Moto Guzzi V7 Sport, 750 S & 850 T Service Manual (1971-1975)

Moto Guzzi developed the V7 Sport at the start of the 1970s as the sporting transformation of its established transverse V-twin platform. Engineer Lino Tonti worked toward a simple target that became part of the model’s legend: roughly 200 km/h, 200 kg and a five-speed gearbox. The resulting motorcycle combined a substantially revised 748 cc engine with a compact double-cradle frame, shaft final drive and a low, purposeful riding position. Moto Guzzi’s own historical account records the V7 Sport’s debut in 1971 and its third-place finish in the 500 Kilometres of Monza that June, followed by further endurance-racing success. See the manufacturer’s official history of the V7 lineage.

The V7 Sport became one of the defining Italian sporting motorcycles of its period. Its 748.4 cc air-cooled 90-degree V-twin used an 82.5 × 70 mm bore and stroke, 9.8:1 compression and twin 30 mm Dell'Orto carburetors. Factory output was listed at 53 hp at 6,300 rpm. A five-speed constant-mesh transmission and cardan shaft final drive gave it a mechanical layout that remained unmistakably Moto Guzzi, while Tonti’s frame brought the stiffness and compactness needed for higher-speed road and endurance use. Early machines used the distinctive four-leading-shoe front drum, with disc-brake equipment appearing as the platform evolved.

In 1974 the sporting line became the 750 S. Moto Guzzi’s official history describes it as the replacement for the V7 Sport, retaining the core 750-class engine and Tonti-frame concept while modernising the model’s identity. The 750 S adopted twin 300 mm hydraulic front discs in place of the earlier drum arrangement and paired that change with revised styling and graphics. Mechanically, it remained closely related to the V7 Sport, which explains why the two models share most of the workshop procedures in this publication. The transition from V7 Sport to 750 S also marked Moto Guzzi’s gradual move away from the original V7 naming convention.

The 850 T extended the same architecture into the larger-displacement generation. Its air-cooled V-twin grew to 844 cc through an 83 × 78 mm bore and stroke, with 9.5:1 compression and factory output of 53 hp at 6,000 rpm. It retained twin 30 mm Dell'Orto carburetors, a five-speed gearbox and shaft drive, but used revised gearing, a larger 25-litre fuel tank and twin 300 mm front discs. In character it moved the Tonti-frame formula toward a broader road-touring role while preserving the low-maintenance shaft-drive layout and longitudinal V-twin that defined the family.

This sequence from V7 Sport to 750 S and 850 T formed an important bridge between Moto Guzzi’s original V7 era and the later 750 S3, 850 T3 and Le Mans families. The manual itself covers the shared mechanical foundation and then provides a dedicated supplement for 850 T differences, but the historical progression is the more important context: a single Tonti-frame idea evolved from a focused 750-class sport motorcycle into the basis for much of Moto Guzzi’s 1970s large-capacity range. Related workshop publications are grouped in the Moto Guzzi service manual catalog.