Failed emissions. Again.

Still high on the hydrocarbons!

I've replaced all fuel lines, vacuum lines and filters. I corrected the shim size for the exhaust on cyl2.  I've replaced plugs and air filter. I've changed the oil and filter.

What else could cause high hydrocarbons? The bike itself seems to run just fine.

really high, or just slightly high? how about your 02 and nox (if they test for nox in your state)  knowing the exact numbers vs. what they want you to have can actually help diagnose your problem, did they give you a copy?

Report is as follows :

Hydrocarbons ( in ppm ) :
 1st  Idle - 456
 Precond Reading - 700
 Precond Standard - 100
 Final Reading - 408
 Idle Standard - 220   ( So 408 / 220. I'd say really high? )

Fail.

Carbon Monoxide ( in % ):
 1st  Idle - 0.86
 Precond Reading - 3.06
 Precond Standard - 0.50
 Final Reading - 0.92
 Idle Standard - 1.20

Pass.

Put tape over the sensor
or
turn down the pilot mix screws so that it will just barely idle while hot.

take it in and it should be able to pass with flying colors.

actually 100o or better would be really high. (really high would mean unburnt gas is exiting the cylinder)

just guessing, it looks like your getting a partial burn, not a full detonation in one of your cylinders that's why your HC is slightly high, and your CO is slightly low..
recheck valve adjustment, or maybe a carbon buildup on top of a valve giving a poor flow maybe
spark plugs are new, i assume gap was checked so no probs there,

how bout trying a top end cleaner? just run it thru the carbs and see if it helps....
i suppose you can cheat and turn the mix screws down, but actually finding the prob might help the bike run better anyway

That's the other thing I did.

I took apart the carbs and bathed them in carb cleaner. Also checked float heights.

I checked and rechecked all 4 valves when I was doing them. Only one was off and that was exhaust#2.

Could it possible be a failing ignition coil not producing a strong enough spark?

cleaning the carbs doesn't get the valves any cleaner...

but, you might be on to something with the coil suggestion.... usually, though, a weak coil gets worse when its hotter, yet your HC count was as bad on initial reading as at the end of the test... still could be, but I think you would feel a performace loss after riding a bit, if this were the case

still cant belive emissions on small cc bikes, or any bike for that matter.  i did hear somewhere that CA, required emissions on lawn mowers, is this true or is my chain getting yanked?

CA doesn't require emmissions on anything other than cars... IMHO its the most fricking lenient state in the country for bikes... Liability Insurance is cheapest there (OK OK maybe the second cheapest... but its low) and traffic laws and HOV useage and eveything is very bike biased... I guess they'd rather keep cars off the roads and parking lots and clogging up bridges and tunnels and highway's... so they do anyhting to make that work. There are parts of the state where they wont give you a licence to open a car wrecking yard, but will give you a bike wrecking yard license... hence I know of some car yards that are actually licensed as bike yards... Should have reported those jokers... after I sold the triumph spitfire ... but they did help out with that.
Cool.
Srinath.

I am sooooo glad I don't live in a "metro" area where they do this stupid testing. I agree that testing bikes, which beat anything but hybrid cars in mileage, is just wrong. I'm also surprised the left coast doesn't emission test bikes and yet Arizona (Phx & Tucson) does. :dunno:

Quote from: cummuterguycleaning the carbs doesn't get the valves any cleaner...

but, you might be on to something with the coil suggestion.... usually, though, a weak coil gets worse when its hotter, yet your HC count was as bad on initial reading as at the end of the test... still could be, but I think you would feel a performace loss after riding a bit, if this were the case

Might be a coil after all then...

I rode it into work today  ( about 20 miles ) and some of that is freeway...

The bike started bogging down on the freeway and wouldn't do more than 60mph...

Coils?
On another note... what octane are you running? I'm putting 91 in there now... Too high?

And on another other note... My oil light is constantly on when the revs are under about 2500... I just did the oil change ( 3 quarts ) and the oil level on the dipstick looks good... What could be causing this?

Master, as far as oil pressure, you may have a relief valve going bad but I would just check the sending unit and see if it is ok. You can check actual oil pressure on the right side below the timing ignition cover. You might try a lower octane for your tests, the lower octane will burn faster and may help on combustion. Or you may have a bad coil, plug wire, or even an intake lake can cause that HC problem too. Is compression good in both cylinders? Hope you get it straightened out. Wish I could ride, lovin' the forum.

C.......

Not sure on the compression.

Wouldn't an intake leak cause it to run lean?

Me and a friend are leaning towards the coils at this point.

Actually an intake leak can cause high HC and low CO, although it is unusual. Just because the mixture is lean doesn't necessarily mean what fuel you have is going to be burned. Love the bike and the forum.

C.......

So it bogged down on the freeway again today...( but ran fine all the way home last night  :dunno: )

Get to work, put it in neutral, lean it over on the stand and rap it out...

Ooooooo, look at all the pretty smoke...   Oh yeah, and it appears my exhaust can has a leak too  :x