I've been busy with the engine transplant into the 129 this weekend. Wednesday I got the block from the 125 back from the machine shop, and built it up yesterday, to the point that I had it painted. Things went together well, the usual issues with dings on the crankshaft and finding everything, one thing I did was to install studs to make it easier to remove the muffler cover without having to disturb the head bolts by installing studs. With the head bolts in, but not tightend, I found that configuration didn't work with the tall head bolt bosses on the 125's head. Using the blower housing from the 125 gave me an issue with mounting the coil, as one of the mounting bolts was missing. I decided to sleep on it,
Today I hit it again. After contemplating things while doing some light work in the vineyard this morning, I decided to use a self tapping screw to deal with the coil mounting problem, but for the head, I decided to use the head off the 129 engine, which was also in pretty good shape, and is stud friendly. With the motor configured the way I wanted it, it was time to pull the motor from the 129. Once the motor was out, I noticed that the bronze PTO wear button was badly worn, likely due to a torn up mating button. The fiber button on the 125 was barely worn, and since I was using the 125 PTO clutch, I decided to carefully liberate it from the 125 chassis. Liberating the bronze button from the 129 was a whole different story, and included drills, a dremel, and a whole lot of hammering and heating. As darkness fell I was finally ready to drop the newly rebuilt engine in. I got the new engine in the chassis, and the old engine on the stand for its teardown, and decided to call it a night. A couple more hours work and I should be ready to try her out. With what I have laying around, I might be able to put a decent 10 horse motor together with a good block/piston/crankshaft, using some parts from the 12 horse 129 motor to make the 125 a viable backup tractor for me.