Description

Doppler S1R Crankshafts for more compression and power

The Doppler S1R is a full-round Crankshafts that increases the primary compression in the engine and thus also the overall power. A full-round Crankshafts means that the crankcase gets a larger volume with each stroke, which pushes more fuel mixture into the Cylinders for a more explosive combustion. The Crankshafts are geared with a heavy-duty silver bottom bearing that ensures high durability and smooth operation even under load. It is balanced to 16,000 rpm and comes complete with Needle Bearings of 12x17x13mm.

Suitable for Piaggio, Gilera, Aprilia and Vespa with Hiper engine

This version of the Doppler S1R Crankshafts is designed for scooters with Piaggio’s Hiper engine, including popular models such as Piaggio Zip, Piaggio NRG, Gilera Runner, Aprilia SR 50 and Vespa LX 50. It fits ø12mm cross pin, so check this before purchase to ensure it matches your cylinder kit and Pistons. Note that there is a similar model for the Minarelli horizontal engine with ø10mm crosspin, so choose the right version for your scooter.

Worth knowing about Doppler S1R Crankshafts

• All-round construction for increased primary compression and engine power
• Heavy-duty silver bottom bearing for high durability
• Balanced to 16,000 rpm
• Supplied incl. Needle Bearings, 12x17x13mm
• Cross pin: ø12mm, inner diameter: 17mm
• Fits Piaggio engines, including Piaggio Zip, Gilera Runner and Aprilia SR 50