I have 2010 Sj that had less than 3 hours on ski when we installed a Dasa SS865 with an epic ignition, b pipe, 49mm Full spectrums and boysened reed set up. Motor has 175 psi compression running 93 pump fuel.
I put an hour meter on the ski with the new motor. I have put 2 hours on the motor over the last few weeks basically trying to jet the thing. The ski would hit hard from idle but if you rolled the throttle on or cruised at low speed, it was really crappy. It seemed really rich. I assumed I had the pop off wrong. Ski never ran right 0-1/3 throttle unless you just nailed it. As I am trying different pop off pressures with no real success, it started dying like others have described. When this happened 3-4 times I tried the second timing curve provided with the epic and ski ran for about 5 min and it died again. This time when I restarted, the motor ran like crap throughout entire rpm. I tried switching back to first timing curve and still runs like crap throughout the rpm range.
I am going to either try my stock ignition or an enhancer to see if it cures the problem. After reading this thread, I think I have been spinning my wheels trying to jet this motor over an ignition problem.