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Fits NCY 63mm Big Bore Kit #1100-1253
Keep the other as a spare
you can mix and match different roller masses to dial in your personal torque curve
9mm outer skirt
Exhaust, Polini - VSX qmb139 Fits NCY 63mm Big BorePolini expansion chamber performance exhaust system for Vespa P200 model scooters. An expansion chamber exhaust significantly improves engine power output by enhancing its volumetric efficiency resulting in more power and better performance across a wider RPM range. Polini delivers a great pipe at a great price! Compatibility: Vespa P200E VSX Vespa PX200 VSX Vespa PX200E VSX Vespa Rally 200 VSE (Lower Clearance) Remember you'll need to re jet your
