So purchased a yamaha from my father last year, it's just been used on farms. After troubleshooting the 4x4 I've found the front drive shaft is shot. No splines on the engine side of the shaft. I've got the shaft removed, but for the life of me can not get the coupler off the engine side. I've read here about a nut that hold it, I've not seen a nut on the inside or outside. It's just a flanged coupler. Not to mention I have no idea what year it is, only symbol is a grizzly roaring on the front of the information center, which is just lights no lcd screen. Anyway back to the question, is there a retaining ring somewhere that holds it on? Before I start beating on it?