Not sure about this sled but generally...Check the resistance on both the new and old coils and the stator. The old and new coil resistance should be in the same ballpark. You will need to know the tolerances to accurately test them. I have had coils and stators test fine until the sled has been run a bit. Test both cold (room temp) and warm, letting the sled sit at idle might not get it warm enough. I generally have spare CDI's or coils to swap and will buy a used coil from a reputable seller either locally or on Ebay before I pull a flywheel. Electrical problems often times require the mundane process of elimination and its usually something simple, like a poor connector or bad ground. I had a Bearcat that was driving me nuts and it turned out to be a loose connection where the CDI plugs into the coils. It looked fine, I must have missed it a half dozen times when I was inspecting the connectors. I only found it because it was dark and I saw it arc inside the connection when I shook the harness. Are you shutting the sled down with a key or kill switch? Try both.