So, I put a set of SLP twins on my sled, along with the recomended Slp head (12-530 domes, to lower static compression) And it won't rev past 6 grand on the stand. I had the sled running pretty well last year with the Hot Seat single, and all I did was add the twins, and head. I've checked the carbs, reeds, compression (105 both sides) checked the pipes, and can for obstructions, lowered the jetting from SLP's recommended 520N to 450. By that time I was most of the way thru a box of beer, and then I noticed the broken fuel tank neck........ What a great weekend. I had the box reprogramed by Hot Seat, to remove the DET 2 years ago. Anyone have any bright ideas?