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Author Topic: 1982 CB750sc:BRAT RACER First bike newbie build  (Read 14528 times)

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Offline JC Blues

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1982 CB750sc:BRAT RACER First bike newbie build
« on: January 30, 2013, 09:57:43 AM »
Welcome all to the beginning stages of my long journey of renewing a old 1982 750SC into a beautiful brat racer. For a little bit of background I bought the bike July 2012 and it sat at my buddies place until this week. It came with no tank, but a seat, title, and a whole lot of nostalgia. I am indeed new to the motorcycle scene but have been wrenching my whole life. I have a Ford AAA certification from high school and whilst no mechanic, hopefully i can pull this build off, plus with help from all of you! I want to finish this project in time for the new riding season but might just be high hopes

As we know pics are required :D. . . lets get started!!



« Last Edit: January 31, 2013, 11:35:09 AM by JC Blues »
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Offline JC Blues

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Re: 1982 750sc: First bike newbie build
« Reply #1 on: January 30, 2013, 10:01:40 AM »
Tearing into the bike I found some nice surprises, these dobber nests were everywhere :o

JC
« Last Edit: February 28, 2013, 11:03:55 PM by JC Blues »
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Offline JC Blues

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Re: 1982 750sc: First bike newbie build
« Reply #2 on: January 30, 2013, 10:05:17 AM »
More Disassembling and creating piles of parts :D

JC
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Offline JC Blues

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Re: 1982 750sc: First bike newbie build
« Reply #3 on: January 30, 2013, 10:09:33 AM »
Not bad for one days work. I've got the carbs,seat,headlight, bars, wiring harness, exhaust, and coils all pulled. I really need to figure out posting pictures as well.

Also I will be refurbishing and selling parts i don't need if anyone wants them to help fund the build :D

JC
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Offline JC Blues

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Re: 1982 CB750sc: First bike newbie build
« Reply #4 on: January 31, 2013, 09:43:15 AM »
Hey all got a bit more work done yesterday. I know the dis-mantaling pics are boring but hey for right now its all I've got  :-[


Starter out


Working on getting the rear brake assembly out


Thats mostly all the work done for about an hour after work also got some baggin' and taggin' done


Last time the bike was registered I may keep this


also got some parts going in the vinegar soak


These parts will be for sale once I clean them up


JC

« Last Edit: May 16, 2013, 12:55:22 AM by JC Blues »
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #5 on: February 01, 2013, 08:42:08 AM »
Well guys got some progress made last night. I'm trying to do something each day even if its small


Got the front ,wheel brakes,and fender off






Next is the forks. Anyone know of any extra steps needed to take the air assisted forks off? ???

JC
« Last Edit: May 16, 2013, 12:49:53 AM by JC Blues »
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #6 on: February 02, 2013, 11:18:17 AM »
hey y'all got some work done yesterday pretty much just have the engine left to take out sunday. . .

Got the rear wheel off


Got the springs and swing arm off!




And of course the forks off



Next up is to start the cleaning and get the engine out and ready for disassembly ;D

JC


« Last Edit: May 16, 2013, 12:47:23 AM by JC Blues »
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #7 on: February 03, 2013, 07:17:29 PM »
Just a quick update . . .

Im down to the frame!!!! :)


Engine ready to be taken apart








And the cleaning begins!!! Also ordered my parts for powdercoating. You guys think I should anodize all the bolts and bits?????

JC
« Last Edit: May 16, 2013, 12:41:45 AM by JC Blues »
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Offline Retro Rocket

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #8 on: February 04, 2013, 01:39:07 AM »
Welcome JC, Don't be put off by the lack of replies mate, 243 views so far so plenty of people watching.... ;D ;)
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Roach Carver

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #9 on: February 04, 2013, 05:30:48 AM »
 The bolts are zinc plated. If you are going for nice original then have them re zinc'd. Otherwise use them as is or get stainless.
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #10 on: February 04, 2013, 11:23:05 AM »
Thanks retro rocket good to get some replies especially from a forum great like yourself! The way I see I'll get a lot more traffic once I get to the meat and "taters" of the build :)
Roach carver: I thought about doing the zinc plating but I figured if I do stainless it would be less than the caswell kit,only I can't find a nice set any suggestions??

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Offline VJ

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #11 on: February 04, 2013, 04:52:34 PM »
Looking good. cant wait to see more of your progress!! What is that other black bike in the back of all your pics??

Oh yeah, shoulda just got a supra brah. . .
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Offline brandEn

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #12 on: February 04, 2013, 05:07:14 PM »
Im gonna tag along.
Its not a SOHC but hey, I still like watching bikes being brought back to life.
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Offline jerry h

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #13 on: February 04, 2013, 05:26:32 PM »
Welcome!

Interesting to see a "newer" (DOHC) model being worked on....  I'll be following along as well. 

Quote
I want to finish this project in time for the new riding season but might just be high hopes

I've found they come apart a lot faster than the going back together part. ;D

Take care.
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"It is not the critic who counts, the credit belongs to the man who is actually in the arena, whose hands are covered with grease and oil."

K2 http://forums.sohc4.net/index.php/topic,105097.0.html

Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #14 on: February 05, 2013, 09:53:58 AM »
Thanks guys and yeah not a sohc couldn't find one near me but soon as I don't I would like to restore one of those as well

BrandEn: glad to see you're on board I love that f3 you built its probably one of my favorite bikes

Jerryh: yeah it seems that way too!!! :D but as long as funds to get in the way I think I have a shot maybe at the latest before June!

And the bike in the background is a cbr1000rr were Honda fans here  ;D
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #15 on: February 06, 2013, 01:20:55 PM »
Hey fellers just a quick update and some questions. No real progress on the bike worth mentioning but did start on rebuilding the controls, and starting into the engine.  I went ahead and bought the stainless bolt kit from z1 and some other bits.

I'm now looking at getting a tank I was wondering what tanks fit the dohc other than the stock ones? I don't want to ruin a good tank by cutting it up to fit, I feel someone else could use it.

I have found that the 350 tanks from 71-72 may fit as well as the 750k tanks. What do you guys think???

Sorry no pics  ;D ;D ;D

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Offline Roach Carver

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #16 on: February 06, 2013, 01:50:46 PM »
I have seen the older cb750 tanks on the later frames although I imagine there was some metal modification to accomodate the different tunnel/backbone.
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Offline Retro Rocket

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #17 on: February 06, 2013, 02:04:21 PM »
Quote from: roach carver on February 06, 2013, 01:50:46 PM
I have seen the older cb750 tanks on the later frames although I imagine there was some metal modification to accomodate the different tunnel/backbone.

Correct, the boldor or dohc frames have side rails that rise up to meet the centre backbone before going back down toward the front steering head section , so modification to the underside of the tank would be essential to make it fit....

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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #18 on: February 07, 2013, 11:21:58 PM »
Thanks guys I found that the 750f tank for the dohc is something similar to what im going for

And with that more progress







Finally got the head off after at least an hour an a half




Cylinder's pretty gunked up





And I couldn't for the life of me get the jugs off any suggestions? heating the seal maybe? ???
« Last Edit: May 16, 2013, 12:34:54 AM by JC Blues »
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Offline iron_worker

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #19 on: February 08, 2013, 07:55:32 AM »
Not sure if it's the same as my 750 SOHC but I went around my cylinders with a rubber mallet and gave it some good solid whacks from all directions. It eventually gave up and popped off.

IW
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #20 on: February 08, 2013, 03:44:01 PM »
Thanks Iron worker I was just going about it the wrong way tried again today using what you said worked like a charm!!!! :)



Jugs Off Thanks IW


 Oh and got a package today from Z1



Engine bolt kit, Manual, and exhaust copper rings!
« Last Edit: May 16, 2013, 12:25:41 AM by JC Blues »
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #21 on: February 10, 2013, 09:45:51 AM »
Hey guys so I went to clean the pistons and just wanted to get some advice



number 4 the rings are really tight any suggestions for getting them off


And on number 1 the rings are really loose


I havent measured them yet, need a new caliper, but the cylinders all look good and so do the skirts. Should i be apprehensive about the differences?? ???
« Last Edit: May 16, 2013, 12:22:26 AM by JC Blues »
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Offline chris mcshifty

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #22 on: February 10, 2013, 10:20:38 AM »
You may jus want to get a top end kit with pistons and all
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Offline iron_worker

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #23 on: February 11, 2013, 09:15:28 AM »
Are the rings just seized in the groove on #4?

IW
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Offline JC Blues

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Re: 1982 CB750sc:BRAT RACER First bike newbie build
« Reply #24 on: February 11, 2013, 11:08:39 AM »
Chris that's not in the budget for this build I want to keep the motor costs down to get her back on the road asap.

IW yeah they are pretty much seized up I just don't know how to get them off.

Any suggestions maybe just a soak?  ???
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