Technical Specifications

PRD FIREBALL RK125cc WC TECHNICAL SPECIFICATIONS
  MANUFACTURER:

PRO RACE DESIGN
  MAKE:

PRD
  MODEL:

RK125 WC (FIREBALL)
  INLET TYPE:

REED VALVE


PICTURE OF MOTOR




TECHNICAL INFORMATION



CHARACTERISTICS


MEASUREMENT


TOLERANCES

  Volume of cylinder 125.25 cc 125 cc
  Original Bore 53.68 mm  
  Theoretical maximum bore 54.25 mm  
  Stroke 54.00 mm 0.05 mm
  Cooling system WATER COOLED  
  Number of carburation systems Tillotson (HL-360) ONE ONLY  
  Number of transfer ducts, cylinder/sump 3  
  Number of exhaust ports /ducts 3  
  Shape of the combustion chamber SPHERICAL WITH SQUISH  
  Length between the axes of the connecting rod 100.00 mm 0.10 mm
  Weight of the connecting rod 100 grams 5 grams
  Volume of combustion chamber 10 cc 0.5 cc
  Type of bearings and size:
      (example) 6205 type
Big End of Con. Rod Bearing = 18 x 24 x 14.8

Little End of Con. Rod Bearing = 14 x 18 x 17.2

Crankshaft Bearing = 25 x 52 x 15
 

 



OPENING ANGLES



TOLERANCES


  Exhaust 174 degrees 1 degree
  Of exhaust ports/ducts 174 degrees 1 degree

LIST OF ACCESSORIES INCLUDED


  Centrifugal clutch
  Carburetor with butterfly - 27
  Electric starter
  Exhaust with flex

MATERIAL

  Cylinder ALLOY
  Connecting rod FORGED STEEL
  Crankshaft FORGED STEEL
  Head ALLOY
  Liner CAST IRON
  Crankcase ALLOY
  Piston ALLOY
  Piston ring CAST STEEL

CYLINDER DEVELOPEMENT



     0.20 mm ON ALL CAST MEASUREMENT

 B - 65.3 mm

 C1=C2 -26mm

 C3 - 29.4 mm
 Angular readings by inserting    a 0.20 mm guage

 E - 33.5 mm

 F - 43 mm

 G - 43 mm


CYLINDER SECTION



CYLINDER BASE



CYLINDER HEAD AND THE COMBUSTION CHAMBER



 Combustion Chamber Volume = 10 cc
Tolerance = 0.5 cc



CRANKSHAFT




 Complete Weight = 1975 grams
 Tolerance = 10 grams


INTERIOR VIEW OF THE SUMP




PISTON





 Weight - 135 grams ( 5 grams tolerance)


CONNECTING ROD



 Weight - 100 grams ( 5 grams tolerance)


IGNITION

  MANUFACTURER:

OPPAMA
  MODEL NUMBER:

PRD/OPPAMA/2004
  ROTATION:

A/CLOCKWISE
  DESCRIPTION:

CDI

PHOTO OF IGNITION



PHOTO OF COIL







 


CARBURETOR DIMENSION




 A - 33.75 mm
 ( 0.20mm tolerance)


 B ---------------
     -----------

 C - 24.0 mm
 ( 0.10 mm tolerance)


 D - 24.0 mm
 ( 0.10 mm tolerance)


 E - 27.0 mm
 ( 0.10 mm tolerance)


 F - 66.25 mm
 ( 0.10 mm tolerance)



DRAWING OF THE SILENCER AND IT'S COMPONENTS




 The end parts of the silencer must have two soldered pairs of lugs (one pair at the top and one pair at the bottom) to allow for fixing of seals by the Organizer so that the silencer may be opened during the competition,.

 Measurements:

 A - 100 mm

 B - 54 mm

 C - 3 mm

 D - 170 mm

 E - 315 mm

 F - 170 mm

 G - 21 mm

 H - 135 mm

 I - 455 mm

 ( 0.50 TOLERANCE ON ALL MEASURMENTS)


DRAWING OF THE SILENCER





CLUTCH DESCRIPTION AND PARTS SKETCH


Weights:

A - 416 grams

B - 48 grams/1pc

C - 356 grams

(Tolerance = 5 grams)

For ordering info contact Doug Huggler at doug@prdfireball.com

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