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ITEM

CR 125CC

Fuel
AvGas (preferable) or Premium Unleaded
Oil
Castor/Synthetic Kart Oil
Fuel/Oil ration
20:1
Jetting
Normal range of jets for a Keihin 38mm PWM carburetor...
  • 160 - 180 main
  • 52 - 58 pilot
  • DGJ-DGK-DGL or CGJ-CGK-CGL needle
 Spark Plug
 NGK BR10EIX, NGK BR10EGV
Tyre pressures (cold – in shade)
8 PSI - MG Yellows
12PSI - MG Reds
Front wheel spacers
20mm each side
Front wheel nut tension
Should be able to turn spacers with fingers
Camber
+2 mm
Wheel Alignment
+1 mm out
Rear Wheels
1385mm
Water Temperature
Max 8,000 RPM until engine water temperature is greater than 45C.  Ideal temp 55C. Max Temp 75C
  
Run in procedure
 RPM Range
1st Session of 10 minutes
5,000 – 7,000 RPM
2nd Session of 10 minutes
5,000 -  8,000 RPM

Continually change the revs over the range specified in the table above.  

Allow the engine to rest for 5 – 10 minutes between each session.

Check all nut and bolt tension at the end of run-in

During the run-in period, excess fuel may accumulate in the air intake airbox.  Smoke will also be seen from the exhaust.  This is normal when engines are run at low revs.  The spark plug may foul due to excess oil in the engine.  Change plug if engine does not start.

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