Savard 05 wrote on 04/24/24 at 03:46:19:Those are stock size jets I'm using in my s40 ID say maybe the carb setup being wrong had something to do with it running rich on mine I just messed with idle speed and air valve 2 1/2 turns out and my plug was nice tan color with those same jets.
The needle on mine was assembled incorrectly and setup rich. I’m fairly confident that’s the cause of my rich condition.
FYI - the 47.5 pilot jet is for older models that also had idle jets. Newer models use a 52.5 as stock and don’t have the extra idle jets. The 145 main is stock for newer models, but the older models used a 155 main jet.
I’m rebuilding the carb with a 52.5 pilot, 150 main, and I’ll be setting up the needle closer to the middle (move the clip up and lean out the midrange). See my other post about the needle and white spacer location for more details. Hopefully I can get it right (or close) on the first try so I don’t have to repeatedly tinker with it to get it right.