I am new to the forum and could really use some help. I got a good deal recently on a Big Bear with no spark. I have spent a lot of time diagnosing it and I believe I have traced the problem back to the CDI. Now my problem is that I am having a VERY hard time finding a CDI for this wheeler. The 1987 Big Bear has a different part numbers than the the newer years such as the 1990-1994 big bear. The 90-94 (OEM part #3HN-85540-10-00) is easy to find a replacement for, used or aftermarket. But for the 87 (OEM part #1YW-85540-20-00) I cannot seem to find either and aftermarket or a used cdi! So I have a couple questions. Does anyone know for sure if the 90-94 CDI would work on the 87? Does anyone know where to buy one for an 87? or have one of their own for sale? Any help would be appreciated!