Fig. 2
Spark plug with washer
removed & sensor in its
proper position
12
Install the spark plug finger tight to hold the sensor in position. Finish tightening
with a plug wrench to the same torque as normally recommended. Do not allow
the sensor to turn as you tighten the plug. The sensor is easily damaged if forced
into a cooling fin.
Route the sensor cable from the motor to the instrument. Secure the cable to the
frame of the kart with cable ties. Connect to the small, threaded pigtail on the
instrument and turn the connector until tight.
EGT Sensor Installation
Our standard EGT sensor is a type K thermocouple temperature sensor. Install
the sensor clamp assembly, or weld on, to the exhaust header. Position the clamp
so that the sensor will be in the center of the header and approximately 2˝ from
the head side of the exhaust flange. Using the fitting on the clamp assembly as
a drill bushing, drill a 3/16˝ hole through the header. Remove the clamp assembly
from the header and redrill the hole to 13/64˝. Reinstall the clamp assembly and
align it with the hole just drilled.
Insert the sensor into the fitting so that the tip of the sensor extends 1/4˝ past the
center of the header. Tighten the compression nut to lock it in place. (see Fig. 3)
Connect the black wire to any clean, unpainted metal surface on the engine (it is
important that this is a good electrical connection).
CHT Sensor Installation
Our standard CHT sensor is for air cooled engines only. For temperatures
consistently above 450˚F we have a thermocouple type sensor.
Remove the spark plug from the cylinder you wish to monitor and discard the
plug washer. (see Fig. 2) Check the surface of the head around the spark plug hole
for a smooth, flat finish to assure a good seal when the sensor is installed.
Position the sensor over the spark plug hole and check that you have sufficient
clearance around the outside of the sensor body to avoid damage when the plug
is installed and tightened. This may require some minor machining on some
installations.
