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Author Topic: "Sancha" - My cb750 Cafe Project - Finished Pics  (Read 12752 times)

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Offline goaarongo

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"Sancha" - My cb750 Cafe Project - Finished Pics
« on: May 14, 2010, 12:11:20 pm »
I started this project with just a frame and a few miscellaneous parts, and have been in "search and procure" mode for the past several months.  Things are coming together now and I am rounding the bend to start with the real building of this bike, so now seems like as good a time as any to start my project thread.  Been taking some pictures along the way, so let me get right to the good stuff...

In the beginning, there was a frame.
   

Then came some wheels and a motor. And since its a Cafe bike, why not throw some clubman handle bars on it?  Looks cool already.


Not much, but its a start.
« Last Edit: February 16, 2011, 09:05:24 am by goaarongo »

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #1 on: May 14, 2010, 12:18:59 pm »
My first motor had some problems.

Stuck and broken valve cover screws.


And the real bummer - a busted case from a broken chain.  Someone had actually tried to repair it with bondo.


I finally got the broken screws out, but rather than track down a tig welder to repair the bottom case, I took a friend up on the offer of a free (although not quite complete) motor that seemed to be in better condition.  

Of course, the pistons were frozen...


I got some good comments on my removal technique: http://forums.sohc4.net/index.php?topic=70136.0
« Last Edit: July 27, 2010, 11:09:03 am by goaarongo »

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #2 on: May 14, 2010, 12:25:01 pm »
I did some frame modifications in between cussing at motors.

Before:


After:


I nicked the spot that holds the cam for the rear brake pedal.  
I'll probably try to patch that before I get the frame powder coated.
« Last Edit: July 27, 2010, 11:09:47 am by goaarongo »

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #3 on: May 14, 2010, 12:28:49 pm »
Finally got my motor squared away and completely dismantled.  



« Last Edit: July 12, 2010, 01:35:04 pm by goaarongo »

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #4 on: May 14, 2010, 12:32:41 pm »
The paint job on the motor has been an adventure, but I'm pretty happy with my results so far.  



I modified these tappet covers for a slightly more modern look...  


Some of you may have already seen this pic - I think my fins came out pretty nice...
« Last Edit: October 12, 2010, 07:10:05 am by goaarongo »

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #5 on: May 17, 2010, 12:07:40 pm »
Made real progress this weekend.  Paint on the motor is almost completely done, but the real fun was fitting up my tank and seat.  I also assembled the rear end, just to see what it would look like. 


Actually starting to look like a bike now.  

The paint came out pretty good - hope it sticks.
« Last Edit: July 27, 2010, 11:13:18 am by goaarongo »

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #6 on: July 12, 2010, 12:42:58 pm »
I added a couple of steering stops to my lower triple tree (thanks for the ideas Architect).  
I drilled and tapped mine and added some cap screws.  


I broke a tap off in the second hole I did.  That was a hassle, but I finally got it all squared away and was even able to complete the tap job without ruining the new threads.  I suppose these could be adjusted out even further by adding a washer or two, but they seem perfect as is.

And finally, I have a rolling chassis with all the fit-ups and mods done.  Just in time to be completely disassembled again and taken to the powdercoater.  
« Last Edit: July 27, 2010, 11:14:14 am by goaarongo »

Offline SKTP

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Re: "Sancha" - My cb750 Cafe Project
« Reply #7 on: July 12, 2010, 01:09:37 pm »
looking good!
1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
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Offline jaguar

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Re: "Sancha" - My cb750 Cafe Project
« Reply #8 on: July 12, 2010, 09:56:05 pm »
very nice

what wheels and rear swing arm are those?

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #9 on: July 13, 2010, 07:13:56 am »
Thanks for the comments - The front wheel is off a '77 goldwing I think.  I had to machine one of my discs to get the proper alignment, but it was already set up for dual so i think it made that conversion a little easier.  The rear wheel is an 18" Akront rim laced to the 750 hub and I got the swingarm from Carpy.

Offline goaarongo

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Clean frame and lots of real mechanical type stuff
« Reply #10 on: July 26, 2010, 05:36:56 pm »
Finally starting to see the light at the end of the tunnel on the motor overhaul.  Installed my new block and pistons this weekend.  While I was in there, the motor also got new rod bearings, camchain, and tensioner wheel.  She shifts through all the gears and turns over well. 



I also rebuilt the clutch, and did some top end work.  I was really pleased with the way my valves lapped in...



And while I was doing that, I had almost 30 peices powdercoated flat black.



Not the greatest pic, but you get the idea.

Offline rickmoore24

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Re: "Sancha" - My cb750 Cafe Project
« Reply #11 on: July 29, 2010, 12:27:15 pm »
I like when the project just starts rolling, great job so far. She's looking grand!
1972 CB750 K2 (Daily Runner)
1972 CB750 K2 (Sold)
1973 CB750 K3 (Hardtail 836cc)
1998 CBR F3 - R.I.P., went down on the 101 in Calabasas, Ca.
1995 EG6

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #12 on: August 05, 2010, 07:54:02 am »
So two steps forward and one step back.  After I installed my pistons, I was reading a thread on this site and remembered that I had forgotten the four rubber seals around the bottom of the cylinders.  So, I yanked the block off and put them in, and then proceeded to snap a ring on piston #1 as I was reassembling.  Needless to say, I think I said a cuss word or two.  

So, I hunted around and found another set.  I was sweating it a little because a .75 overbore (3rd over) is not the most common size.  But, I got lucky and a week later I am back on track.

 

I also managed to get my cam installed.  I'm using a hop-up cam that I got from Cycle X as part of their "Power Up Kit".  Talking to Ken about motors and carbs is the best part about being one of their customers.



Motor should be moving to the frame soon...



« Last Edit: October 12, 2010, 07:12:35 am by goaarongo »

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #13 on: September 07, 2010, 03:26:08 pm »
The heat in Texas is killing me.  Had lots of distractions lately with work and life in general, but managed to make a little progress...

Motor is now in the frame.


Dual disc modification is set and ready for fluid.


Chain, suspension, etc, all rolling.

Offline rickmoore24

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Re: "Sancha" - My cb750 Cafe Project
« Reply #14 on: September 08, 2010, 01:54:07 pm »
Yeah!! Nice job overcoming some setbacks, cant wait to hear her start.
1972 CB750 K2 (Daily Runner)
1972 CB750 K2 (Sold)
1973 CB750 K3 (Hardtail 836cc)
1998 CBR F3 - R.I.P., went down on the 101 in Calabasas, Ca.
1995 EG6

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #15 on: September 22, 2010, 09:23:30 am »
Carbs are rebuilt:


Had a little fun with some fiberglass:


More on that here: http://forums.sohc4.net/index.php?topic=77262.0

Offline Loki047

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Re: "Sancha" - My cb750 Cafe Project
« Reply #16 on: September 22, 2010, 10:48:28 am »
Thanks for posting the pictures. Looking very pretty

Offline Coyote13

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Re: "Sancha" - My cb750 Cafe Project
« Reply #17 on: September 22, 2010, 12:25:36 pm »
Hey man, did you ever figure out what ignition system you're gonna go with or has that taken a backseat? One of my coils is about to go and I'm thinkin about the Cycle X kit.
'78 CB750K.  Throttle ripper.
'71 CB100.  Grocery getter.
'01 XL883.  Panty dropper. Gone but not forgotten.

Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #18 on: September 22, 2010, 12:29:18 pm »
I did go with the cycle X kit, but have not timmed or run it yet.  Prety easy to install though and appears to be a quality product.   
Hoping to work on electronics this weekend, so I could have it fired up in another couple weeks.   I'll keep you posted. 

Offline UK Pete

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Re: "Sancha" - My cb750 Cafe Project
« Reply #19 on: September 22, 2010, 12:54:55 pm »
Nice project , i just love the look of the engine
Pete

Offline Coyote13

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Re: "Sancha" - My cb750 Cafe Project
« Reply #20 on: September 22, 2010, 01:29:04 pm »
Forgot to mention, bike looks AWESOME
'78 CB750K.  Throttle ripper.
'71 CB100.  Grocery getter.
'01 XL883.  Panty dropper. Gone but not forgotten.

Offline haggeo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #21 on: September 22, 2010, 11:23:42 pm »
looks nice. i keep seeing guys painting the aluminum side/valve covers on their bikes and it looks so nice. makes me wonder about the many hours i've spent sanding and polishing with no end in sight :-\

Offline sinister902

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Re: "Sancha" - My cb750 Cafe Project
« Reply #22 on: September 23, 2010, 05:21:31 am »
looking good

Offline hapakev

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Re: "Sancha" - My cb750 Cafe Project
« Reply #23 on: September 23, 2010, 07:08:41 am »
Engine looks great man!  Whole bike looks great!  What was the process on polishing the fins on everything?
Smoking Jack
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Offline goaarongo

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Re: "Sancha" - My cb750 Cafe Project
« Reply #24 on: September 23, 2010, 07:46:28 am »
Thanks for all the positive comments.  I'm hoping to paint all the bodywork not this weekend but next.  Last big task is wiring everything, and I'm already getting started on that. 

Polishing the fins was not too tough, it just took patience.  I have lots of finned pieces, so I tried almost every method (taping sections off, polishing the paint off after the fact, etc..).  The best technique I came up with goes as follows: 

I used a sanding disc on my angle grinder to smooth everything out, then a went over everything with a couple different grits of sandpaper, getting progressively finer.  Think I stopped at maybe 800 or 1000.  Then I painted everything.  After the paint had cured somewhat, I cut it off the polished surfaces with a razor blade, being careful not to snag or pull the paint.  I basically cut up the paint job while it was still somewhat tacky.  When it was totally dry I hit it lightly with the finest grit sandpaper one more time. 

After that, most of the parts got baked in my oven (per the directions on the paint) and I spent the next two days eating at the mexican food place down the street with my kitchen windows open.       


 

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