Rieju RS 3 [2013] - TOP PERFORMANCE cylinder set ø 49.5 Racing "Due plus" with double head for Minarelli 50cc

Racing cylinder set for the Rieju RS 3 from 2013

The TOP PERFORMANCES cylinder set “Due plus” is designed for the Rieju RS 3, built in 2013. The cylinder has a bore of 49.5 mm and a displacement of 75 cm³. The set includes a two-piece head with combustion chamber and combustion chamber cover.

Structure and function

With the redesigned head, a larger portion of the combustion chamber is in contact with the coolant. This supports temperature control in the intended area. The compression ratio is tailored to the adjusted temperature values. The cylinder is made of special “MINACROM” cast iron with added chrome. The high silicon content piston and 1 mm thick chrome-plated steel piston ring complement the racing cylinder set.

Technical data

• Bore: 49.5mm
• Stroke: 39mm
• Displacement: 75 cm³
• Squish: 0.9 ±0.1mm
• Exhaust control diagram: 195°
• Control diagram overflow channels: 128°
• Geometric compression ratio: 14.5:1
• Compression ratio actual: 7.9:1
• Piston pin: Ø 12 x 42 mm
• Roller bearing for piston pin: Ø 12 x 15 x 15 mm

Scope of delivery

• Cylinder, piston, piston ring, piston pin and roller bearing
• 2 circlips for the piston pin
• Combustion chamber and combustion chamber cover
• 8 green Viton O-rings Ø 7.66 x 1.78 and green Viton O-rings Ø 53.7 x 1.78, Ø 22.22 x 2.62 and Ø 28.24 x 2.62
• O-ring Ø 104.37 x 3.54
• Reduction for temperature sensor, cap M14 x 1.25, aluminum gasket for cover M14 x 1.25 and cylinder base gasket with 0.5 mm thickness
• Reducing bushing from Ø 28 to Ø 25 mm