Author Topic: CB750 K4 Build - The Cafe Tracer (Read 121377 times)

budman · « **Reply #225 on:** February 24, 2016, 02:33:32 PM »

Just need to bend them.

mystic_1 · « **Reply #226 on:** February 24, 2016, 06:17:01 PM »

Say, you may have already thought of this, but once you have the top end off of the motor, you need to invert it in order to unbolt the crankcase halves, and then lift the bottom of the case off, leaving most of the internals in the top half of the crankcase.

I've never seen anyone design an engine stand adapter that allows this to happen, since most people support the motor from the lower mounting bolts. On the bench you just rest the cases at an angle supported by the upper rear mounting bolt boss at the rear, and the top of the studs at the front. This actually puts things at a convenient angle for working on, too, imho.

Anyway, i do like your bracket design, you could probably run the motor on the stand with those things and do your initial setup and re-torquing on the stand before dropping the motor back into the frame. Wish I had access to a waterjet!

mystic_1

budman · « **Reply #227 on:** February 24, 2016, 07:14:22 PM »

I haven't thought of any of that. I've never cracked open a CB750 engine and haven't gotten that far in the manuals. I just wanted something stable that I could paint around.

The brackets were cut on a plasma table.

Bootsey · « **Reply #228 on:** February 24, 2016, 07:37:16 PM »

That is one damn fine looking roller, nice work!

budman · « **Reply #229 on:** February 25, 2016, 05:53:00 AM »

Quote from: Bootsey on February 24, 2016, 07:37:16 PM

That is one damn fine looking roller, nice work!

Thanks.

mystic_1 · « **Reply #230 on:** February 25, 2016, 06:12:50 AM »

Quote from: budman on February 24, 2016, 07:14:22 PM

The brackets were cut on a plasma table.

Mmm even better, the idea of using the "fourth state of matter" (the things stars are made of) to cut and shape steel (iron is created inside stars) has always seemed poetic to me.

Do you know which paint you'll be using yet? Got a color scheme in mind for the tins yet? I assume rally stripes of some kind to go along with the seat cowl.

mystic_1

budman · « **Reply #231 on:** February 25, 2016, 06:52:58 AM »

Quote from: mystic_1 on February 25, 2016, 06:12:50 AM

Do you know which paint you'll be using yet? Got a color scheme in mind for the tins yet? I assume rally stripes of some kind to go along with the seat cowl.

The tank will be Toyota Sunset Bronze Mica. The stripes will be a light tan color to match the stripes on the seat cowl. I'll also have the logos I designed on the sides of the tank buried under the clear. It will take several rounds of spraying clear coat and sanding to fill in the wood grain on seat cowl. In between rounds of clear I think I'm going to mask off the stripes and dust the walnut with some thinned down Bronze paint to mimic the shimmer the tank will have. Not too much. I want the wood grain to show through. It won't be an exact match to the tank, but it should still look cool.

budman · « **Reply #232 on:** February 27, 2016, 12:27:17 PM »

All I need now is another pair of arms and another back.

mystic_1 · « **Reply #233 on:** February 27, 2016, 05:00:14 PM »

Nice, you could sell those.

Oh hey, I bet if you ever did need to, you could unbolt the bottom and pivot the motor onto it's back, and it looks like the studs would land somewhere in the vicinity of the engine stand connection, so you probably COULD rebuild the bottom end in that stand, just make up a little rest for the studs to land on.

mystic_1

budman · « **Reply #234 on:** February 28, 2016, 07:32:15 AM »

I was talking to a friend about that. It would need a little more R&D. I designed these brackets to fit my el cheapo Harbor Freight stand. There's a bunch of different style stands out there. Would probably have to include adapters.

SOHC4 Cafe Racer Fan · « **Reply #235 on:** February 28, 2016, 07:42:01 AM »

Considering MANY of us have the El Cheapo Harbor Freight stand, that's a good idea. You could just focus on that model.

budman · « **Reply #236 on:** February 28, 2016, 12:41:20 PM »

With the help of my teenage son we were able to mount the engine on the stand. Feels pretty stable. I might start tearing it down a little bit later on.

SOHC4 Cafe Racer Fan · « **Reply #237 on:** February 28, 2016, 07:47:47 PM »

Crank those mounts out for your fellow members and make some money for parts.

mystic_1 · « **Reply #238 on:** February 28, 2016, 07:52:19 PM »

^^^
This

Looking good. I'm wondering though if you couldn't skip the lower front mount and just hang the motor from the upper and lower rear mounts. Would save you a lot of material, and I think I've seen other people do it that way before.

Your current design, though, would also double as a bench stand.

Just some random thoughts.

mystic_1

budman · « **Reply #239 on:** February 28, 2016, 08:41:34 PM »

Quote from: mystic_1 on February 28, 2016, 07:52:19 PM

^^^
This

Looking good. I'm wondering though if you couldn't skip the lower front mount and just hang the motor from the upper and lower rear mounts. Would save you a lot of material, and I think I've seen other people do it that way before.

Your current design, though, would also double as a bench stand.

Just some random thoughts.

mystic_1

I've seen other rear mount versions others came up with and it just seemed to me there was a lot of stress there. I mentioned in post #233 that my brackets could be used as a bench to stand.

budman · « **Reply #240 on:** February 28, 2016, 08:50:27 PM »

Quote from: CB750 Cafe Racer Fan on February 28, 2016, 07:47:47 PM

Crank those mounts out for your fellow members and make some money for parts.

I have a spare set. One of the hole slots is off on one of them. It can be drilled or reamed out and welded back up so it'll work. The other bracket has an ugly slot, but it should still work. If you want it you can have it if you cover the shipping. You would have to cut your own spacers.

budman · « **Reply #241 on:** February 29, 2016, 05:41:12 PM »

My tank and side cover decals arrived today.

budman · « **Reply #242 on:** March 05, 2016, 02:13:58 PM »

Had to make a clutch basket nut removal tool out of 21mm socket. Worked great.

budman · « **Reply #243 on:** March 06, 2016, 07:20:16 PM »

I've got the engine pretty much as torn down as I want to take it. It looks like it's in really good shape. Doesn't appear to have any extensive work done to it previously. The no. 2 intake tappet adjustment screw appears to have been replaced at some point. There was a tiny washer in the no. 2 cylinder, but it looks like it may have been dropped in there recently. The engine didn't have spark plugs, carbs or an exhaust when I got it. The no. 3 exhaust valve looks a little burnt compared to the rest. Might have been running rich on that cylinder. The Pistons look good. I thought the engine looked untouched until I got to the cylinder base gasket. There's some scrape marks and what looks like old gasket sealant on the case. Other than that I don't think I can complain.

mystic_1 · « **Reply #244 on:** March 06, 2016, 07:30:23 PM »

Looking good, that cam chain tensioner has seen some miles for sure.

Nice job on the clutch locknut tool.

How were the bores?

mystic_1

budman · « **Reply #245 on:** March 06, 2016, 07:47:16 PM »

Quote from: mystic_1 on March 06, 2016, 07:30:23 PM

Looking good, that cam chain tensioner has seen some miles for sure.

Nice job on the clutch locknut tool.

How were the bores?

mystic_1

No scrapes, gouges, burning or cracks. A little shiny, but a quick hone is all I think it needs.

Stev-o · « **Reply #246 on:** March 07, 2016, 06:54:06 AM »

Motor looks pretty clean, Bud. Plan to paint? Color??

budman · « **Reply #247 on:** March 07, 2016, 07:54:59 AM »

Quote from: Stev-o on March 07, 2016, 06:54:06 AM

Motor looks pretty clean, Bud. Plan to paint? Color??

Yep. Black or dark charcoal grey cases (probably black) silver cylinders, black head and chrome covers. I don't want to spend a lot of time polishing aluminum.

Thanks for your help yesterday.

Stev-o · « **Reply #248 on:** March 07, 2016, 02:41:51 PM »

Quote from: budman on March 07, 2016, 07:54:59 AM

Quote from: Stev-o on March 07, 2016, 06:54:06 AM
Motor looks pretty clean, Bud. Plan to paint? Color??

Yep. Black or dark charcoal grey cases (probably black) silver cylinders, black head and chrome covers. I don't want to spend a lot of time polishing aluminum.

Thanks for your help yesterday.

Anytime...

budman · « **Reply #249 on:** March 10, 2016, 03:34:37 PM »

I dug out the leftover hunk of cow that I used to cover the seat on my bobber and it looks like I have just enough to do the CB750 seat.

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Author Topic: CB750 K4 Build - The Cafe Tracer (Read 121377 times)