I am having trouble tuning my 3.3 because it seems to get leaner after a bit of running and I have already tested for a air leak but there is not one. So do any of you nitro gods know whats going on?
It is natural for it to lean out as the fuel level gets low: what can compress: air or liquid? Tune at a half tank and when the engine is warm. Otherwise you'll have a good tune at a full tank and too lean at empty.
The Super Derecho