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Author Topic: 1972 CB 750 K2 by Aubi  (Read 2315 times)

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Offline Aubi

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1972 CB 750 K2 by Aubi
« on: February 04, 2017, 12:38:53 PM »
Hi,
as you recommend me I start this project thread.

15.1.2017 I bought my first bike Honda CB 750 K2. Yes, my first bike :-) Even I still dont have driving licence to drive bike stronger than 11kW. So first thing at spring will be go to driving school :-)

But back to my bike.
Bike is 1972 and at 1980 was deregistered from England vehicle register. Before, maybe after this date sameone use it for racing. Probably at 2015 was sold to Germany and sameone start CafeRacer project. But fortunately he ends just with disassembling. Then was at one Czech "bike collector" (he have more than 50 bikes), but he dont have time to restore it, so he offer bike to me. So bike is currently at boxes. Looks complete, but unfortunately without exhausts.

What are my plans? I plan restore it at close as possible to original. I want to be done at summer 2018. But who knows. I need separate my time and money to last modification of my "racing" Classic Mini Cooper (its done but I "need" modify hood and other rims) and for wife I promise also classic mini (there'm done with the chassis and engine).

Last 2 weeks I did:
Completely disassembled engine. Not so much problems - just one broken (twisted) screw. And I need drill out all 4 screw which holds "shaft holder". But its done and fix.
Pinstons and Cylinder are at grinder to check it. Head - valve seat and valves are allready "grinded". Rest of engine looks OK, except a few bearings and oil seals...

I start to thing how to clean engine.... Probably wins shot peening (blasting with small glass balls) I want to test it at same small part and we will see.



     

 
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB 750 K2 by Aubi
« Reply #1 on: February 04, 2017, 02:15:40 PM »
Aubi,

Welcome to the forum! It sounds like you have some mechanical skill -- if you are working and racing a classic Mini Cooper.

We are happy to help and interested in your project!
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
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Offline Stev-o

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Re: 1972 CB 750 K2 by Aubi
« Reply #2 on: February 04, 2017, 02:59:49 PM »
WElcome!  We like cars too.   

Are you using an impact driver on the screws?
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Aubi

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Re: 1972 CB 750 K2 by Aubi
« Reply #3 on: February 09, 2017, 12:40:55 AM »
Hi, i don't tray impact driver for shaft holder screws. Because I don't have suitable holder for Phillips screws. In fact i use impact driver just for removing wheels from car.

And bad news from machinery shop -  at one cylinder is distance between piston and cylinder is 0,007mm  :(

But new pistons and rings are on way from Japan.  ;)

Any suggestions for paint/varnish for engine after shot peening?
« Last Edit: April 02, 2017, 10:18:55 PM by Aubi »
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Offline Elvarko

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Re: 1972 CB 750 K2 by Aubi
« Reply #4 on: February 09, 2017, 02:47:54 AM »
Sounds like you are having fun.  Do not be afraid to ask questions as the support you get is fantastic.  This is a great forum use it, oh and we like pictures!!! 
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Offline jgger

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Re: 1972 CB 750 K2 by Aubi
« Reply #5 on: February 11, 2017, 11:25:15 AM »
Aubi the impact driver that Stevo is talking about is the kind you strike with a hammer, not an air/electric impact. Usually has a 3/8 socket drive and assorted bits.
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Offline Aubi

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Re: 1972 CB 750 K2 by Aubi
« Reply #6 on: April 02, 2017, 02:23:16 PM »
Hi all,
just quick update. New pistons arrive from Japan  :) and grinding is done. And rest of engine is prepared for cleaning.

I also check all boxes and find lot of unnesesery parts, and same missing parts. So I start searching on eBay and other shops.

« Last Edit: July 18, 2017, 01:09:25 PM by Aubi »
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Offline Aubi

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Re: 1972 CB 750 K2 by Aubi
« Reply #7 on: October 29, 2017, 04:59:46 AM »
Hi all,

Please can anyone help me? I need to recreate foot peg mounts - because previous owned cut it. Cay anyone measure distance between holders,  length (A) and height(B)?
See pictures.

Thanks in advance





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Offline Aubi

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Re: 1972 CB 750 K2 by Aubi
« Reply #8 on: November 11, 2023, 12:25:25 PM »
Hi, it takes much more time than I expect but I’m finally done.
I already drove 1000km, without any problem. CB is great,

i just need to finish a few visual details. (seat trim, timing cover,. )
 
Here you have same pictures, from progress:
« Last Edit: November 11, 2023, 12:34:25 PM by Aubi »
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Offline Aubi

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Re: 1972 CB 750 K2 by Aubi
« Reply #9 on: November 11, 2023, 12:39:06 PM »
And thanks for all the topics on this forum.
It was great source of information for me.

PS: And Mini for wife is also done:
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Offline denward17

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Re: 1972 CB 750 K2 by Aubi
« Reply #10 on: November 11, 2023, 12:56:15 PM »
Nice looking Honda and Mini!
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Offline newday777

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Re: 1972 CB 750 K2 by Aubi
« Reply #11 on: November 11, 2023, 02:53:26 PM »
Well done on both!
Back in 1972, I used to get rides to school in a friend's Mini the same red/white. Sometimes we'd pack 6 or 8 in it....
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Stev-o

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Re: 1972 CB 750 K2 by Aubi
« Reply #12 on: November 15, 2023, 06:59:15 AM »
Quote from: Aubi on February 04, 2017, 12:38:53 PM
What are my plans? I plan restore it at close as possible to original. I want to be done at summer 2018.

Wow...a 6+ year restoration!  Looks great....nominating you for BOTM...


http://forums.sohc4.net/index.php/topic,180400.0.html
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline willbird

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Re: 1972 CB 750 K2 by Aubi
« Reply #13 on: December 02, 2023, 01:47:52 PM »
That is a BIG circle back LOL.

I wonder how many of the folks who built our bikes are still alive today ??

Bill
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Offline BenelliSEI

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Re: 1972 CB 750 K2 by Aubi
« Reply #14 on: December 02, 2023, 05:00:17 PM »
Very nice work. Love the Mini too!
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