Measuring Instruments Gunson G4125 Handbook. Gunson claim accuracy for the Gunson of +/-0.5% CO but mine seems to be 0.9% out. Related Manuals for Gunson Gastester G4125. I adjusted the idle mixtures to give a Gunson result of 1.9% which is within the factory range of 0.7% to 1.5% if I deduct 0.9%. Two years ago the Gunson was 0.9% out from the Lotus MOT results. So both out by 0.9% from MOT. I then tested my BMW E36 which had 0.02% CO at MOT idle test but Gunson gave 0.9%. Find great deals for GUNSONS Gastester Mk2 Complete With Instructions. I calibrated the Gunson in the air at 2.0 and followed all the instructions. I calibrated the Gunson in the air at 2.0% and followed all the instructions. I decided to use a digital Gunson Gastester (some years old) to see.

I decided to use a digital Gunson Gastester (some years old) to see if I could increase CO to within the factory range. The MOT numbers for CO at 2000rpm is too low at 0.124% to 0.265% which could be causing the high HC.įirstly I used the Carbtune Pro manometer to test balance of the carbs but none was needed (very simple to use). GUNSONS GASTESTER MK2 with all accessories & manual- excellent condition. It sometimes fails the idle test on high HC but passes the test at 2000rpm. GUNSONS GASTESTER PROFESSIONAL Exhaust CO Gas & Engine Analyser - 148.00. Easy to assemble for use - sample pipe is surprisingly short Started using it, readings compared well to my old Crypton Motorscope, but within a few minutes the sticky pads holding the pulse pump to the casing started to unstick, then the pulse pump failed. I always have problems with the MOT emissions idle test for my 1986 Lotus Esprit S3. Gunsons Gas Tester Professional Manual Pdf.

Gunson gastester mk2 manual