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Author Topic: CB750 rat bike?  (Read 9479 times)

Offline pidjones

  • Posts: 885
Re: CB750 rat bike?
« Reply #100 on: Dec 22, 2018, 14:13:38 »
Honestly, I need to stay away from this bike for a while. But, parts are supposed to be in this afternoon, so....  Good thing, too because I decided to check that J cap in an F position. They had jambed screws in the cross-drilled supply holes in the cap, and RTVed the bolt holes. And of course, broke one of the cap bolts off. I was able to remove the broken bit with little drama, then spent time picking out RTV.  Bolts are supposed to be included with the caps I bought, so hopefully things will get better.
"Love 'em all.... Let God sort 'em out!"

Offline pidjones

  • Posts: 885
Re: CB750 rat bike?
« Reply #101 on: Dec 22, 2018, 20:38:35 »
Swapped in new (used) F and L caps after first Plastgage testing them - both between .003 and .004 inch. Measured with both cylinders on respective side with lobes away from lifters. Final assesmbly with assembly lube on the bearing surfaces. New chain came in too, but it will wait for tomorrow or Monday for installation. Good weather forecast for next week, so hopefully there will be a chance to run it through the gears to make sure that is all fit.
"Love 'em all.... Let God sort 'em out!"

Offline pidjones

  • Posts: 885
Re: CB750 rat bike?
« Reply #102 on: Dec 27, 2018, 14:10:41 »
Chain is now mounted. Rolled it out this morning, hooked up the aux fuel cell with ~ 1/2 liter real gasoline, and fired it up. Once warmed enough to take off the choke I ran it through all 5 gears (on center stand). Clutch engages/disengages well, all gears work and sound pretty good (chain is hitting the plastic chain guard some, so need to adjust that). Then shut it off and hooked up the mercury sticks (old MotionPro unit). Balanced the carbs, lowered idle, balanced again. Have not touched pilot screws - all set at 3 turns open. Aircut valves are disabled.

Guess the next thing other than fixing the seat rear cowl assembly is tires (ouch$$). Thinking maybe getting a bunch of wrecked Honda plastic from the dealer and gluing it together to patch the existing cowl assembly now that I've pried 3 pounds of Bondo off of it..
"Love 'em all.... Let God sort 'em out!"

Offline pidjones

  • Posts: 885
Re: CB750 rat bike?
« Reply #103 on: Dec 28, 2018, 11:49:06 »
Ordered new Kenda 657s for the '79 CB750F rat bike. Not in a hurry for them, as it will be a couple months before decent riding weather, and I have a showw in a couple weeks to get the GL1000 ready for, plus rides scheduled for the GL1800 (weather permitting).
"Love 'em all.... Let God sort 'em out!"

Offline pidjones

  • Posts: 885
Re: CB750 rat bike?
« Reply #104 on: Jan 19, 2019, 11:12:47 »
The Kendas are mounted and wheels back on. That's about as far as the weather and my health could take her this week. Came down with a cold that knocked me out until yesterday, when I went to the funeral of a high school classmate and then to see a cousin in a nursing home that is not doing well at all. I still need to drain the fuel from the tank into my waste gas jug to get rid of the fogging oil and storage spray grease that I'd put in the tank and never flushed out. I'm sure that is a major cause of the smoke that she displayed before, because she doesn't smoke on the auxiliary tank. The weather has turned its typical East Tennessee January/February crud. Maybe the middle of next week it will settle and I can at least try to ride around the neighborhood.
"Love 'em all.... Let God sort 'em out!"

Offline trek97

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Re: CB750 rat bike?
« Reply #105 on: Jan 19, 2019, 18:21:32 »
Wow, I think just about everyone, including myself, have turned into Hermits.

Hunkered down in garage, trying to tinker the foul weather away.

Good to hear you're still moving right along.  I put Kendas on Rachels Hondamatic (not 657s) but I love them.

Offline teazer

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Re: CB750 rat bike?
« Reply #106 on: Jan 20, 2019, 00:21:17 »
No riding around our 'hood in all this snow and the east coast is likely to be bad for a couple of days too.  Hang in there and it will eventually improve.

Offline pidjones

  • Posts: 885
I don't think it went THAT fast!
« Reply #107 on: Jan 22, 2019, 16:40:29 »
Made it to the 40s (F) today, so she was pulled out and given her first run. Only ~2 miles total (not tagged or insured yet) revealed that the engine is getting better and better, the trans shifts fine (I just need to get used to it) at least up through 3rd. The problems; front brake is spongy but improving rapidly, rear brake feels firm but does nothing to slow me down, and there was a bit of a problem with the speedometer. Pretty happy with it overall. Guess now work on brakes, repair the speedo (I already have it apart), and go down to buy tags and register. Feels a bit different from the GoldWings that I've been riding the past 15 years or so.

I'm kinda reminded of what Elon Musk said when his Falcon Heavy lifted off. "That f***n' thing took off!"
« Last Edit: Jan 22, 2019, 17:23:01 by pidjones »
"Love 'em all.... Let God sort 'em out!"

Offline jordandogtown

  • Posts: 181
  • Washed up Weekend Warrior
Re: CB750 rat bike?
« Reply #108 on: Jan 24, 2019, 13:15:16 »
It's cool to see you persevere. Lesser men (myself included) could have cut ties at the third/fourth/fifth road block. Hoping you're stubborn enough to keep pushing along. Excited to follow
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

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1979 CB750F Part Out

Offline pidjones

  • Posts: 885
Re: CB750 rat bike?
« Reply #109 on: Jan 25, 2019, 19:32:55 »
This is the second bike that I've had to overcome PO abuse and neglect on. Check my Hunley thread for the first one. Anyway, fixed the speedo needle with an angle of thin clear plastic from a bubble pack. Painted with some left-over florescent orange that I had for painting tiny RC heli parts with (they tend to fly off when you attempt subterranean flight, and the florescent shows up nice at night with a UV flashlight). Ordered some LED bulbs for the dash - had  to keep incandescent for the Neutral, Oil, and High Beam as they are reverse polarity. Didn't try to make it pretty, just functional which is still the theme for this build. Rear brake was just a matter of better attachment for the master cylinder (I had it on with just the top bolt and it tilted - on with both now). Did the red Loctite trick on the starter clutch bolts, but they were still tight.

MAYbe warm enough to ride for an hour or so on Monday. Will still have to keep it in the neighborhood as it still needs mirrors and a horn, license and insurance to be legal. Still, it will be a kick if I can put some more miles on it (from behind the house up our steep drive, down to the road into the subdivision, down it to the cul-de-sac and back, loop down our other steep drive and repeat.

I've ordered some 1" steel tubing to fab into the final baffle in the pipes that a PO had removed. Just need to find something about the diameter of a Mason jar lid to attach them to and then screw onto the end plate of the muffler. I don't think my welding skills are up to that, so it will probably be some kind of pop-riveted affair.
« Last Edit: Jan 25, 2019, 19:37:19 by pidjones »
"Love 'em all.... Let God sort 'em out!"