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Author Topic: CB750 rat bike?  (Read 5648 times)

Offline teazer

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Re: CB750 rat bike?
« Reply #10 on: Sep 15, 2018, 11:18:27 »
Those look like Koni rear shocks.

Good catch.  Alloy bodied Konis.  They will need to be rebuilt to work properly.  Not sure what sort of "oil" they used to fill them, but it's like wax that separates out and clogs the valves.

Offline pidjones

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Re: CB750 rat bike?
« Reply #11 on: Sep 15, 2018, 14:09:38 »
Those look like Koni rear shocks.
Yep, they are. Looking at the C addendums, the forks might be from one, but.... the axle doesn't thread into the left leg, it has a nut on the left end. Also, the right side of the axle is rou d with a hole. Maybe someone modified the left fork leg?
"Love 'em all.... Let God sort 'em out!"

Offline pidjones

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Re: CB750 rat bike?
« Reply #12 on: Sep 15, 2018, 14:29:08 »
Don't have the tool to pull the rotor from the crankshaft and clean behind it/chuck it and polish the slip rings on the lathe. Don't have the steel to make one right now either (I probably will, later). So, went from 220 through 2000 grit cleaning corrosion and polishing the rings. Ohmed out the stator (.4 ohms each leg, 4.6 meg to ground) and rotor (4.4 ohms). I don't know where the mild continuity to ground on the stator is from. I cleaned it pretty well, even stuck it in the sink for scrubbing and after blowing it out with the compressor, baked it a little with the heat gun. There has been a lot of water in there. There was a poorly patched hole in the bottom of the stator cover from an accident. I dug their JB Weld out and replaced it with my own. I'll need to replace a lot of screws for the covers (Ace is the place). Next is to set valves and then check out the electrics, change the oil, and check compression.
"Love 'em all.... Let God sort 'em out!"

Offline teazer

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Re: CB750 rat bike?
« Reply #13 on: Sep 15, 2018, 14:59:41 »
rotor pullers are simple tools. Bolt it in as tight as possible then whack it on the end with a BHF and it should pop off in your hand.  Look around at the Honda axles you have around, one of them is sure to fit.

Offline pidjones

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Re: CB750 rat bike?
« Reply #14 on: Sep 15, 2018, 15:10:39 »
Just don't have a 20mm 1.5 pitch around. I'll cut one on the lathe as soon as I find the steel to do it with.
Anyway, here are some before pictures of the stator and rotor. Like the "patina"? Also a picture of the fuse box. The electrics will be almost as much fun as the Hunley. At least it has fewer connections.
« Last Edit: Sep 15, 2018, 15:13:46 by pidjones »
"Love 'em all.... Let God sort 'em out!"

Offline trek97

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Re: CB750 rat bike?
« Reply #15 on: Sep 15, 2018, 20:55:13 »
Glad to see you pulled the trigger.

Offline pidjones

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Re: CB750 rat bike?
« Reply #16 on: Sep 16, 2018, 18:50:32 »
Shazbot! Measured valve clearances. They range from 0 to 12 thousnths, with four at .0025 and two at .006. I've ordered the Motion Pro tool so the shims can be plucked, measured, and new ones ordered where I can't swap. Oh well, gives me time to go through the wiring, I guess.--------
1-------------2--------------3-----------4
 E  .0025/.0025----.004/.006------.006/.012---.004/.0025
 I   .0025/.004----<.0015/.003----.004/.0045--.004/.003 (all in inches)
« Last Edit: Oct 16, 2018, 12:45:46 by pidjones »
"Love 'em all.... Let God sort 'em out!"

Offline trek97

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Re: CB750 rat bike?
« Reply #17 on: Sep 16, 2018, 20:17:55 »
Shazbot! Measured valve clearances. They range from 0 to 12 thousnths, with four at .0025 and two at .006. I've ordered the Motion Pro tool so the shims can be plucked, measured, and new ones ordered where I can't swap. Oh well, gives me time to go through the wiring, I guess.

I haven't even checked mine yet.    ::)

Offline SquidHunter

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Re: CB750 rat bike?
« Reply #18 on: Sep 16, 2018, 21:37:52 »
Chuck the whole electrical system in the can. Chasing gremlins on these bikes is no laughing matter...




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Offline pidjones

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Re: CB750 rat bike?
« Reply #19 on: Sep 16, 2018, 21:49:03 »
Chuck the whole electrical system in the can. Chasing gremlins on these bikes is no laughing matter..
After a GL1000 that had been under water, I'm kind of looking forward to it. The charging system on these is a lot more like an automotive system controlling the field excitation than the GoldWing permanent magnet alternator and regulator that shunts excess to ground. We shall see....
"Love 'em all.... Let God sort 'em out!"