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BIG BORE Testa Rossa 94 cc The new generation BIG BORE engine! Stud bolts, only for liquid-cooled scooters (7 ports and exhaut crossbar - piston with 1 segment - modular head - required boring of original case or C-One Malossi case - engine shaft with connecting rod different from the original). Deriving directly from seven port technology, which animates the revolutionary Flanged Mount, BIG BORE Testa Rossa cylinders represent the latest success achieved thanks to the efforts and studies that Malossi has continued to devote to engines intended for original Piaggio and Yamaha cases and, with…
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The new generation BIG BORE engine!
Stud bolts, only for liquid-cooled scooters (7 ports and exhaut crossbar - piston with 1 segment - modular head - required boring of original case or C-One Malossi case - engine shaft with connecting rod different from the original).
Deriving directly from seven port technology, which animates the revolutionary Flanged Mount, BIG BORE Testa Rossa cylinders represent the latest success achieved thanks to the efforts and studies that Malossi has continued to devote to engines intended for original Piaggio and Yamaha cases and, with their unprecedented capacity of 94 cc, they allow the BIG BORE family to make a significant leap forward.
Externally almost indistinguishable from their flanged counterparts, BIG BORE Testa Rossa cylinders feature a stud bolt framework compatible both with original engines and with the C-One Malossi case. Even inside they are totally similar to Flanged Mounts, thanks to the renowned configuration with seven ports and dual exhaust port, with the only difference given by the limits set by the inner passage of the bolts that affects the size and development of the exhaust.
The head is once again modular, with new internal profiles specifically designed to increase the torque and feeling of the engine, now much brighter and even more progressive. The head cover is made of forged aluminium, red anodized and lathed in high precision CNC machines.


TECHNICAL FEATURES
CYLINDER KIT | COOLING | TIMING SYSTEM | MATERIAL | BORE mm | STROKE mm | CAPACITY mm | ADVANCE | PISTON RING CLEARANCE mm | SQUISH | COMPRESSION RATIO | SPARK PLUG |
3115374 | H2O | 7 ports | Aluminium | 52 | 44 | 93,4 | 16° | 0,15 | 0,55 | 01:14.6 | 6314455.S0 IRIDIUM IW 34 |
3115385 | H2O | 7 ports | Aluminium | 52 | 44 | 93,4 | 16° | 0,15 | 0,55 | 01:14.6 | 6314455.S0 IRIDIUM IW 34 |
Products reserved exclusively for racing in specifically designed locations according to the provisions of the competent sporting authorities. We disclaim all liability for improper use
This is a deliberate machining. As high temperatures are reached at this point with strong expansion, this machining was done to lower the point in order to avoid seizing.
Data sheet
Malossi needle roller bearings are independent bearings that are ready for assembly and constructed from high-tensile steel with housings for the insertion and axial rotation of the rollers. These devices are designed to allow reciprocal movement between two objects, constraining the rotation of the cage and housing the rotating elements with reduced overall dimensions, negligible weight and reduced friction. These are essential components in internal combustion engines which, by definition, have several rotating elements. As can be seen in the image, a needle roller bearing assembly is made…
Fun without complications (6 transfer ports – 2 ring piston) Malossi cast iron thermal units, the first and simplest step to modifying your motorcycl’s engine, are the best choice for continued use of the exhaust system of an approved series or type . For these thermal units, the elevated feature of durability of cast iron is combined with the almost manically high quality standards of Malossi, one of the few companies to demand the most from even this class of thermal units. Into this is inserted the most rigid selections for the joining of the cylinder and the piston, strictly maintained…
CAST-I-CYLINDER KIT Ø 63 CYLINDER The cylinder has a bore of 63 mm with a displacement of 178 cc and completely revised internal fluid dynamics. New port mapping allows for a high degree of coupling both with linked sumps and with completely new sumps, and includes a special profiling designed to optimise flow and obtain significant increases in performance, without the need to carry out any additional work on the vehicle. TRANSFER PORTS The transfer ports have a profile designed to correctly orientate the incoming flow and obtain a high degree of turbulence, thus ensuring improved combustion…
CVF2 CYLINDER TECHNICAL FEATURES ALUMINIUM CYLINDER Cylinders obtained by gravity die-casting in permanent steel moulds. Material: hardened and tempered high silicon content primary aluminium alloy. Machining: on numerically controlled high precision machine tools. Cylinder liner with silicon carbide metal-spray coating on a galvanic nickel matrix, cross-honed with passes with diamonds for very tight tolerances. Recalculated and increased heat exchange surfaces. Exhaust and transfer ports designed and tested for maximum thermodynamic performance. Dimensional and surface finish quality control…
Fun without complications (6 transfer ports – 2 ring piston) Malossi cast iron thermal units, the first and simplest step to modifying your motorcycl’s engine, are the best choice for continued use of the exhaust system of an approved series or type . For these thermal units, the elevated feature of durability of cast iron is combined with the almost manically high quality standards of Malossi, one of the few companies to demand the most from even this class of thermal units. Into this is inserted the most rigid selections for the joining of the cylinder and the piston, strictly maintained…
TECHNICAL SPECIFICATIONS Cylinder Bore Ø 75.5 mm; Stroke 63 mm; Displacement 282; Compression ratio 12.5:1. Material: primary aluminium alloy with a high content of hardened and tempered silicon, cylinder liner with silicon carbide coating in a galvanic nickel die and crossed smoothing with two diamond passages with very limited tolerances. Machining: on machine tools with high precision numerical control. Cylinder-piston connection with an allowance of 0.05 mm. Recalculated and upgraded heat exchange surfaces. Piston Ultra compact with 3 rings. Material: special aluminium alloy with high…
Technical features Material: special aluminium alloy with high percentage of silicon and titanium that guarantees exceptional strain strength even at high temperatures. Heat treatment: special quenching and stabilizing treatment that gives the material increased toughness and strength, guaranteeing that mechanical and size specifications will remain unaltered for temperatures of up to 250 °C. Chip-forming machining: carried out on NC machining centres with extremely-limited size and shape tolerance (roundness, perpendicularity). Inner surface coating: effected using silicon carbide on a…
Fun without complications (6 transfer ports – 2 ring piston) Malossi cast iron thermal units, the first and simplest step to modifying your motorcycl’s engine, are the best choice for continued use of the exhaust system of an approved series or type . For these thermal units, the elevated feature of durability of cast iron is combined with the almost manically high quality standards of Malossi, one of the few companies to demand the most from even this class of thermal units. Into this is inserted the most rigid selections for the joining of the cylinder and the piston, strictly maintained…
Cylinder Material: primary aluminium alloy with a high content of hardened and tempered silicon, cylinder liner with silicon carbide coating in a galvanic nickel die and crossed smoothing with two diamond passages with very limited tolerances. Machining: on machine tools with high precision numerical control. Cylinder-piston connection with an allowance of 0.05 mm. Recalculated and upgraded heat exchange surfaces. Piston Ultra compact with 3 rings. Material: special aluminium alloy with high silicon content, low thermal expansion and a tin facing on the sliding surfaces. Machining on machine…
Technical data Material: cast iron Cooling: air Bore: 50 mm Stroke: 37,8 mm Capacity 74 Compression ratio: 11:01 Timing system: 4 ports
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