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Author Topic: 1971 CB750K1 Project  (Read 2814 times)

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Offline RustyJC

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1971 CB750K1 Project
« on: July 08, 2011, 08:39:57 PM »
Here's my 1971 CB750K1 project before the heavy lifting started.  I've owned the bike since it was new, but it sat in an unheated shed in Ohio for over 20 years.  :-[

Since this photo, the Jardine 4-into-1 headers have been rechromed, fluids changed, new battery installed and the Yoshimura front double disc brake system rebuilt - and, of course, more cleaning and polishing....



Rusty
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1971 CB750K1 (original owner)

2007 BMW K1200GT

Offline Johnie

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Re: 1971 CB750K1 Project
« Reply #1 on: July 09, 2011, 05:48:21 AM »
Welcome to the forum Rusty. She looks nice and ready to ride. Post some more pics once you get her outside. Looks like a great project.
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline zzpete

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Re: 1971 CB750K1 Project
« Reply #2 on: July 09, 2011, 06:34:42 AM »
Looks good already Rusty. Nice to see an original owner still with his bike after 40 years! Welcome to the forum!   :)
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"One of the things that make motorcycling so great because it never fails to give you a feeling of freedom and adventure." - Steve McQueen

Offline Greggo

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Re: 1971 CB750K1 Project
« Reply #3 on: July 09, 2011, 06:40:18 AM »
Nice bike!  I'd like to see some pics of that Yoshi double disc set up!
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Offline 76CB5WI

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Re: 1971 CB750K1 Project
« Reply #4 on: July 09, 2011, 06:41:33 AM »
Very clean engine on that one..nice to start out that way..on a fix up.
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72 CB750
76 CB550

Offline RustyJC

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Re: 1971 CB750K1 Project
« Reply #5 on: July 09, 2011, 07:49:08 AM »
Quote from: Greggo on July 09, 2011, 06:40:18 AM
Nice bike!  I'd like to see some pics of that Yoshi double disc set up!

Ask and ye shall receive - see below.  It also has the Yoshimura Road and Track (3/4 race, if you remember the term) cam and pistons and some other goodies.  While I'm waiting on Reagan at Ace Motorworks to clean and coat the fuel tank innards, I've spun it up on the starter and get 20 lbs oil pressure @ cranking speed and good compression.

This photo was shot before the brakes were rebuilt.  I'm out in the garage installing the rebuilt braking system today, so maybe I'll get some more photos posted later showing my current progress.

On edit:  The front brakes are installed and bled!   ;D

Rusty
« Last Edit: July 09, 2011, 12:09:59 PM by RustyJC »
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1971 CB750K1 (original owner)

2007 BMW K1200GT

Offline RustyJC

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Re: 1971 CB750K1 Project
« Reply #6 on: July 09, 2011, 03:04:09 PM »
Here's a pic after today's brake installation.  Still waiting for the fuel tank to get finished.

Rusty

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1971 CB750K1 (original owner)

2007 BMW K1200GT

Offline RustyJC

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Re: 1971 CB750K1 Project
« Reply #7 on: July 09, 2011, 03:17:36 PM »
A pic of the front brakes after reinstallation and bleeding.

Rusty

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1971 CB750K1 (original owner)

2007 BMW K1200GT

Offline RustyJC

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Re: 1971 CB750K1 Project
« Reply #8 on: July 09, 2011, 03:20:31 PM »
And, finally, the rechromed Jardine headers (originally installed in 1972).

Rusty
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1971 CB750K1 (original owner)

2007 BMW K1200GT

Offline RustyJC

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Re: 1971 CB750K1 Project
« Reply #9 on: July 16, 2011, 08:52:56 AM »
IT'S ALIVE!!!

I got it back together and lit it off at 8:50 this morning with only 2 minor problems:

1. Initially, I wasn't getting fuel flow through the petcock.  Took care of that.

2. One carb had a stuck needle/float and dribbled fuel out the air cleaner.  Got that freed up.

With that done, the engine lit right off.  It took less than a minute for the untouched original carbs to clean up and start hitting on all 4 cylinders, but it's now idling at 1000 RPM (remember - it has the Yoshi cam) and sounding great.  70 PSIG oil pressure @ 2000 RPM (10W-40 Castrol) and no funny noises.  Next step was to unstick the clutch plates - bike on centerstand, 1st gear, clutch in and GENTLE rear brake application - with 2 or 3 stops, the clutch broke loose.

Next step is to take it around the block - with no baffle in the header, 1985 Ohio plates and no inspection sticker.  I hope the local LEOs understand.....

Rusty
« Last Edit: July 16, 2011, 09:08:16 AM by RustyJC »
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1971 CB750K1 (original owner)

2007 BMW K1200GT

Offline RustyJC

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Re: 1971 CB750K1 Project
« Reply #10 on: August 06, 2011, 07:32:17 AM »
Project update.  The bike is insured, inspected, licensed and ready to hit the street.  Here's what it looked like this morning.

Rusty

(The last one slipped in.  The Beemer is jealous of all the attention - and money - going to the 750.)
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1971 CB750K1 (original owner)

2007 BMW K1200GT

Offline hoodellyhoo

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Re: 1971 CB750K1 Project
« Reply #11 on: August 06, 2011, 07:57:23 AM »
Congrats and she looks great! Now get out there and put some miles on her to make up for all those years of sitting :)
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1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
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Offline rickmoore24

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Re: 1971 CB750K1 Project
« Reply #12 on: August 06, 2011, 10:18:21 AM »
Nice to see her back on the road after all those years. Enjoy!
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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 Johnie

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Re: 1971 CB750K1 Project
« Reply #13 on: August 06, 2011, 11:17:33 AM »
Excellent Rusty...another one saved!!! Good job. Ride on man...
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA
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