Can't pass emmision test!

[tempebru]

Thanks for the input. I'm going to lean her out and drop the idle and try again. I've owned this bike since 1980 and have always had to have it tested. It has always passed before with the same setup ( pipe & pods). It is still a "fresh" motor but I've got almost 100 miles on it to get the rings to seat. I have only changed the fuel needle setting so that is where I'll start. I'll also reset the idle air screws and recheck the sync (I still have my mercury filled carb sticks from back in the day!).They only test for HC and CO not NOx on bikes so I'm lucky on that point. And I have to agree that the smell a "Big Twin" emits makes me wonder how they pass.

 

[GS1100ez]

i cant imagine testing the bikes
i cant even get my 94 jeep to pass the first time, or the second, or even the 5th

and my 73 2 stroke kawasaki would never pass thats crazy

 

[82Shafty]

High carbon monoxide (CO) emissions are a telltale sign of a rich fuel mixture. On older carbureted vehicles, fuel-saturated plastic floats, incorrect float settings, leaky power valves and misadjusted chokes are often responsible for the rich mixture. On newer vehicles with feedback fuel controls and fuel injection, leaky injectors, excessive fuel pressure and sluggish or contaminated O2 sensors are all possibilities to investigate.

http://www.aa1car.com/library/2000/ic60032.htm

If you just have to pass an idle test, lean her out some more. But not to the point of misfiring...Misfiring sends HC's through the roof.

Could also get a set of hotter plugs just for emissions testing.

Like someone else mentioned; relay mod.

Replace your resister caps if they are old.

Increase float height levels if you absolutely have to

Fresh oil--- I have seen contaminated oil cause several cars to fail.

I had my Dad's 71 c-10 5.7 v-8 pick up only emitting 140 something ppm HC's when it was allowed 900 ppm. The guy got cat spotting mirrors out and looked underneath it for cats because he couldn't believe how clean it ran. I had simply dialed it in with a vacuum gauge.

 

[doctorgonzo]

I'd also think 100 miles is VERY borderline as far as the new rings being as seated as they are gonna get.

 

[bwringer]

The guy got cat spotting mirrors out and looked underneath it for cats because he couldn't believe how clean it ran. I had simply dialed it in with a vacuum gauge.

Cat spotting mirrors? :lol:

 

[GregT]

100 mls is very low I agree to bed in chrome top rings - about 500 - 700 mls should see compression nos. max out
You are running a mineral oil to bed the rings in, yes ?
If they have not bedded I would expect the worst emissions at high vacuum - ie, idle, just as you quote.

As an aside, are you using the same fuel as you have previously ?
If this is the first time through the test using an Ethanol blend you can expect to do some tuning to get it passing

Greg T

Cat spotting mirrors ? - I've got a dog needs a couple of those !

 

[tkent02]

I'd also think 100 miles is VERY borderline as far as the new rings being as seated as they are gonna get.

That probably depends on the miles, pussyfooting around or running it hard will make a huge difference. Sounds like it's mostly been idling for the sniffers, about as hard on a new engine as you can get.
But yeah, even ridden properly, 100 miles is not a whole lot.

 

[tempebru]

I'd also think 100 miles is VERY borderline as far as the new rings being as seated as they are gonna get.

I agree that 100 miles won't have the rings fully seated, but I don't think that is the cause of my problem. I had an old Jeep in '85 that burned a quart of oil every 200 miles and smoked like a forest fire but always passed.

 

[tempebru]

i cant imagine testing the bikes
i cant even get my 94 jeep to pass the first time, or the second, or even the 5th

and my 73 2 stroke kawasaki would never pass thats crazy

As crazy as it sounds, I also own a 1984 RZ 350 2 stroke that is ported and running Toomey pipes but I got it to pass!

 

[tempebru]

That probably depends on the miles, pussyfooting around or running it hard will make a huge difference. Sounds like it's mostly been idling for the sniffers, about as hard on a new engine as you can get.
But yeah, even ridden properly, 100 miles is not a whole lot.

I've done the break-in as I've done on all my bikes and cars that I've built. Hard acceleration and chop throttle, repeat at various speeds and gears and try not to ride at a constant speed and or throttle position for any length of time. The only time she sits and idles is after a warm up ride so that I can sync and adjust the carbs. It's hard to get a lot of miles in for break-in when she doesn't have registration!!!

 

[tempebru]

Update!

Update!

Thanks to everyone for their input! I set the fuel jet screws at 3/4 out, air screws at 1 1/4 out, resync'd the carbs, set idle speed to 1000rpm's and passed with HC at 425ppm on a 1800ppm limit and CO came in at 3.28% on a 5.50% limit!!!!! Now I can finally get her registered and out on the open road!

 

[67fire]

Hallelujah!!! Now, go have some d*mn FUN!!!

Eric

 

[mighty13d]

GREAT! Time for some serious miles now!

 

[midnightcafe]

never living in Arizona! That's a ridiculous mandate, there were no emission controls in 1967!

 

[1980GS1000E]

CA has zero smog tests for bikes. Arizona is wacked on that point.

 

[Guest]

what? Im definately never moving to that state. .

But you can get a pot script in AZ.