AZ Emissions: Tricks to Passing via OMR

Old Man Rock wrote: Hey all,

Just a few things/tips on a true story to help others pass these damn AZ emissions testing...

As most of you know, I had major engine melt down where a whole shit load of aluminum dust was sucked into my CR specials thus complete tear down and clean of the carbs was required...

I expected to fail the first pass through emissions to see where she layed but twice... Hmmm, something not right...

Standards @ Idle:
Hydrocarbons: 1800
Carbon Monoxide: 5.50

First two attempts failed... ~ 6.4 over the 5.5 cut off for carbon, hydro measurements was in spec.
Hmmm... Always a PITA for I can get it to idle, and run lean but with no choke help, bitch to start....

While in the office after the second attempt, I asked the attendant behind the counter can I PLEASE see in writing where I'm not allowed to use my choke to start the bike for the test... Your techs keep demanding this but.... give it to me in writing.

Of course he looked at me as if I was from friggin Neptune.... :blink: Off he goes to get his supervisor. I explain the situation to him where the techs in the bays say I'm not allowed to use choke to start and this is an idle test after all on a 30 year old air cooled carbed engine, no computer to assist.

He replies, yes, you can use your choke to start but once started, it has to idle on it's own. I say fine, I fully understand that part and agree to that... See you Monday for re-testing.... :evil:

While going through the old girl again found that my charging was under par... During second test plugs where only getting ~ 11.8Vdc so at 2-3Vdc under spec, oh hell ya that will make a significant difference in the spark/combustion chamber.

Taking notes and DVM measurements came to the conclusion the frame (not engine) ground conductor I used was under rated due to the AFR current demands for heating the O2 sensor... 6 AWG should work just fine... :whistle: Yeah, yeah I know over kill but what I had left and worked just fine, 13.1 to 14.5Vdc throughout rpm ranges, all good....


So here's the tricks....

NOTE: First let me say the engine timing, ignition timing, valve clearances, charging system, carb sync etc... has to be in spec/operational.

1) Use low Octane full and only have ~ 1/3 tank, no more.
2) Use a hotter spark plug, in my case B7ES.
3) Set your idle higher then normal, ~ 1800rpm.
NOTE: This will be need because you'll be running leaner and the assholes partially block your tail pipe for exhaust flow.
4) Set your pilots leaner ~ 1/4 to 1/2 turn... CR specials this is CCW.

Luv the new AFR gauge....
As can reviewed in the below image, passed well below the 5.5 cutoff @ 3.87... :woohoo:

Once back home, use the Color Tune, put the B8ES sparkies in, Sync Carb and adjust idle....
Once I get out for a good run, I'll make some tweaks for 13.8 to 14.1 while @ cruising speeds.

Good for another year....

Hope this helps someone else out...

OMR