87 raider won't pass emissions
pollutant
HC standard 3.0 reading 1.40
CO standard 25.00 reading 40.55 fail
NOX standard 4.55 reading 1.44
the solex mikuni was totally rebuilt by a reputable firm two years ago and all electronic features work. Had some trouble getting it to pass two years ago right after the rebuild and put a new cat converter on it and passed. any way to lean this thing out a little. this is the fourth test and on one with some tweaking i got the CO down to 25.71 but still a fail. the result shown is with a low tank of gas and a pint of denatured alcohol in the mix. also the advance is up to 12 degrees BTDC. does advance create more CO? can i change the jets? i need to lean it out just a little i think but don't know how. i think the only air fuel mix screw is for the idle only. correct me if i'm wrong. will a new cat help? this test is good for two years. i can put a new cat on pass the test and pull it for the next time if i have to. thanks
paul