Project CB750 - Printable Version

The following warnings occurred:

Warning [2] Undefined property: MyLanguage::$archive_pages - Line: 2 - File: printthread.php(287) : eval()'d code PHP 8.2.28 (Linux)

File	Line	Function
/inc/class_error.php	153	errorHandler->error
/printthread.php(287) : eval()'d code	2	errorHandler->error_callback
/printthread.php	287	eval
/printthread.php	117	printthread_multipage

Project CB750 - Printable Version

+- Madison Motorsports (https://forum.mmsports.org)
+-- Forum: Technical (https://forum.mmsports.org/forumdisplay.php?fid=4)
+--- Forum: Member's Projects (https://forum.mmsports.org/forumdisplay.php?fid=12)
+--- Thread: Project CB750 (/showthread.php?tid=6812)

Pages: 1 2 3 4 5 6 7 8

Project CB750 - .RJ - 12-20-2007

So... I brought home this basketcase of a 1971 CB750 Smile

It was cheap, and with the parts I sold out off of the bike that I wasnt going to use, I made my money back easily. This is how I picked it up - the front end wasnt really attached to the bike, I just slid the steering stem in the headstock to get it standing up. The rest came in the pile of boxes...

[Image: IMG_0177+_Large_.JPG]

It came with some pretty nice stuff - new gasket kit, a nice 4-1 header/exhaust, a stainless steel bolt kit for the engine covers (to replace all the philips head fasteners) but most everything was junk. The engine had already been taken out of the bike, and it was junk so I left everything except the cylinders and head. The camshaft was scored up and seized, so i decided it wasnt worth tearing into.

I'm sure you're thinking... wow, what a mess. What have I done now? Well read on Smile

Within a few days I had it down to the frame and I knocked off all the brackets (passenger pegs, centerstand, etc) that I wont be using and ground down the welds with an angle grinder

[Image: IMG_0179+_Large_v2.JPG]

35 year old carbamaphones - brass floats!

[Image: IMG_0174+_Large_.JPG]

CB750 cylinders make good beer holders Smile

Sandblasting the frame

[Image: IMG_0430+_Large_.JPG]

Sand on my grill

[Image: IMG_0435+_Large_.JPG]

Sandblasted frame. Swingarm is longer/wider than stock, from a later model CB750.

[Image: IMG_0439+_Large_.JPG]

Powdercoated bits (Thanks Dan!)

[Image: P1010548+_Large_.JPG]

Getting there

[Image: IMG_0475+_Large_.JPG]

Custom engine cart, from Home Depot Racing. Picked up this engine from a salvage yard in Baltimore - that was an interesting trip. Its in the ghetto (seriously) and cash only - nice guy that runs the shop though. I called ahead of time and the engine he had pulled out for me was missing some things and we both agreed I wasnt buying that one. He had a complete bike "in the back" so he wanted to pull the motor - I'm thinking this is going to take forever... but he said he didnt have a title for it so the frame was junk, and he just took a sawzall, made 4 cuts in the frame and out she goes - 10 minutes.

[Image: IMG_0451+_Large_.JPG]

Engine painted and installed (you can see the big ugly 750 tank here)

[Image: IMG_0628+_Large_.JPG]

Gas tank modifications - its a CB500 tank - much smaller than the 750 tank, and not so slab sided. Still have some more work to do on the tank.

[Image: IMG_0631+_Large_.JPG]

Wheels - front wheel is stock, rear wheel is a 16" harley rim laced to the stock hub. Tire is a 150/80/18. Both sprockets are offset to clear the tire.

[Image: IMG_8229.JPG]

Rebuilding the carbs, setting float height

[Image: IMG_8271.JPG]

RC51 Rearsets, VFR shifter

[Image: IMG_8386.JPG]

Old school seat (they were sold as a honda accessory in the 70's), CL350 front fender, clip ons, exhaust, gauges, steering damper, brake master cylinder, engine covers and cables installed - current pics:

(very little is original to the bike - probably just the frame, triple trees, front wheel and rear wheel hub)

[Image: IMG_8418.JPG]

So whats left? Got a list... getting shorter every week.

- Paint (gas tank, oil tank, headlight bucket). Tank is going to be white with red stripes, like the Ducati Monster S4RS

[Image: V2_2006-Ducati-Monster-S4RS-02.jpg.jpg]

[Image: V2_2006-Ducati-Monster-S4RS-02.jpg.jpg]

- Brakes. I need a front brake hose, and figure out a way to 'pull' the rear brake (its a cable pull drum). I know how I'm doing it, just a matter of getting the parts and machine work done.
- Wiring. Build a battery box (under the seat) and build a wiring harness. This is going to be fun, wiring up stock ignition switch, modern voltage regulator, RC51 kill switch... The goal here is to do it better than the factory had done it in 1971.
- Build a Rear license plate/brake light bracket
- Ignition. I'm tossing the stock points and going with electronic ignition.

Thats about it for the big items.

Should be on the road in time to ride in the spring Smile

Going to be a long winter, better stock up on :beer:

MAD PROPS to Pete, Dan, Ginger, Phil, Kaan, Bike Bandit, Sam Adams, Magic Hat and ebay (and anyone else I left out thats helped me with this thing!) :lol:

[Image: madprops.jpg]

- Apoc - 12-20-2007

bling on blinger!

- Maengelito - 12-20-2007

WTF is wrong with you?

looks good even though i dont know shit about bikes let alone old bikes, but seriously. WTF is wrong with you?

- .RJ - 12-20-2007

Maengelito Wrote:WTF is wrong with you?

You should know better :lol:

- Ginger - 12-20-2007

WTF did you do to the seat?! Take all the painted shit off there! I swear to god, if you don't do it, I will!

(looks good, btw)

- Apoc - 12-20-2007

new seat > old seat

- .RJ - 12-20-2007

Old seat - I paid too much $$ for it really, and its good but I like the new one much better. I got a smokin deal on it compared to what I've seen them sell for... I doubt any 35 year old motorcycle seat is really a good deal :lol:

[Image: IMG_8401.jpg]

- Apoc - 12-20-2007

It's the stitching and more edgy curves of the new one that makes it mo betta.

- PDenbigh - 12-20-2007

That is looking great! I'm impressed!

+1 vote for the stitched seat.

- Evan - 12-21-2007

needs more UG

- ScottyB - 12-21-2007

once again i know nothing of bikes but that thing is cool :thumbup:

- HAULN-SS - 12-21-2007

Uhh - so I'm confused. which seat is staying? The older looking one looks better

- .RJ - 12-21-2007

The one in the first post is staying (with the honda decals on it)

- Kaan - 12-21-2007

two things... is your tank finished? i'd like to start cutting and welding on it. Wink

i'm going to make you weld your own steering stabilizer mount... i think... if you want to.

oh and i think you need to paint the front fender.

- .RJ - 12-21-2007

Tank isnt finished... I'm slacking. Little things keep eating up a lot of time - I probably spent 2 hrs dicking with the new throttle tube and routing the cables. There's too many ffing cables on the bike (clutch, throttle x 2, speedo, tach...)

- Feersty - 12-21-2007

I know it pains me to say this about someone so critical of me, but that is absolutley immaculate. Having the skill to build a bike from the ground up is definitely something to be truly grateful for.

- Chris - 12-27-2007

wow thats pretty cool! I'll have to talk to you sometime about the sandblaster you used. I want to rent one eventually to sandblast a trailer.

- Dave - 12-28-2007

sweet build thread RJ!

- .RJ - 12-28-2007

Kaan made the steering damper mount last night :thumbup: Pics after I paint it today Smile

- Kaan - 12-28-2007

.RJ Wrote:Kaan made the steering damper mount last night :thumbup: Pics after I paint it today

yeah and we hacked up the gas tank... which now has to go to piper to get welded hahaha... he's going to have to lay filler rod in the gap and run a bead... at some point i need to just buy a welder so i can stay in practice. oh and RJ tried to run his first bead last night!