Ok, here is my dilemma. I failed my no ppm on 25/25 and no ppm on my 50/15, all the the other categories were perfect. Here are the numbers in its entirety.

25/25- Reading - Allowed 50/15- Reading - Allowed
HC ppm- 22 - 132 pass/ 20 - 136 pass
CO%- 0.03 - 0.73 pass/ 0.02 - 0.76 pass
NO ppm- 1734 - 945 fail / 1232 - 1045 fail
RPM- 2384 - 3000 max / 1807 - 3000 max
CO+CO2%- 14.5 - 6.0 min / 13.7 - 6.0 min
Gas Cap passed

Any suggestions? Thanks