
The "old glory" Aprilia 2 storkes 50cc engine is still in production, but a new model has been introduced with a newer engine: the RS4 50cc.
PRODUCT UPGRADE: APRILIA RS4 50 2 STROKES
The "old glory" Aprilia 2 storkes 50cc engine is still in production, but a new model has been introduced with a newer engine: the RS4 50cc. Style of the bike has changed, but the overall design of the Arrow exhaust is very close to a standard 2 strokes engine, with a muffler providing the volume to handle pressure waves and a silencer damping the noise. The result is a low-mount silencer, fitted close to the RH footpeg, made in titanium. Muffler is in transparent-coated steel, and it is designed to fit under OE bodywork and to have correct volume and profile to take out the best performance from the engine. Power output (measured on wheel) is around 8.5hp, compared to the 7hp with the OE system.
Photo Gallery: Arrow Special Parts | Aprilia RS4 50 & 125 - Sport Rider Magazine
Photo Gallery: Arrow Special Parts | Aprilia RS4 50 & 125 - Sport Rider Magazine










Tom Sykes and Joan Lascorz joined forces in the new-look Kawasaki Racing Team for a first 2012 test at Almeria in Spain on 19 and 20 January. The new initiative of a long winter test ban (brought in by the series organisers this season) has only recently ended and therefore the Almeria sessions gave the whole KRT effort an opportunity to get back together and enjoy some some valuable track time with the Ninja ZX-10R.









