Mk1 DX Engine in T25 Camper - Co2 level?

[bmouthboyo]

I have just been out and reset it to what I think is 2% but I had to adjust it blind earlier after it wouldn't start post MOT.

To be honest turning the adjustment screw doesn't make a drastic difference, and going by others saying small turns clockwise will increase richness it is no where near that sensitive. I managed to get it up to 3% and was running well, but revving it gave a little bit of smoke so put it to just over 2%.

However when I took the tester out and let sit in air it settled on 2.5% so according to manual means it may have been 0.6 less than I thought. Not exactly an art.

Also the RPM screw is at low as it will go, and as i don't have rev meter had to kinda do it by ear which was lowest setting.

I still have no idea why the MOT said it was 0.12%? That must be near impossible on a 24 year old K jet engine stuck in a van!

I am not using my Gastester wrong am I and should be going 2% above the initial calibrating 2% from air?

[mwep201081]

I have just been out and reset it to what I think is 2% but I had to adjust it blind earlier after it wouldn't start post MOT.

To be honest turning the adjustment screw doesn't make a drastic difference, and going by others saying small turns clockwise will increase richness it is no where near that sensitive. I managed to get it up to 3% and was running well, but revving it gave a little bit of smoke so put it to just over 2%.

However when I took the tester out and let sit in air it settled on 2.5% so according to manual means it may have been 0.6 less than I thought. Not exactly an art.

Also the RPM screw is at low as it will go, and as i don't have rev meter had to kinda do it by ear which was lowest setting.

I still have no idea why the MOT said it was 0.12%? That must be near impossible on a 24 year old K jet engine stuck in a van!

I am not using my Gastester wrong am I and should be going 2% above the initial calibrating 2% from air?

take it somewhere proper and get it set up by someone who knows what they are doing. tune up usually costs me 25-35 quid, which you'll save in fuel, especially in a bus, in no time!!