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)