The Morini 350 V-Twin: A Seventies Gem

In the vibrant landscape of 1970s motorcycling, a select few machines truly captured the imagination and earned widespread admiration. Among these, the Moto Morini 350 V-twin stands out as a testament to innovation and engineering prowess. This lightweight Italian marvel punched well above its weight, incorporating technologies that wouldn't become commonplace for many years. It offered a delightful blend of spirited performance, precise handling, and captivating aesthetics, earning it a devoted following among those fortunate enough to experience its unique charm. First unveiled as a prototype in 1971 and becoming more accessible in the UK from 1974, the 350 Morini was offered in both 'Sport' and 'Strada' variants, each featuring distinct engine tunes and cosmetic treatments.

The arrival of the 350 marked a significant chapter for Moto Morini, occurring shortly after the passing of its founder, Alfonso Morini, a figure who had steered the company since before the First World War. Under the leadership of his daughter, Gabriella Morini – a rarity in the male-dominated world of motorcycle manufacturing – the company embarked on a mission to replace its ageing range of compact single-cylinder engines. Gabriella's strategic decision to recruit Franco Lambertini, a renowned Ferrari engine designer, and pair him with Morini's chief factory general manager, Gianni Marchesini, proved to be a masterstroke. Together, this talented duo conceived an engine that was, by all accounts, close to perfection for its intended purpose. The result was a remarkably compact 72-degree V-twin, a design that was a world away from anything else on the market.

The Heart of the Machine: A Revolutionary Engine Design

The genius of Lambertini's design lay in his bold departure from conventional engine architecture. Eschewing the ubiquitous domed piston combustion chamber favoured by virtually every other motorcycle manufacturer at the time, he opted for the innovative Heron head. This ingenious arrangement placed the combustion chamber within the piston itself, complemented by a flat cylinder head. The pistons were forged for enhanced strength and durability, while the inserts were meticulously machined. Crucially, the cylinder heads were designed to be interchangeable, simplifying maintenance and potential repairs.

The Heron head, a design more commonly found in high-performance automotive engines from prestigious marques like Jaguar, Brabham racers, and Alfa Romeo, was a rarity in the motorcycle world. A primary reason for its infrequent use in bikes was the inherent challenge in accommodating the valve actuation mechanism. This setup requires both valves to move vertically, perpendicular to the piston's travel, a configuration that can lead to increased engine height, a critical consideration in motorcycle design where compactness is paramount. However, the Morini engine's valve gear was a triumph of compact and efficient engineering, being both simple to adjust and remarkably well-integrated.

The valves were actuated by a pair of pushrods per cylinder, with the rear pushrods being marginally shorter than the front. These were driven by a camshaft positioned between the two cylinders, which was, in itself, a significant innovation. The camshaft was driven by a short belt, marking the first instance of a belt-driven camshaft being employed in a motorcycle engine. These cambelts, identifiable by specific marks on the cam pulley, require periodic replacement, typically every 15,000 miles or two to three years, a crucial maintenance point for owners.

The flat cylinder head design offered another distinct advantage: ease of assembly. Once the engine components were in place, the flat head could be fitted without the need for specialised tools. This simplified the manufacturing process, allowing Morini to employ less specialised assembly staff compared to, for example, the nearby Ducati factory, thereby reducing production costs. It's also worth noting that Morini bravely employed several women on their engine production lines during the 1970s, a progressive and revolutionary approach for the era in Italy. While initial development did raise concerns about potential combustion issues in such a small engine, skilled refinement of the carburettor inlets and exhaust outlets resulted in an engine that was largely free from such problems. The innovative Heron head design even proved influential, with Moto Guzzi adopting it for their V35/50 Twins later in the decade.

Beyond the Engine: Chassis and Variants

Complementing its revolutionary engine, the Morini 350 was housed in a classically simple and robust double-cradle frame. This design featured minimal front bends, a substantial top tube, excellent bracing, and near-perfect geometry, contributing significantly to the bike's superb handling characteristics. It is worth noting that minor variations exist between earlier and later frame designs, with a distinctive kink present in the down tubes of the later models.

The two primary variants, the Sport and the Strada, catered to different rider preferences:

• Sport: This model boasted a higher specification, featuring clip-on handlebars, premium Marzocchi forks and rear shocks, a steering damper for enhanced stability, lightweight alloy rims, and a double-sided SLS drum front brake. It also sported elegant stainless-steel mudguards and a distinctive two-colour paint scheme on the fuel tank. The ignition switch was cleverly mounted beneath the tank, and the Morini may have been the first motorcycle equipped with an electric fuel tap, a substantial solenoid-operated unit complemented by a manual reserve tap on the opposite side. The original Sport seat featured a stylish hump, though it offered limited space for a pillion passenger. Rearset foot controls, a chromed CEV headlight mounted on Grimeca brackets, and a tail-light, shared with contemporary Ducati and Moto Guzzi models, completed the sporty package. Later iterations of the Sport were fitted with a chromed disc brake on spoked wheels, with the option for a dual-disc setup, and Grimeca calipers, which provided ample stopping power for the spirited V-twin. Opinions on the efficacy of the drum versus disc brakes can vary; some riders find the drum brakes to be grabby, while others feel the disc brakes, while effective, may not be entirely up to the task of stopping the bike with absolute authority, often depending on the specific machine owned.
• Strada: Positioned as the touring or 'GT' version, the Strada initially featured Paoili forks before adopting the Marzocchi units found on the Sport. It was equipped with a more conventional 2LS front drum brake, which was later superseded by a single disc brake. The Strada offered a longer, more comfortable seat, basic footpegs, and traditional handlebars. For everyday riding, the Strada often proved to be the more practical all-round motorcycle, offering a more forgiving riding position, better fuel economy, and smoother power delivery.

Later models saw further enhancements, including powder-coated Grimeca cast wheels and the popular addition of Marzocchi gas shocks with remote reservoirs. An electronic rev counter was also available. The early 70s Sport models are particularly desirable, especially those with the drum front brake, fetching higher prices on the classic bike market. The wire-spoked wheel version with the optional disc brake, produced for a brief period between 1976/77, is often considered a superior ride, offering improved braking performance and a slightly more comfortable riding experience with the bugs ironed out. The cast wheel disc models, produced from 1978 onwards, are more common and generally easier to start and maintain, often featuring an uprated alternator. For those seeking the most user-friendly classic Morini, the late 1970s to early 1980s Strada models are the most practical choice.

Performance and Price Point

The Morini 350 garnered significant praise from motorcycle journalists of the era, often favourably compared against rivals like Honda's CB400 four and Yamaha's RD400, with the Italian V-twin frequently emerging as the preferred machine. However, Morini faced a significant challenge in its pricing strategy. The bikes were considerably more expensive than their Japanese counterparts; a 350 Sport would cost approximately £200-£300 more than a comparable Japanese 400cc machine. At its launch, the Sport's price was comparable to that of a Norton Commando, and it remained a premium offering. By 1979, its price was only marginally less than a Kawasaki Z650 and exceeded that of a Triumph Bonneville.

Technical Details and Innovations

The engine's fuel delivery was managed by Dell'Orto flatslide carburetors. The front cylinder received fuel on the left side, with the exhaust port on the right, ensuring that the cylinder and cylinder head cooling were not impeded by the exhaust pipe. The rear cylinder operated in reverse, with the carburetor on the right and a short, heat-shielded exhaust pipe running down the left side, connected to the right side via a balance pipe. The exhaust pipes were secured with castle nuts and split collets, and both carburetors drew their air from a filter box located beneath the fuel tank.

The 350 engine was paired with a six-speed gearbox featuring a right-foot shift pattern. It employed a dry clutch, a choice influenced by Lambertini's desire for a sportier feel and the perceived inability of the oil filter – a broad plastic mesh unit spanning the vertically split crankcases – to effectively manage the debris typically produced by a wet clutch. The Morini featured a left-hand kickstart, which, despite initial appearances, proved to be surprisingly user-friendly.

Another significant innovation was the adoption of electronic ignition. This system drew its power not from the battery, but from a coil within the generator, meaning the motorcycle could be kickstarted even with a flat battery. Later models were equipped with an electric starter, a substantial unit mounted at a 90-degree angle to the crankshaft. It engaged via a short chain connected to three bob weights, which used centrifugal force to engage with a dish on the exterior of the right-hand generator. While not a resounding success, the robust kickstart mechanism was more than capable of reliably turning over the engine.

Despite the often-criticised reputation of Italian electrics in the 1970s, the Morini's electronic ignition system was generally reliable and straightforward to set up, with the actuator conveniently mounted on the left-hand end of the camshaft. However, the rest of the electrical system, particularly the circuit board situated beneath the right-hand side panel, could be a complex and challenging affair, often described as a "nightmare of electrical spaghetti."

Evolution and Legacy

The 350 Morini underwent several updates throughout its production run. The 'K' series represented one of the last iterations of the original design, featuring revised aesthetics. Later models incorporated 1980s graphics, a small nose fairing, a belly pan, and a rectangular headlight. A notable change was the introduction of a left-foot gear change. The Morini engines also found their way into custom motorcycle offerings from the US after Cagiva acquired the factory in the late 1980s, as part of a complex deal that also saw them gain control of Ducati. The Excalibur and New York custom models, built at the Ducati factory, certainly polarised opinions with their distinctive styling. Less controversial, and indeed quite successful, were the Kanguro trail bikes, which effectively utilised the robust Morini engine.

The final iteration of the 350 was the Dart, a rather unusual machine almost entirely encased in white plastic. It featured the Morini engine transplanted into the frame of a Cagiva 125 sports bike. The success of this combination is a testament to both the inherent lightness and smooth power delivery of the Morini engine and the quality of the Cagiva frame. Today, the affection for the 350 V-twin endures, with the latest revival of the Morini brand, featuring the hand-built Corsaro 1200 V-twin in 2006, even seeing its design consciously mirror the compact V-twin of the original 350. Furthermore, Franco Lambertini himself returned to design the Bialbero Corsa Corta 1187cc V-twin, a clear nod to his earlier groundbreaking work.

Frequently Asked Questions

Do M01/M1 engines use the same crank?

Yes, M01/M1 engines can use the same crank. There are two versions of the crank for these engines: Bush Bearing and Needle Bearing. The M02 engine does not use the same crank, although the stroke is identical. The M02 crank is longer on the clutch side to accommodate an additional set of clutch and gears.

What made the Morini 350 V-twin so special?

The Morini 350 V-twin was special due to its innovative Heron head engine design, belt-driven camshaft, compact 72-degree V-twin configuration, excellent handling, and stylish aesthetics. It offered a unique blend of performance and character that set it apart from its contemporaries.

What are the main differences between the Sport and Strada models?

The Sport model was the higher-specification version with clip-on handlebars, better suspension, and often a disc brake. The Strada was the more touring-oriented variant with conventional handlebars, a more comfortable seat, and typically drum brakes (though later models featured discs).

Was the Morini 350 expensive for its time?

Yes, the Morini 350 was considered expensive compared to its Japanese rivals, often costing significantly more than comparable 400cc machines. However, its unique engineering and performance justified its premium price for many enthusiasts.