[mikiec]

Here in AZ we have emissions testing. I used to work for those folks for about 12 years.

What we found out is that high hydrocarbon (HHC) numbers usually were a function of ignition. Ie: bad wire, timing off, engine problems, etc....

High CO numbers will cause the HHC to climb. However the CO numbers must be real rich to have any effect on HHC. In the order of 6 to 8%.

Carb idle circuits, air fuel mixture scews, being out of balance could also cause high HHC readings. This applies at idle only.

Mike