1.

MODEL:

RK80RV

2.

TYPE:

2 STROKE AIR COOLED SINGLE CYLINDER REED VALVE INDUCTION

3.

CAPACITY:

78cc

4.

BORE:

46.6mm

5.

STROKE:

46mm

6.

H.P. / RPM

12HP / 11,000 RPM

7.

CARBURETOR:

ENZO BUTTERFLY 25-19 OR WALBRO WB42 WITH CHOKE

8.

IGNITION:

CDI WITH INTERNAL ROTOR

9.

IGNITION TIMING:

1.8mm BTDC [STANDARD]

10.

SPARK PLUG:

NDENSO W24ES-U [RUN IN ONLY]
NDENSO 27ES-ZU TO 29ES-ZU [RECOMMENDED RACING]

11.

SPARK PLUG GAP:

0.60mm [0.024”]

12.

FUEL OIL RATIO:

16:1 PREMIUM GRADE UNLEADED PETROL

13.

PISTON TYPE:

UNCOATED SINGLE RING

14.

PISTON CLEARANCE:

0.10mm [STANDARD]

15.

RING TYPE:

FLAT TYPE 1mm THICK

16.

RING GAP:

0.25mm [0.010”]

17.

CYLINDER HEAD VOLUME:

8cc

18.

COMPRESSION RATIO:

7:5:1 [NOMINAL]

19.

CRANKSHAFT:

2 PIECE, FORGED & INDUCTION HARDENED,
FULLY GROUND

20.

CONROD:

100mm STEEL FORGED & MACHINED
TOP AND BOTTOM NEEDLE ROLLER BEARING

21.

CRANKPIN:

GROUND STEEL – 18mm diameter x 45mm OVERALL LENGTH

22.

PISTON PIN:

GROUND STEEL – 14mm diameter x 37mm OVERALL LENGTH