RE: os 91 surpass cam bearing removal
This week I helped a friend remove the cam bearings from a Magnum 91 4-stroke, which is essentially a copy of the OS 91. The bearings in the cam cover came out with heat only, simply by heating them up, placing the assembly inside a 5/8" socket and tapping on wood.
The cam bearing in the crankcase was another story. I tried the grease trick and it was not viscous enough (too thin) and simply came through the bearing. Then i tried the wax tricked and it worked! So thanks for the wax tip! I filled the ID of the bearing with wax chips and used a transfer punch that was as close to the ID of the bearing and packed the wax in by gently tapping. By refilling the ID with wax as I worked it in, eventually the bearing popped out.
Hope this helps!
Mark