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and SYM DD50 Vespa / Lambretta Vintage 2-stroke performance tuning (requires manifold) Technical Specs
Nitro Sport and Pug scooters and bikes running 50cc 4-stroke 139QMB engines
External ignition coil
First oversize replacement piston ring for the PCK2 P125/150/Stella Polini kit
Wire Gauge: 4
Prima 4mm Main Jet Tuning Kit - Keihin PB & CVK Carburetors Clutches (manual) and SYM DD50 Vespa /Fine Tune Your Fuel: 10 Piece Prima 4mm Main Jet Kit Standard factory jetting is almost always "lean" to meet emissions standards, which can leave your scooter feeling sluggish. The Prima 4mm Main Jet Kit is the essential tool for riders installing big bore kits, performance exhausts, or high flow air filters. With 10 precision machined sizes, you can eliminate "flat spots" and find the perfect air fuel ratio for maximum throttle response. The Tuners
