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Author Topic: CB750 rat bike?  (Read 5470 times)

Offline SquidHunter

  • Posts: 93
Re: CB750 rat bike?
« Reply #20 on: Sep 16, 2018, 21:56:53 »
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....

I put a shunt system on mine. A lot easier to deal with. It stays in the 90s here until October, so I was only getting about a year out of the charging system.
If your harness looks bad chuck and replace the whole thing. Itís a pretty cheap replacement. Since youíve experienced the gold wing wiring, you already know Honda over complicates the crap out of their electrical.


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Offline pidjones

  • Posts: 609
Re: CB750 rat bike?
« Reply #21 on: Sep 17, 2018, 08:37:02 »
For those running a shunt type regulator (permanent magnet alternator), let me caution you to NOT rely on the spade connectors for the "three yellow wires". Pull them out of the connector, do a very good solder splice, and cover them with a shrink tube (I like the marine type that Harbor Freight sells with hot glue inside). This joint has been the downfall of many a GL1000, 1100, and 1200. The stator output sees all of the output all of the time on a shunt system, and any oxidation leads to overheating, plastic connector body melting, and eventual shorting of the output which takes out the stator rapidly. I guess it is such a point of emphasis on a GoldWing because the engine has to be pulled to get the stator out.
"Love 'em all.... Let God sort 'em out!"

Offline irk miller

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Re: CB750 rat bike?
« Reply #22 on: Sep 17, 2018, 09:21:51 »
I re-wire all of mine and do away with that connector.  Rick's has a write-up about the signal wire on these, which is the cause of the issue, iirc.

Offline pidjones

  • Posts: 609
More fun!
« Reply #23 on: Sep 17, 2018, 11:50:38 »
Pulled the front calipers off today and they are headed to the bin. Both pistons frozen SOLID (can't turn with good large channel locks). These look to be CB750F calipers on home-made adapters to the C forks. SO, why not replace with C calipers and dual pistons? Found a pair on ebay already and inquiring if he will combine shipping.
Have the headlight apart and all of the connectors separated. Don't look as bad as the Hunley did, and most are the newer, smaller connections. I'll clean all of them, clean up the handle switches, clean the ignition switch, and splice the main power wire that had a broken crappy spice near the headstock. I don't really mind working on the electrics.
I hate brakes. At least I didn't get brake fluid everywhere, because the system was BONE DRY! All that came out was rust dust. Already have a Chinabay master and I' plan to clean the splitter and buy new lines.
"Love 'em all.... Let God sort 'em out!"

Offline SquidHunter

  • Posts: 93
Re: CB750 rat bike?
« Reply #24 on: Sep 17, 2018, 23:28:59 »
I put dual pistons on the front of mine, with steel braided lines. Pretty sure they are off of an 82 or 83 900. They bolted right up. Only thing I donít like is the wicked nose dive if I break too hard.


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Offline pidjones

  • Posts: 609
Re: CB750 rat bike?
« Reply #25 on: Sep 19, 2018, 00:03:36 »
Today the battery got its acid and charge. Reworked the remaining electrical connections, repaired a burnt out fuse position (#1), installed a bypass fuse holder to replace the 30 Amp dogbone. The shim removal tool came in this afternoon, so I was able to pull and measure them all and will work out swap/purchases tomorrow. Last thing was to hook up the battery and a quick test of lights on the dash and tail light with key on, and bump the starter. Tomorrow I hope to get as far as a preliminary compression test. I know clearances are off, but it should reveal major (VERY low compression) issues.
"Love 'em all.... Let God sort 'em out!"

Offline pidjones

  • Posts: 609
Re: CB750 rat bike?
« Reply #26 on: Sep 19, 2018, 14:33:07 »
Shims on order, oil and filter changed (photo to come), and initial compression test done. MUCH better than I had feared. Was afraid there would be some ~20 psi or even Zero. Lowest dry was 90 psi, but they all went to over 150 with a squirt of oil, which has me hopeful for rings needing loosened up. Pretty amazing considering the spread in valve clearances. Starter cranked happily with no refurb needed. The outboard valve cover bolts had been swapped for standard bolts, so new ones are on order and the inboard bolts all now have new gaskets. BTW, in case it is new to anyone, the trick to geting new gaskets on the bolts undamaged is to soak them in HOT water for about five minutes, then the bolts pop right through them.

.
And here is the promised photo. Anybody? Bueller?
« Last Edit: Sep 19, 2018, 19:02:58 by pidjones »
"Love 'em all.... Let God sort 'em out!"

Offline pidjones

  • Posts: 609
Re: CB750 rat bike?
« Reply #27 on: Sep 20, 2018, 08:06:54 »
Still chasing down what forks they are. CB750 uses 35mm, right? Shoul not have assumed that. Last night I measured (three times). They are 36mm. So, that opens the field a LOT.
"Love 'em all.... Let God sort 'em out!"

Offline The Jimbonaut

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Re: CB750 rat bike?
« Reply #28 on: Sep 20, 2018, 10:04:14 »
Howdy - not sure what the question is regarding the oil filter housing, but there should be an o-ring in the groove that runs around the outer perimeter.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline irk miller

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Re: CB750 rat bike?
« Reply #29 on: Sep 20, 2018, 12:43:18 »
I convert mine with the Randakk standard filter kit and run Wix filters.