High-quality crankshaft for Motovespa GT160 engines

Motovespa GT 160

The Spanish licensee Motovespa S.A., based in Madrid, has developed the Motovespa 160 (09C). Definitely a strange one - electronic ignition similar to the Serveta Lambrettas, but still with piston ports. The body is basically a Sprint/Rally, but the engine is a strange mix of old and new technology. People often confuse the Motovespa 160 with the Super Sport 180, but at second glance you can see the many differences. Finally, the Vespa 160 GT was a version with a number of side panels and accessories that made it even more attractive. Exploded views here

BGM Pro crankshaft

The BGM Pro crankshaft for the GT160 is available in different versions. In general, all versions fit the original Femsatronic ignition of the GT160. On the drive side, there are variants for the original GT160 clutch or the variant to use the PX clutch type. All PX 6- and 7-spring clutches as well as all Cosa and bgm Superstrong clutches can be used here. For crankshafts with type PX clutch stub, the thrust washer bgm6033 and the Woodruff key 9999002 are also required.

We offer both versions with a standard stroke of 57 mm and a long-stroke version with a stroke of 60 mm. For the crankshafts with 60mm stroke, the engine housing must be modified to create space for the lower connecting rod eye. As only a small amount of material (0.8 to 1mm in radius) needs to be removed, this task can be easily completed in a few minutes using a hand milling cutter. With the 60mm stroke variant, the control angles of the cylinder change. Typical for the GT160 cylinder are the relatively large control angles for the overflow ducts in conjunction with the very short control angle of the exhaust duct. With the original 57mm stroke, the cylinder has the following control angles: Piston protrusion 0.5mm Intake angle: 131° Exhaust angle: 144° Transfer angle: 119° Advance angle: 12.5° If the same cylinder with 60mm stroke is used, the following control angles result: Piston protrusion: 1mm Intake angle: 132° Exhaust angle: 148° Transfer angle: 124° Advance angle: 12°

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