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Posted

Afternoon all unfortunately the kit failed it’s mot last week one of which was emissions the co failed at I think around 4.7 when it has to be under 3.5

its been stood over a year for various reasons and it’s running r1 carbs. When it was set up by Bogg brothers I think it was 2.8 or something. 
 

I’ve cleaned the carbs and put new plugs in and slightly turned the air fuel mixture screws for idle. Sadly as it has no mot i can’t drive it to get them set up and the mot garage won’t touch the carbs. I’m back in the morning for a retest and just wondered as it’s unburnt fuel causing the issue would increasing the idle speed help at all along with me already lowering the a/f mixture screws or would the increase in revs create more vacuum and jn return pull more fuel anyway? Thanks all

Posted

i would suggest leaving it running on the drive for a little bit ensure that anything that is unburnt is either burnt or ejected. For my MOT (i have a superspec with Rover engine) to get it through emissions has to run hot so make sure its arrived just in time for the MOT with the engine already at temperature. 

 

IN other words let it get nice and toasty before it goes in

Posted (edited)

On your V5c what emission limits are stated? Mine has nothing so I think should be just a visible smoke test. Sometimes my mot place take a reading and tell me off as it’s too lean, but on my sheet it says the limit is 4.5 for CO. Not 3.5 I’ve got R1 carbs, mains are 1.7 but not sure on the idles, I should put bigger ones in.

its a pinto btw.

Edited by Peter Bell
Posted

I’ll have a look but I’m sure it’s 3.5 as i only did the Iva in 2018. 

Posted

My 2B has just passed its MOT on a visible smoke test only as no values are recorded on the V5. 

I am running a 2litre SOHC with 38DGAS carb.

Posted

Have you got air filters on the carbs?  If you have I'd make sure they're clean, or better still, I'd leave them off for the MOT.

Posted

I’m going to check the v5 in the morning but I’m 99% certain it’s listed on there. 
 

I do I have a pipercross px600 filter I did think about leaving it off to allow as much air into them as possible 

Posted

This shows the 4.5 max  requirement but I don't know where it's from.

I think there used to be an emission flow chart on here somewhere or on the NW Hoodies site, from Big Jim.

emissions.jpg

Posted
  • 5 weeks later...

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