CB750 Makeover Cafe Style

Yet again it was an amazing evening this evening. Just warm enough to break a sweat but not hot enough to swim in it. Got some more done on the bike in general this evening. Removed the valves which proved trickier than I had in mind. The friend whom I borrowed the valve spring compressor for works on cars, I was hoping for something that reached around the head and clamped on the face of the valve....this was not that kind, oh well he tried. Anywho I did get them off with a 5/8 socket and a quick rap from my nylon hammer (the only soft hammer I own, which is used for gun building.) The number 3 and 4 valves proved to be the worst with 3 being the better of the two. Number 4 had a massive step in the guide and was very hard to remove.

After the head was tore down completely minus the guides and the 4 studs that hold the cam tower in place I did hone out one cylinder. I cleaned up about 90% of the surface with there still being a ring at the top and a smaller ring at the bottom with some non cleanup in between the two. Tomorrow or the next day I will bring it in to work and measure it with a bore gauge and find out if I'll have to bore over or not. I really would hate to hone these things out to the very top of tolerance but with all the money into parts I'm going to need already if I do have to go over it could push the build back a little while pending funds.

Next up were the front forks. They were nicer than expected, surface rust of course but I don't think it's beyond repair! Someday I'll get around to polishing them up along with the lowers as well. i will replace with progressive springs and rebuild both the front and rear stock suspension. After messing around with the forks for quite some time I decided it was time to remove the triple tree. Proved quite easy actually, and I'm glad I did those bearings needed a replacing bad. Nothing major but they weren't pretty that's for sure. We also removed the rear swing arm this evening as well. I stepped back and seen it, a bare frame, I got excited for a moment, then I remembered just how much work was left. Taking it apart was the easy part, and cheap too!

Well there you have it, another stinking novel, pictures to follow. Ya'll have a g'night.

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Well no real major updates. Welded nuts onto the studs and it worked until I snapped a portion of the stud. So now the only other option is to drill them out to just over the minor diameter and pick the left over threads out by hand. If I don't so that then id have to tear into the 77 and steal those cases or buy used. That blows. Bike 23 yeti 0.

I did do some cutting on the frame however which cheered me up a bit until I realized I left my ear plugs at work. I cut off all the tabs and mostly grount down. I also cut the bottom and side kickstand off. Have yet to bend up a rear hoop but hopefully this week I'll get it done.

I also have plans to mock up an oil tank by switching back and forth from the bare frame and the still assembled 77.

I checked tolerances on the bore that I had honed which had approximately 97 percent cleanup or so and the bore measured 2.4025. That's one tenth over tolerance from the factory. I believe the serviceable limit was 2.4055. So I still have three thousandths to work with though I won't go that far. Taper I was right at about three tenths which I didn't think was bad. I'll have to check so see what the limit was on that as well.

I'm really debating on just buying a tank. I don't have a 75 tank and I think they look much better than the 77 and later tanks. I seen on eBay I could buy a rusty pile of junk for a Buck fifty but hell I can buy a new fiberglass tank for 400. Not really sure what to do there either.

Heres a good question how does one go about cleaning the dome on the head without messing up the surfaced portion of the head?
 
Not much got accomplished this weekend. Finished grinding smooth most of the tabs on the frame. Made an excellent dinner for my daughters and I. I also started another project as I needed something quiet to do while the girls napped, call me crazy but I'm going to go for it, hell if nothing else it was free as I had everything laying in the rafters of the garage. :D

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The plan is to stretch the tank a bit, just a tish under normal width, egg it out a bit and add knee indents as well as clip on indents. That's the plan anyways, if it doesn't turn out, oh well.
 
Looks like the stud is well broken? I would have welded (still might) a bolt and nut to it, the very high welding heat often will break the rust/corrosion bond and allow the bolt or stud to leave home. Probably the best penetrating fluid it automatic trans fluid and acetone mixed 50/50. I hate easy outs they hardly ever work for me.
Cheers, 50gary
 
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