Topic: CB750 K0-1

[Don R]

 I hear that. The brake on this frame was stuck so rather than repair it, I chose another nice brake panel from the box of several. I think the lever is better than one of my K0 bikes but there are a couple more nice ones and one that's clearly shorter and has a recessed area in the casting. I'm not sure if that's a performance modification or not but it would make less leverage when you stomp the stop pedal, so harder to lock up?

[BenelliSEI]

I think that might be a K1 pedal? After that they have the threaded tab for the return “stopper” bolt.

[Don R]

  I'll have to compare my pedals, I removed one with a return stop tab thinking one without must be correct. I always used the 69 for reference, even before I owned it. 
 
  The bike had a later axle adjuster on the right side, I had bought a pair of solid ones and then found the missing one, so it went on. There was a nice chrome axle spacer in the axle/pedal tote, it's going on the Rat Race. I got the rear brake light switch bracket back into shape out and put on, wired the switch and found a good spring. The front turn signals are on I need to put some cover on the gauge wires and tuck them into the headlight bucket.
 I'm getting close to a roll-out for pics and listing it for sale. There's a K3 up on the shelf but it's reserved for my old age project. L0L.

[BenelliSEI]

Don….. here’s a good shot of what’s on my ‘69. Confident it’s the original. It just bumps up against the right footpeg.

[Don R]

   I think I already swapped it shortly after the pic was taken. It was nice and warm today and I want to get the lift cleaned off for two engine projects. It's a roller now.
  This is an original K1 seat, I also have a nice K2 seat and a new old stock one on my brothers K4. I'll likely get some form of K0 seat on it soon.

[BenelliSEI]

I sold a K1 in that shape a few years ago! Going to complete or move it along?

[Don R]

 I'm considering getting an engine together and adding one of my Busso exhausts to it. That said I'd be tickled to sell it with those items unassembled.
 What's a roller like that worth?

 My thought on the seat is buy an ebay 70/71 foam, under $110 delivered, add the ducktail padding from my old red foam and my K0 repro cover and build it on the K0 seat pan. I coated it with rust killer and am going to paint it to see how good it can appear. 
 I'm tempted to do another 836 and a Tiger Eye Pearl Brown K2 paint job on a tank and trim and just sell something else. The problem is, my painter went a little goofy and then moved away.

[Don R]

 I have the bottom engine case re-cleaned and pre-assembled. I checked the transmission  and put in the neutral safety switch. It needs new main bearings, so I'll swap them out and check with plastigauge. The crank and rods came out of another engine, they look new.
 Tonight, I printed out the bolt diagram for the top and bottom and wrote in the bolt sizes.
  That will help on the big motor later on when I add the crank studs and Yamaha acorn washers.
  There's a really nice cylinder and pistons on the shelf, they were on a sandcast crankcase so had been rebuilt. I'll run the hone through it and pop on stock rings. Unfortunately the matching head is a k5 and would look wrong, I'm going to check the early heads and see if there's a good one ready to use.

[Don R]

 It's funny how the more finished a bike gets the more you get attached to it. At first, I just wanted to hang correct parts on a naked frame so someone might want to finish it. I found quite a few items on ebay and some in my totes to make it a proper K0 roller. Now I've swapped better internals into the original engine cases and started thinking about making it run and getting it painted.  It has a K1 seat and gauges, but with a 71 title maybe I can live with that.

[BenelliSEI]

I pulled a K0 type battery box, coils and wiring harness off of a factory replacement parts frame on the big shelf. The blinker rubber is intact but like always, the fuse holder tab is ripped off.
 This virus I've had for a week is finally letting up a little so I can do some decent shop time.

The little finds are the best! On my Sandcast, the blinker and the rubber band were intact and to my surprise it worked! The single fuse box was a mess, but the one from vintagecb750.com is identical and an easy sub.

Do you know if the “black top” shocks from Yamiya have 5 preload settings or 3? I sent them the question but they never answered.

[Don R]

 I don't know about Yamiya, I'd guess they are correct. My Diecast's shocks came from Z1, I forget if it was Parts or Enterprises. They look really correct except the 5 way adjusters. I have a set of 3 position adjusters pulled from a set of bent up shocks but haven't gotten back to that bike yet. 
 Today I cleaned and fitted up the top case, I'm ready to check bearings and seal things up. It's surprising how much the trans shafts need to be bumped back and forth to line up the bearing locators. I spent an hour looking for a bearing locator, there should be plenty of spares but I might need to find more later.

[MauiK3]

I usually get good response from Yamiya, I'd try again.

[BenelliSEI]

I usually get good response from Yamiya, I'd try again.

Will try again.

[Don R]

 I spent all day locating a bearing retainer, The last transmission shaft that I had in the box had the one still in a bearing. I put an 1/8" steel shim under the cam chain tensioner spring. I had lost the rubber oil galley plug behind the shift cover when I pressure washed the block last winter and took the one out of a weld repaired case. I think that was the last usable part from that engine's crankcase.
 The low mile motor that the crankshaft came out of had all green bearings also and they looked good so they got swapped in with the crank. I think it's ready for sealer and crank bolts. I had new shaft seals in stock so maybe tomorrow I'll bust out the Hondabond.
 If I can get this engine assembled and back in the frame, I'll start on the Rat Race engine's updates and the turbo motor's crankcase assembly.

[newday777]

Don that sounds like progress.
It's good to be a hoarder at times like this, needing the rubber plug in that weld repaired case that you have held on to.
I too am a hoarder, when offered free/low outlay parts, motors and parts bikes........ but I definitely have a storage problem......

[Don R]

 I forgot to mention and give credit, Per gave me a heads up about the rubber plug blowing out while pressure washing. I'm just sure I would have noticed when I put the shifter parts back in. Maybe. L0L!

[Don R]

 The cases are bolted up and the shifter is assembled. I remembered I want to re-torque the crank bolts and re-check rotating torque. I only had one early shift side engine cover so I used it here, none of the other engines left to build care if there's a shift pattern on them. I used my cycle X good shim gasket then I found a stock one. fudge.

[BenelliSEI]

If you need another “no numbers” cover, I mysteriously have a few extra!

[Don R]

 Thanks John! I think my early motors are all now supplied since I traded the turbo bike's shifter for this one. I have spare K0 clutch covers because I was going to weld up some to make 9-hole covers.
  I re-torqued the mains and cleaned up an oil pump, no matter what I do, it gets tight when I re-assemble it, so I got out the spare pumps and picked out a clean one.  I didn't find enough pump O-rings so there's that too.