If the engine dies at medium speeds, close the metering needle one mark or more.
Always remember the position of your needles before changing the setting. It will allow you
to easily go back to the previous setting. Usually, 2 to 4 tanks are enough to complete the
break-in procedure. This short break-in time is due to the unique CRF technology.
Warning:
Run-in temperature is 90°C (194°F) to 100°C (212°F). Between tanks, allow the engine
to cool down to 40°C (104°F) before making the next run.
• To stop your engine, return to idle. With a rag or plug, block the tuned pipe exhaust.
The engine will stop.
Final Adjustment
When the engine break-in is finished, you can proceed to the final adjustment.
• Top speed adjustment consists of running on the longest straight and observing maximum
speed. Return to the beginning of the straight, close the main needle one mark, and observe
the difference in top speed.
• Continue run after run, closing the main needle step by step, trying to achieve the highest
top speed. However, if the main needle is closed too much, the engine will overheat and
less exhaust smoke will be visible. The car will lose speed. If you reach this point,
immediately re-open the main needle one mark or more. Be sure to allow the engine to
cool to 40°C (104°F) before continuing.
• After finding a desirable top speed adjustment, it is time to find the low speed setting. With
the engine running, close the throttle and stay at idle position for about five seconds. Then
pull the throttle wide open. If the smoke coming out of the tuned pipe is excessive, and the
car accelerates slowly, the idle mixture is too rich.
• To adjust, turn the metering needle clockwise one mark. Repeat this operation until the
acceleration from a 5 second idle is good, without excessive smoke.
• If the engine tends to speed up momentarily, and then cuts out abruptly when the throttle is
opened, the low speed mixture is too lean. Correct this by turning the metering needle
counter-clockwise one or two marks. Repeat the test until it accelerates well without the
throttle cutting out.
• Adjustments are very important. You will need a lot of time and patience. They must be
done under actual running conditions, until the engine responds quickly and positively
to the throttle control.
• Always make adjustments while at the operating temperature of 105°C (221°F) to 125°C
(257°F). Drive until this temperature is achieved before attempting any adjustments.
Warning!
Adjustments must always be made under load, on the track. The clutch adjustment is
a major factor that will influence the engine's adjustment. Make sure that the clutch
engages properly at the correct RPM to allow the engine to reach adequate RPM to
deliver its power.