PRO RACING DESIGN
1
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY AND
COMPLETELY BEFORE OPERATING THE ENGINE
RK125W.07
FOR THE FIRST
TIME.
Congratulations on your purchase of the PRD RK125W high performance kart engine. The PRD
RK125W is the product of a thorough research, design and development program and employs the
latest in engine performance.
The PRD RK125W has been engineered to provide the user with trouble free operation and an
extended service life with a minimum of routine maintenance. Please read this booklet carefully so
that you can keep your engine in tip-top condition thus ensuring you have many satisfying hours of
performance racing.
Please note that due to PRD’s on-going development program there may be some data in this
booklet that will be upgraded from time to time. If this situation arises, we suggest you consult your
nearest PRD sales & service outlet for advice.
1. SPECIFICATIONS
1. MODEL:
RK125W07
TAG
2.
TYPE:
2 STROKE WATER COOLED SINGLE CYLINDER REED
VALVE INDUCTION
3. CAPACITY:
124cc
4.
BORE:
53.70 ( FIRST PISTON 53.60)
5. STROKE
54mm
6. H.P./RPM
28H.P./15,800RPM
7. CARBURETOR:
TILLOTSEN
HL-360A
8. IGNITION:
C.D.I
(OPPAMA)
9.
IGNITION TIMING:
2.20mm BTDC [STANDARD]
10. SPARK PLUG:
NIPPON DENSO W27ESU [RUN IN ONLY]
W29ESU [RECOMMENDED RACING]
11. SPARK PLUG GAP:
0.60mm [0.024”]
12. FUEL OIL RATIO:
16:1 PREMIUM GRADE UNLEADED PETROL
13. PISTON
TYPE:
COATED
PISTON
14. PISTON
CLEARANCE:
0.10mm
[STANDARD]
15. RING
TYPE:
DYKES STYLE (L RING)
16. RING GAP:
0.25mm [0.010”] MIN.
17. CYLINDER
HEAD
VOLUME: 10.2cc
18. COMPRESSION:
13 : 1
19. CRANKSHAFT:
2 PIECE, FORGED & INDUCTION HARDENED
20. CONROD:
100mm STEEL CNC MACHINED