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Now the engine is running and idling on the stand. There should be a lot of smoke from the ex-
haust as the engine is warming up. This is normal. Also the rear wheels should be turning ena-
bling the water pump to pump coolant through the cooling system.
Tuning the carburetor on the stand under NO LOAD is not valid for the track. By turning the LOW
SPEED carburetor jet in ½ a turn (to a total of 1 turn or slightly less) you will fi nd the engine will
run smoother and may increase in RPM. This is tuning on the carburetor under no load will NOT
work whilst driving, as the engine requires to run richer under the load of acceleration. If you try
and drive the kart with the carburetor this lean the engine will not accelerate off the mark.
Once you have warmed up the engine, examine the engine and the rest of the kart for any leaks,
check the brakes, steering and generally inspect the kart is ready for use.
NEW ENGINE ONLY – RUN IN PROCEEDURE
The run in procedure is simple. The fuel oil ratio and the carburetor tuning is as per standard set-
tings. The supplied B9ES basic spark plug is ok for running in and will help burn the excess oil
from low speed running.
1.
For the fi rst 10 minutes do not run the engine above 70% power. Accelerate at 100% but
do not let the kart reach maximum speed. As soon as the kart hits the power band (sud-
den acceleration point- approximately at 8,000- 9,000 rpm) give it 1 or 2 seconds of pow-
er, then brake to slow the kart to approximately 15 km ph. Repeat this over and over for
the fi rst session. It’s like you are stopping and starting without reaching top speed.
2.
Fully inspect the engine and kart for anything that may have worked loose and let the kart
cool for 10 minutes.
4.
After inspection do a second session this time to 11,000 – 12,000 rpm for 10 minutes then
brake to slow the kart to approximately 15 km ph. Repeat this over and over for the fi rst
session
5.
Fully inspect the engine and kart for anything that may have worked loose and let the kart
cool for 10 minutes.
6.
Last session 90% full power put DO NOT HOLD maximum rpm. Try and peak the rpm at
14,500. After completing another 10 minute session inspect.
7.
Change the spark plug to the correct heat range to suit the outside temperature of the day
and then go for it.
