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Verfügbare Sprachen
Verfügbare Sprachen
Gas tester (part no. 343265)
If the exhaust pipe has a curved inlet it may be necessary to slightly bend the metal exhaust probe
to give better fit. This should be done very carefully using slight bends in several places rather than
a single big bend in order not to kink the pipe. FULL INSERTION IS ESSENTIAL FOR ACCURATE READ-
INGS Engine fuel systems are usually designed so that the mixture automatically becomes weaker
at speeds above idle, except under rapid acceleration when the mixture is enriched.
Gastester is designed to work at engine tick-over speeds; however it will also give a reliable reading at
higher engine speeds. VIOLENT FULL THROTTLE ACCELERATION TO HIGH ENGINE SPEED SHOULD BE
AVOIDED WHILE THE PROBE IS IN THE EXHAUST PIPE AS THE PULSE PUMP DIAPHRAGM AND PROBE
PIPE MAY SUFFER DAMAGE IN EXTREME CIRCUMSTANCES. To test mixture weakening at higher RPM,
increase the engine speed in increments of approximately 300 RPM to 400 RPM up to a maximum
of 2500 rpm, observing the reading between each adjustment. (Remember that the instrument may
take 15 seconds to respond to a particular adjustment.
The CO level should fall progressively and stay low during a gradual increase in speed. The mixture
enrichment for acceleration (accelerator pump/air valve damper) can be tested by rapid opening
and immediate release of the accelerator. Opening to half throttle should be sufficient.
Within a few seconds of this operation the Gastester CO indication should increase before returning
to its previous setting. The degree of increase will vary according to how this procedure is carried
out and also with the type of fuel system. A fixed choke carburettor with accelerator pump will usually
give a more pronounced increase than a variable choke carburettor or fuel injection system.
Use only a 12 volt car battery in good condition as power supply. A faulty or flat car battery may
not be able to supply adequate current to the instrument (Gastester Professional draws about 0.8
amps), resulting in errors in use and difficulty in calibration.
Gunson's Colortune
Allows you to see the colour of com-
bustion in your cylinders. The kit in-
cludes a special glass topped spark
plug and a reflective viewing system
for difficult plug locations
standard thread
14 x 1,25 . . . . . . . part no. 19831
Adaptor
10 mm . . . . . . . . part no. 477803
12 mm . . . . . . . . . part no. 477804
18 mm . . . . . . . . . part no. 477805
10 mm for Motorcycles
specially designed electrode
(high compression) part no. 366878
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