We get about one day a week this time of year that is flyable. Yesterday was the day and I made another CO test.

When I built my EX I exit Ed the airframe using a bulkhead type fitting. There was a bit of a gap around these fittings and the aluminum V-shaped belly pan. I put some white duct tape around these.

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Originally I made some white kydex coins to go over the aileron penetration holes and glued them in place using Polyfiber glue. I noticed the coin on the left side had pulled lose on the front and was oily. That indicated to me that some exhaust flow was moving past the cable (which was also oily). My breather is on the left side. So I cleaned and re-glued the kydex piece.

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One or both of these fixes lowered the CO numbers but I still have CO present in single digits and in a descent with flaps it still rises into the 20 PPM range.

Better but not cured yet.