Hi guys,
I'am having a problem with an MDS 78. It's only had maybe 1/2 gal. of fuel run through it, runs fine at full throttle, runs for a few seconds at 1/2 throttle and then dies. Its sluggish on transion from closed to full throttle. It also seems that the compression is low, doesn't have much resistance when flipping the prop, [ my OS 40 LA has more]. It doesn't really draw fuel when you open the throttle and choke it. I'am using the H9 super plug that came with this engine, using Sig 15% Champion fuel, any suggestions?