VMC 244 Explorer cylinder Ø72 mm, 244 ccm, central spark plug
Conversion kit for Vespa 200 engines: Rally 200, P200E, PX200 E, PX200 Lusso, PX200 (1998), PX200 MY, Cosa 200.
The VMC 244 Explorer is a high-displacement sports cylinder for classic Vespa 200 engines. The focus is on torque and a rideable power curve. Technically, the Explorer uses the long rod concept: pistons and transfer windows work above the housing sealing surface with a large surface area and volume.
244 cc
7 transfer ports
Central spark plug
Head with O-ring
Steel exhaust flange with O-ring
Housing must be machined
Technology: Long rod and shell molding
VMC uses a shell-moulded aluminium cylinder for the Explorer. The raceway is finished with a nickel-silicon coating. In combination with a 60 mm stroke crankshaft and long connecting rod (126-127 mm, depending on the shaft), the overflow system is "lifted" by design. This provides more usable overflow area and volume - a key factor in powerful 2-stroke setups.
Technical data
| Bore | Ø72 mm |
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| Stroke | 60 mm |
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| Connecting rod length | 126 mm (Quattrini/Benelli shafts) or 128 mm (BGM shafts), Long-Rod range 126-128 mm |
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| Displacement | 244 cc |
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| Transfer port | 7 |
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| Control angle | Transfer port approx. 120°, exhaust approx. 178° |
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| Exhaust | Oval-shaped duct, bolted steel exhaust flange |
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| Cylinder head | recessed, silicone O-ring, 8 bolts |
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| Spark plug | central |
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| Cylinder base | Ø76 mm, immersion depth approx. 8 mm |
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Piston and rings
The kit includes a high-quality Meteor piston. The piston skirts have an anti-friction coating based on molybdenum disulphide (MoS2). The piston rings are chrome-plated steel rings.
Head and exhaust flange with O-ring
Head: recessed design with silicone O-ring and 8 fixing points
Exhaust: Steel flange with silicone O-ring, fixed via retaining bracket and 4 screws
Assembly: Housing machining is mandatory
The Explorer has an approx. 8 mm long cylinder bore (cylinder sleeve) that plunges into the engine housing. To do this, the cylinder inlet on the engine housing must be machined to Ø76 mm and 8 mm depth. VMC supplies a steel basette or guide for this, which is screwed to the housing halves. The machining can also be carried out manually with a suitable milling cutter - the instructions in the manual are crucial here.
Workshop solution: precise machining on the milling machine is also possible
Note: without machining, the cylinder base will not fit into the housing opening
More stroke possible: 62 and 64 mm
The cylinder's long bore ensures clean piston guidance. This means that the Explorer is designed in such a way that it can also be operated with a stroke of 62 mm or 64 mm. In this case, the control angles can be specifically adjusted using suitable spacers and the geometry of the crankshaft.
Gaskets and spacers included in the scope of delivery
| Paper gaskets (cylinder) | 0.2 / 0.3 / 0.4 / 0.5 mm |
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| Aluminum spacer head to cylinder | 0.3 / 0.5 / 1.0 mm |
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| Aluminum spacer cylinder base | 0.5 / 1.0 mm |
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Conclusion
The VMC 244 Explorer combines long rod geometry, 7 transfer ports and a modern aluminum cylinder construction with a nickel-silicon bore. If you are prepared to machine the engine case cleanly to Ø76 mm, you get a consistently designed 244 cc setup for Vespa 200 engines.
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