C O .025

Just had the bus MOT 'd all good apart from a very lean CO reading . It runs a 2 ltr with twin webbers , any hints on the ideal CO reading ?

 

What year is it?

 

2016

 

Hi, 1979 .

 

Just off down the pub for a couple of pints of Doom . really appreciate your help guys .

 

Mimes 0.62. 2ltr FI.

 

How do you mime that?
You must be a champion a charades.

 

Have 6 pints and you won't care about van. Glad to help.

 

I would have it at 2 to 3 %

 

If you set it up so it runs right it will pass. They're good on emissions, I've never had one fail.

 

I know the jets are correct it was put on a rolling road and set a couple of years ago . The CO was at 2.5 at last years MOT , since then it has had some carb cleaner put in . I just wanted a guide on the CO as I am more than aware they do not like to run lean .

 

Maybe this is just a change of units? .025 is the same as 2.5%. Have you asked the MOT station?

 

The idle mix screw provides a fuel air mix at idle only. It bleeds in below the throttle plate. However it's set, the moment you have any throttle at all, the jet itself takes over.

 

Very easy to set. Screw in until engine stumbles, slowly unscrew a bit at a time. When your last little unscrew makes no difference, screw it back in that last bit.

 

Cheers, thanks for your help . If it ever stops raining down here I will get to the beach and have a play .