Case Splitting newbie

Heat/cool

I use the method REELRAZOR and GORR use. I made an aluminum slug that fits in the mainbearing. Heat the slug with a torch (only takes a minute or so). I have the crank in the freezer for a couple hours. It drops right in the bearing (any) so far. Also I use air impact to remove the clutch nut and even the Yamaha book recommends a piece of aluminum between gears to retorque. Works for me. The only special tools I use is a puller for the electrical side (about $15) and a std flat bar puller for the case ($10). I do have access to a hydraulic press which makes mains a quickie but again the heat/cool works too.

You can chuck the crank in a lathe. Mount the rod on a bungee cord, and lightly slip fit the crank to bearing interface. Fingers work fine with 400 grit and oil. Sneak up on the correct fit, if you go to far the crank could be junk. After this process no worry with the crank/bearing process. The motor will rev a little better.