Despite my lack of updates lately I have been working on the engine rebuild. I did get my newly undercut gears back from CycleX. I've reassembled the main and counter shafts. One thing to note here is that the snap rings on the shafts do have to be put on correctly. It's hard to see but outer edge is sloped and one side has a sharp edge and the other is a bit rounder. They have to be put on so the edge opposite the moving gear is the sharp edge. Without taking care here, there is a possibility that the ring can pop out and cause all sorts of havoc. Of course every thing is cleaned and assembled with assembly lube.
As far as the top end, I picked up a 836 kit pretty cheap on ebay. Plus a new cam chain, gasket kit, and a bigbore mls head gasket from CycleX. Oh yeah, and I used my cb750supply gift certificate for a seal set. I took the jugs to a local shop for the bore. I started on the valves. Disassembling and cleaning. I took a dremel to the intake and exhaust ports, not a full port job, just a little smoothing out of the casting defects. When I got to the valves I found the guides to be in really good shape, but the seats were badly pitted. The bike must have sat for many years with some of the valves open. I tride to give them a good lapping, but they were too far gone.
So today I took my head to the local shop to have them recut the valves. Well they can grind them, but don't have the equipment to cut them. On top of that my jugs were still on the shelf. So I asked who around town could do the work. They suggested a machine shop in Grand Rapids. So I took the jugs and head to that place. The machinists there said my jugs wouldn't fit in his machine. So again asked where to go. They suggest I call the local Honda dealer, who inturn suggest a shop that's closed for the season. Who would have thought finding a machine shop to do the work in west Michigan would be so hard. Fox Motorsports was about a mile away, they sell and service Kawasakis, Yamahas and Moto Guzies. I thought I'd pop in and see what they say. As it turns out a guy in their shop who used to own his own machine shop does side work. He's going to do all the work and for a good price. $65 a hole for the bore and $125 for the valves seats. He'll also inspect and redeck if needed.
So I'm almost ready to button up the lower end.
I found a good youtube series. The channel is called Hackaweek. The guy has a series in progress assembling a 73 cb750. Good stuff.
