'81 CB750C "Rock-It" (X-Basket Case)

Re: '81 CB750C Basket Case

Received the petcock that was off this tank from the e-bay seller. Soaking it now.
Picked up a lone piston circlip I was missing along with one cylinder locating dowl from the local honder dealer.
Spent the day with scotch-brite, a pack of cheap tooth-brushes, and rubbing alcohol cleaning the engine. Got it all masked off and ready for the Duplicolor 1650 aluminum engine paint tomorrow.
 
Re: '81 CB750C Basket Case

One more step done....



Never mind the black oil pan, the PO painted it and did a shit job prepping it. Flakes off when hit with the blow gun. I am going to strip it and see how it looks raw. May polish it when I do the other covers. I hope he did a better job on the cylinders, they look pretty good and I like the contrast it will give. Maybe I'll just soda blast all the covers and leave them raw... or paint them all black.
Hmmmmm.

IMG_0345-2.jpeg
 
Re: '81 CB750C Basket Case

Nahhh I'm thinking it looks too "busy"..
Almost like they were an after thought...
Plus, the littlest scratch would show like BAM... IN YOUR FACE!
 

Attachments

  • kansas_cb750_cafe22.jpg
    kansas_cb750_cafe22.jpg
    34.6 KB · Views: 998
Re: '81 CB750C Basket Case

That's Pistol's bike, is it not? The Cycle X two carb intake gave it away. I've not seen these close ups or angles, but the full left side view is my desk top background and my inspiration for my DOHC. Stunning bike.
 
Re: '81 CB750C "Rock-It"

Got the swing arm and shocks installed... looks great. Nothing picture worthy, just a red swinger with clean and shiney aluminum and chrome shocks. Also, cleaned up the triple tree and put it on but before I got the nuts tightened, stood back and took a look see... The original black, even though it's in great shape, really doesn't blend well with the red neck of the frame. So I took it back off and will be stripping the top and the handlebar mount down to the base aluminum and painting the iron lower to match. Thinking it will look much better.
Hit a small snag with the engine reassembly. The center four of the rear cylinder / head studs require an o-ring above the base gasket that was not in the OEM "Gasket set-A". So I need to pick up four of those little 9.6 X 2.6 bits Tuesday before I can install the cylinder.
 
Re: '81 CB750C Basket Case

looking good. a mate of mines has just picked up a Honda CB 900 F Bol d`Or so as they are fairly similar will have to tell him to check out this build.
 
Re: '81 CB750C Basket Case

deepwaterimports said:
looking good. a mate of mines has just picked up a Honda CB 900 F Bol d`Or so as they are fairly similar will have to tell him to check out this build.
I remember back when I was just out of school (82?), the CB900F was THE bike to beat!

I took my calipers and bore gauges to the pistons, rods and cylinders. Measurements were not only in spec but nearly identical down to .01mm. So I hung the pistons on the rods and have the ring grooves all clocked to set the cylinders. Need to pick up 4 o-rings for the studs, and get the tensioner installed, then I can set the cylinder.
Last night I stripped the triple tree pieces and it was definately a good call. Now need to decide if I am going to polish or leave in the cast finish... I'm kind of liking the way it is.
Damn, Should have done the oil pan while I was at it. I didn't think about it until just now. ::)
 
Re: '81 CB750C "Rock-It"

Hoosier Daddy said:
Got the swing arm and shocks installed... looks great. Nothing picture worthy, just a red swinger with clean and shiney aluminum and chrome shocks.

Awww man! I want some new pics! I think from now on, you'll have to consult with me on what is picture worthy. ;D
 
Ha HA... OK you win, I should know better. I have been on your side of the fence and someone posts an update but no pics satisfy my curiosity.



and the top triple, still needs some detailing.





O-rings should be here tomorrow, just in time for Thursday "Bike Nite" so I should be ready to install the cylinders on the engine, then comes the headwork. ;)

Speaking of "headwork" this has been working on my head for some time. Thinking this might be the bike for a Viper fairing... and I got enough paint left to pull it off.

4551672877.jpg
 
Ahhh, thoroughly satisfied!

I vote yes on the fairing. I'm not really a big fairing guy, but I really think it fits the style of bike that you build from looking at your other builds and the direction you're headed with this one, I think it would look really aggressive. I even like the color in the picture, the black would look pretty intimidating.
 
I finally got time to work on the head, lots of scrubbing with various products to clean the carbon from the ports. It was definately worth it, came out nice and clean. What I found that worked the best was a brass brush dipped in Marvel Mystery Oil. Then lapped the 16 valves, and at the end of the night got the valve seals installed.
After reading on the DOHC forum of so many guys destroying the seals trying to install them, I dipped each one in oil, put the valve in the head, slid the seal onto the valve stem and seated it on the guide using a 9mm deep well 1/4" drive socket. Nice even pressure and they popped right on, no fuss. ;D
I've been doing a lot of shopping and Herm at DCC is going to get a pretty decent order as soon as my Pay-pal transfer goes through, along with some specialty bits from other vendors.
Randakks carb O/H kit
Vintagecb750 intake boots
Motorcycle-Superstore tires
 
Have been making progress on the head, easy does it... clean, and careful. Intake side valve springs are done, next comes the exhaust side.
 

Attachments

  • 121009_0004.jpg
    121009_0004.jpg
    198.6 KB · Views: 291
Wow, a lot of nice paert for 10.00 or your half of 10. I win the 50/50 here at work and love going home and handing a couple hundred over to the wife, then spending my half on stuff. Head looks great.

Cheers,

Maritime
 
Maritime said:
Wow, a lot of nice paert for 10.00 or your half of 10. I win the 50/50 here at work and love going home and handing a couple hundred over to the wife, then spending my half on stuff. Head looks great.

Cheers,

Maritime

Yeah Maritime, that $10 worth of tickets at the lodge won this for the Wifey and I to split!
We had over $200 bar tab that night and that left us a little over a grand each. I told her the only stipulation was to NOT pay bills with it, spend it on YOU. ( Let me off the hook to do the same ;) )
 
Yep exactly. if you kept it all for yourself she would eventaully find out and it would ruin your day for sure. I would rather splt it and say the exact thing, this is just to spend on whatever you want, my wife usually gets her hair done or something. I buy bike parts and beer.
and the bills get paid from the regular money as usual.
 
I need to stop looking at this site. Every time I do I want a new project, and I'm still putting my current one back together!
 
Back
Top Bottom