Gunson G4125 Digital Gas Tester Compact Portable Tool ( No Filters To Change )
Item Description

Gastester is used for the testing and setting of all carburettors (petrol, leaded or unleaded) and petrol injection systems on any vehicle. Gastester provides a simple and inexpensive method of showing when the correct petrol/air mixture is being dispensed

  • Content includes: Gas tester instrument including
  • Calibrates in air, no moving parts to wear out
  • No filters to change
  • Accurate to 0.5% C.O measurement at 15-25?C
  • Instructions included
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 of the exhaust probe is essential for accurate readings.
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. However, violent
full throttle action to high engine speeds should be avoided while the probe is inserted in the exhaust pipe; the
pulse pump diaphragm can be damaged 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.

Order Payments 

Payment methods : Cash on collection,Paypal,Debit / Credit Card over the telephone 

About Us 

Repairing vehicles is our business with 50+ years experience we feel well accomplished to trade within the automotive sector as a supplier of tools & garage equipment. Most suppliers of automotive equipment & tools do just that and only that.,This is where our business has the advantage over our competitors.
We carry large stocks for immediate supply, Having our own up to date vehicle workshop and bodyshop we have a wealth of experience & skill to advise on any questions we are asked from technical data to how an item may work.

Shipping

We dispatch items within 24/48 working hours of the order being processed. We keep all our stock levels as accurate as possible but as we sell on multiple platforms sometimes there may be errors that lead us to not having stock of your item, if this happens we will work with you to resolve this as quickly as possible
We use Royal Mail for most packages under 10kg for the UK  dependant on size, All UK parcels have full door to door tracking , 
We have a choice of courier services that we can use upto 150kg Normal UK Delivery is 2-3 working day delivery after dispatch

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