Ripping into the bike I quickly figured out why he had lost tension and the bike stalled. The main shaft bearing had exploded, so the front sprocket was essentially hovering on there with just the chain tension holding it on. Now this bearing sat right in the middle of the case halves, so to replace it I would have to rebuild the engine. No big deal, I've done it before, but if I'm going to be doing that much work, I wanted to see how I could get some more power out of the engine. I looked around a bit and heard whispers of people in the UK putting an ‘86/’87 Yamaha FZR1000 motor in the FZX. Not a whole lot of documentation out there, just basically said that the FZR and FZX share the same mounts. The rest I'd have to figure out, but this just got fun!