can be found through veteran Harley-Davidson specialists, while correct engine, valve gear, magneto, carburetor and racing-specific components require patience and real network knowledge. Reproduction parts exist for some needs, but quality and accuracy vary.
The engine should be approached as a period racing-influenced single, not as a farm-engine simpleton. Crankshaft condition, main bearings, connecting rod, valve gear, cam and follower wear, oiling passages and magneto performance all matter. A beautifully painted motorcycle with a tired bottom end can become expensive quickly.
Frame and engine number integrity are major value points. Because many Peashooters have been raced, stripped, crashed, rebuilt or converted, collectors should be wary of mismatched assemblies presented with confident but unsupported stories. Proper invoices, old photographs, registration records, club dating letters and documented restoration history all add weight.
Originality is especially difficult because the most attractive visual specification is often the racing one. Short pipes, minimal fenders and competition number plates make a BA look sensational, but the market distinguishes between a documented racer, a period-modified sporting machine and a modern aesthetic build. The closer the asking price gets to serious collector territory, the more the evidence must carry the motorcycle.
Buyer and Restoration Inspection Points
A BA inspection should be slow and methodical. Do not let the Peashooter nickname, a racing paint job or the novelty of a small Harley single distract from the fundamentals.
| Area | What to Check | Why It Matters |
|---|---|---|
| Model identity | Confirm the claimed BA identity through numbers, paperwork, period references and expert marque review | Peashooter terminology is often used loosely, and misidentified singles are common in the collector market |
| Engine architecture | Inspect OHV components, pushrods, rockers, cases and cylinder/head configuration | The overhead-valve single is central to BA Peashooter value and identity |
| Crankshaft and bottom end | Check for bearing wear, end float, oiling condition and evidence of old racing stress | Small racing-influenced singles can hide expensive mechanical fatigue under fresh paint |
| Magneto and ignition | Verify correct equipment for the claimed specification and test spark quality hot and cold | Weak ignition makes these machines difficult to start and can mask carburetion or compression problems |
| Carburetor | Check type, wear, correct fitment and linkage condition | Incorrect carburetion can change starting, throttle response and historical accuracy |
| Frame and fork | Look for cracks, brazed or welded repairs, alignment issues and incorrect fork assemblies | Lightweight frames and spring forks often suffered from racing use, road abuse and decades of repairs |
| Wheels and brakes | Confirm hubs, rims, brake plates and linkage against year-correct references | Later wheel and brake swaps are practical but can reduce originality and value |
| Tanks and fenders | Inspect shape, mounting, seams, repairs, striping and badge treatment | Cycle-part correctness is a major visual and financial component of Peashooter authenticity |
| Racing claims | Ask for period photographs, ownership history, competition records or long-term provenance | A stripped road bike is not automatically a factory racer |
| Reproduction parts | Identify replica tanks, guards, exhausts, controls, castings and hardware | Good reproduction parts may make a motorcycle usable, but undisclosed reproduction content affects valuation |
A serious buyer should involve a Harley-Davidson single specialist before purchase, not after. The price of expert inspection is small compared with the cost of correcting a wrongly identified or cosmetically restored Peashooter.
Collector and Market Relevance
The Model BA Peashooter occupies a distinct niche in the Harley-Davidson collector world. It is not bought for the same reasons as a Knucklehead, Panhead, JD or early Strap Tank. It appeals to collectors who understand American racing, lightweight-class engineering and the unusual nature of a small OHV Harley-Davidson single.
Rarity is part of the appeal, but originality and provenance are more important than rarity alone. A documented BA with correct engine, frame, tanks, fork, carburetion, ignition and period equipment will always command more serious attention than an attractive but loosely assembled Peashooter-style special. Racing provenance, when real and documented, adds a different level of significance.
Auction interest tends to favor machines with visual drama, but knowledgeable collectors look past polish. They value correct numbers, original castings, documented ownership chains, factory or dealer evidence, and restoration work performed by recognized specialists. In this segment, an honest older restoration with good evidence may be preferable to a newly painted motorcycle with uncertain bones.
Cultural Relevance
The Peashooter belongs to the period when racing still sold motorcycles directly. Spectators at local tracks could hear and see the difference between a big twin and a hard-run single, and manufacturers used those impressions to create identity. Harley-Davidson's small racing singles helped keep the company visible in competition categories that did not suit its large road-going twins.
The BA also has a place in custom and display culture, though that cuts two ways. Its narrow stance, exposed engine and stripped racing look make it attractive to builders and museums. At the same time, that visual appeal has encouraged non-original “board track” interpretations that can blur the historical record if not clearly described.
For marque clubs and veteran motorcycle events, a correct BA Peashooter is a welcome sight because it widens the public understanding of Harley-Davidson. It reminds people that Milwaukee's history includes light singles, racing experiment, export practicality and engineering diversity—not only heavyweight V-twins.
FAQs
What years was the Harley-Davidson Model BA Peashooter produced?
The Model BA Peashooter is commonly associated with the 1926-1934 Harley-Davidson single-cylinder Peashooter period. Exact year-specific details should be checked against factory literature, parts books and documented surviving examples because equipment and specification can vary.
What engine did the Model BA Peashooter use?
The BA Peashooter is associated with a 21-cubic-inch, approximately 350 cc, air-cooled four-stroke single-cylinder overhead-valve engine. The OHV layout is central to the Peashooter identity and to its racing-era importance.
Is the Model BA Peashooter the same as a Harley-Davidson Strap Tank?
No. Strap Tank refers to much earlier Harley-Davidson pioneer singles with strap-mounted tank construction. The Model BA Peashooter is a late-1920s to early-1930s motorcycle with a different chassis, engine era, transmission arrangement and collector category.
Why is it called a Peashooter?
The Peashooter nickname is commonly tied to the sharp exhaust note and small-displacement racing character of Harley-Davidson's 21-cubic-inch singles. It is a collector and enthusiast term rather than a simple guarantee that any given motorcycle is a correct factory racing machine.
How do I identify a real BA Peashooter?
Start with documentation, engine and frame numbers, and correct OHV single-cylinder architecture. Then inspect the frame, fork, gearbox, carburetor, ignition equipment, tanks, fenders, hubs and controls against year-correct references. Racing claims require stronger evidence than appearance alone.
Are parts available for restoring a Model BA Peashooter?
Some parts can be sourced through veteran Harley-Davidson specialists and marque networks, and certain reproduction components exist. Correct engine, valve gear, ignition, carburetion and year-specific cycle parts can be difficult and expensive, so incomplete projects should be bought very carefully.
What makes a BA Peashooter valuable to collectors?
Collectors value correct model identity, original major components, documented provenance, proper OHV Peashooter specification and, where applicable, credible racing history. Cosmetic racing style alone is not enough; the best examples are supported by parts accuracy and evidence.
Collector Takeaway
The Harley-Davidson Model BA Peashooter matters because it shows Milwaukee thinking small, fast and technically sharp at a time when the company's public image was increasingly tied to larger twins. Its 21-cubic-inch OHV single is the key: a compact racing-era engine that gives the motorcycle a mechanical personality unlike the heavyweight Harleys that dominate most collections.
A correct BA is not merely a charming antique. It is evidence of Harley-Davidson's involvement in lightweight competition and of a moment when American motorcycle engineering had not yet narrowed into familiar postwar categories. For the collector who values accuracy over folklore, the Model BA Peashooter is one of the most rewarding Harley-Davidsons to study—and one of the easiest to misunderstand if the nickname is allowed to do the work of documentation.
