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PRD RK125W Instructions Manual

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PRO RACING DESIGN
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY AND
COMPLETELY BEFORE OPERATING THE ENGINE
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.
MODEL:
2.
TYPE:
3.
CAPACITY:
4.
BORE:
5.
STROKE
6.
H.P./RPM
7.
CARBURETOR:
8.
IGNITION:
9.
IGNITION TIMING:
10. SPARK PLUG:
11. SPARK PLUG GAP:
12. FUEL OIL RATIO:
13. PISTON TYPE:
14. PISTON CLEARANCE:
15. RING TYPE:
16. RING GAP:
17. CYLINDER HEAD VOLUME: 10.2cc
18. COMPRESSION:
19. CRANKSHAFT:
20. CONROD:
TIME.

1. SPECIFICATIONS

RK125W07 TAG
2 STROKE WATER COOLED SINGLE CYLINDER REED
VALVE INDUCTION
124cc
53.70 ( FIRST PISTON 53.60)
54mm
28H.P./15,800RPM
TILLOTSEN HL-360A
C.D.I (OPPAMA)
2.20mm BTDC [STANDARD]
NIPPON DENSO W27ESU [RUN IN ONLY]
W29ESU [RECOMMENDED RACING]
0.60mm [0.024"]
16:1 PREMIUM GRADE UNLEADED PETROL
COATED PISTON
0.10mm [STANDARD]
DYKES STYLE (L RING)
0.25mm [0.010"] MIN.
13 : 1
2 PIECE, FORGED & INDUCTION HARDENED
100mm STEEL CNC MACHINED
1
RK125W.07
FOR THE FIRST

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Summary of Contents for PRD RK125W

  • Page 1 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.
  • Page 2 PRO RACING DESIGN 2. FUEL / OIL 2.1 For Australia: Use only premium grade unleaded pump petrol. 2.2 Other Countries: Consult your karting controlling organizations for the appropriate legal fuel. 2.3 Oil: Use only high quality 2-stroke racing oil in a mix ratio of 16:1. RECOMMENDED OILS: SILKOLENE CASTORENE R30 / CASTROL R30 / SHELL X100 SUPER M.
  • Page 3 4. GOING RACING In the previous section we dealt with the “run-in” period for your PRD engine. Once completed your engine is now ready for racing. In this section we will give you some tuning “TIPS” and advice that will help you successfully race your PRD.
  • Page 4 An increase in length will improve bottom end performance. Gear Ratio: The PRD engine is supplied standard with a 10 or 11 teeth engine sprocket. The choice of final drive ratio will be dependant upon a number of variables and may alter from race track to race track.
  • Page 5 5.1.1 Diaphragms and gaskets should be checked for damage and replaced if necessary. [PRD recommends the use of walbro diaphragm repair kit #350-800 or PRD part #EPY669C where...
  • Page 6 9psi. If your carburetor fails to operate efficiently at this pressure, we suggest you consult your nearest PRD sales & service outlet. Piston & Ring: The piston & ring should be checked after 3 race meeting or extended test session.
  • Page 7 PRO RACING DESIGN Piston to Cylinder Clearance: If piston to cylinder measurement exceeds maximum tolerance – replace piston. WARNING: If it is necessary to remove the piston from the conrod to carry out these procedures then care must be taken to prevent the piston pin circlips or any other foreign object falling into the crankcase of the engine.
  • Page 8 PRO RACING DESIGN The “reading” of a spark plug is an acquired skill. The following table is a guide. Reference should be made to the photos in the plug manufacturers specification booklet to assist in determining the correct visual appearance when “reading” a spark plug. TABLE Insulator Color Decision...

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