Robin EY15 User Manual

54-3 PISTON and PISTON RING
1) If no ring expander is available, install the rings by placing the open ring ends over the first land of the piston and
spreading the rings only far enough to slip them over the correct kg grooves.
NOTE: Pay attention not to break the rings by twisting. Install the oil ring first followed by the second ring and then
top ring. Meantime, the surfaces
of the second ring and the top ring with carved marks are to be faced up.
I
Piston Ring I
I
Fig. 28
I
I
I
EY15,20
EY28
I
Top Ring
Taper Barrel Face
Second Ring
Taper Under Cut
. - . .. J
Oil Ring
Cutter Ring
(without expander) (with expander)
Fig. 29
2) Reassemble the piston and connection rod by means of the piston pin.
NOTE: Apply enough oil to the small top end of the connecting rod.
Be sure to place the clips on both ends of the piston pin.
- 29 -

Robin EY15 Specifications

General

Ignition System	Transistorized magneto
Starting System	Recoil starter
Compression Ratio	8.5:1
Fuel System	Carburetor
Engine Type	Single cylinder, 4-stroke, air-cooled
Displacement	143 cc
Maximum Torque	9.3 Nm / 3000 rpm
Dry Weight	13.5 kg
Lubrication	Splash