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Author Topic: Finally rebuilding my CB 750  (Read 13572 times)

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Offline Leino

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Finally rebuilding my CB 750
« on: April 13, 2020, 05:04:37 am »
I bought this bike almost 20 years ago. It was the cheapest I could find back then and as anyone can guess, the condition of the bike wasn't anything to brag about. It was missing the original gauges, it had a set of (to my untrained eye) ugly wheels which turned out to be Kim Tab Snowflakes. I sold them to a guy in Porvoo I think? He had a CB with a sidecar. All the wiring was crap as were the forks and brakes etc. etc.

I rode the bike hard for a period of four years, thrashed at least two transmission etc. At one point I upgraded the suspension and brakes with FZR 600 stuff, adequate brakes and forks for a bike of this age. Not too hi-tech but in balance with the stock frame imo.

2005 I bought my first Suzuki and the Honda was left in the garage waiting for it's turn. I have purchased a lot of parts for it over the years and now it's high time to put them in use and ride her again.
« Last Edit: October 08, 2022, 12:47:13 am by Leino »
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #1 on: April 13, 2020, 05:32:03 am »
Few words about the motor and other stuff around it:
Wiseco 65mm pistons
ported head, stock valves, Kibblewhite springs and retainers
125-75 cam
undercut transmission
lightened crank
GSX-R 750 carbs
Dyna 2000 ignition
not sure about the exhaust yet, perhaps a Delkevic
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Offline turboguzzi

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Re: Finally rebuilding my old CB 750
« Reply #2 on: April 13, 2020, 07:30:36 am »
gee, it's been a while.....
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #3 on: April 13, 2020, 07:55:25 am »
Quote from: turboguzzi on April 13, 2020, 07:30:36 am
gee, it's been a while.....
Oh yes  ;D
I'm trying to sort out all my bikes now. Maybe one bike a year plus some time spent on my '89 Chevy Van.

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Offline MRieck

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Re: Finally rebuilding my old CB 750
« Reply #4 on: April 13, 2020, 02:17:48 pm »
Quote from: turboguzzi on April 13, 2020, 07:30:36 am
gee, it's been a while.....
....no $hit. I was a young man when I helped Juha out with parts. I am now officially elderly. ;D
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Offline Stev-o

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Re: Finally rebuilding my old CB 750
« Reply #5 on: April 13, 2020, 02:20:37 pm »
Subscribed to see how this goes....
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Tintop

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Re: Finally rebuilding my old CB 750
« Reply #6 on: April 13, 2020, 05:48:29 pm »
Quote from: Stev-o on April 13, 2020, 02:20:37 pm
Subscribed to see how this goes....

+1 sounds like an interesting build.
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1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline PeWe

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Re: Finally rebuilding my old CB 750
« Reply #7 on: April 13, 2020, 09:59:17 pm »
Photos? :)
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #8 on: April 14, 2020, 12:48:19 am »
Quote from: MRieck on April 13, 2020, 02:17:48 pm
Quote from: turboguzzi on April 13, 2020, 07:30:36 am
gee, it's been a while.....
....no $hit. I was a young man when I helped Juha out with parts. I am now officially elderly. ;D
Ok, so now I'm a young man not a kid anymore  ;D
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #9 on: April 14, 2020, 12:49:13 am »
Quote from: PeWe on April 13, 2020, 09:59:17 pm
Photos? :)
I'll post some as I go along with the build.
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #10 on: April 14, 2020, 01:11:27 am »
GSX-R carbs being cleaned and modified to fit CB.



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Offline WhyNot2

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Re: Finally rebuilding my old CB 750
« Reply #11 on: April 14, 2020, 05:58:15 am »
I'm in, what year is the 750.......pics...??????

Wow, nice carbs.
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Offline turboguzzi

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Re: Finally rebuilding my old CB 750
« Reply #12 on: April 14, 2020, 06:48:32 am »
Quote from: WhyNot2 on April 14, 2020, 05:58:15 am
I'm in, what year is the 750.......pics...??????

Wow, nice carbs.
yep, VM29SS from first series GSR750 where about the last sides to be fitted to big street bikes.... not that easy to find nowadays.

As a past owner i can tell you that with VM29s, the gsxr was one on-off beast.... fit them with a generation later CV carbs and they become pussycats...
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #13 on: April 14, 2020, 07:13:52 am »
Quote from: turboguzzi on April 14, 2020, 06:48:32 am
Quote from: WhyNot2 on April 14, 2020, 05:58:15 am
I'm in, what year is the 750.......pics...??????

Wow, nice carbs.
yep, VM29SS from first series GSR750 where about the last sides to be fitted to big street bikes.... not that easy to find nowadays.

As a past owner i can tell you that with VM29s, the gsxr was one on-off beast.... fit them with a generation later CV carbs and they become pussycats...
Nice carbs yes. These were on my sons junior dragbike. 1982 Katana 1166cc with Mike Rieck head and Cam Motioin G4's etc. 142hp at the wheel. Was enough for a 15 year old  ;D
Now they are machined to 32mm.
« Last Edit: April 14, 2020, 07:20:27 am by Leino »
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #14 on: April 14, 2020, 07:15:40 am »
Quote from: WhyNot2 on April 14, 2020, 05:58:15 am
I'm in, what year is the 750.......pics...??????

Wow, nice carbs.
Left the factory 1973, registered to Åland 1974 and to mainland Finland 1975.
Unfortunately I don't have many pics of the bike back then and now it's in bits and pieces. Will post some as I come along.
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Offline PeWe

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Re: Finally rebuilding my old CB 750
« Reply #15 on: April 14, 2020, 07:44:35 am »
142whp is OK for 50-60 years old kid too! :D :D
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #16 on: April 14, 2020, 08:29:52 am »
Quote from: PeWe on April 14, 2020, 07:44:35 am
142whp is OK for 50-60 years old kid too! :D :D
Gets you to work and back in time  ;D
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Offline PeWe

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Re: Finally rebuilding my old CB 750
« Reply #17 on: April 14, 2020, 08:58:13 am »
Quote from: Leino on April 14, 2020, 08:29:52 am
Quote from: PeWe on April 14, 2020, 07:44:35 am
142whp is OK for 50-60 years old kid too! :D :D
Gets you to work and back in time  ;D
I'm sure I'll not stop at my job then! ;)
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #18 on: April 14, 2020, 12:02:56 pm »
Swingarm is a combinaion of FZR and CBR. I wasn't happy with the FZR arm I used 17 years ago, so this is the result. Gonna have it powder coated after I make sure it fits and works like I want it to. Gonna use a Suzuki 4½" x 17" wheel with 160/60 rubber and a combination of Suzuki and Yamaha brake parts.

IMG-20200411-WA0009 by Juha Leino, on Flickr
« Last Edit: April 14, 2020, 12:05:37 pm by Leino »
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #19 on: April 16, 2020, 02:49:44 am »
« Last Edit: April 16, 2020, 10:03:52 am by Leino »
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #20 on: April 17, 2020, 05:53:13 am »
Match made in Japan. Honda throttle and cables fit straight to the Suzuki carbs.

20200417_151109 by Juha Leino, on Flickr
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #21 on: April 24, 2020, 02:35:34 am »
Just noticed Hindle exhaust is available again. Anyone have one of these reproduction pipes?
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Offline MRieck

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Re: Finally rebuilding my old CB 750
« Reply #22 on: April 24, 2020, 11:33:25 am »
Quote from: Leino on April 24, 2020, 02:35:34 am
Just noticed Hindle exhaust is available again. Anyone have one of these reproduction pipes?
I have one but it is sitting in the box. ;D ;D
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Offline Leino

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Re: Finally rebuilding my old CB 750
« Reply #23 on: April 24, 2020, 01:14:34 pm »
Quote from: MRieck on April 24, 2020, 11:33:25 am
Quote from: Leino on April 24, 2020, 02:35:34 am
Just noticed Hindle exhaust is available again. Anyone have one of these reproduction pipes?
I have one but it is sitting in the box. ;D ;D
Doesn't surprise me at all  ;D
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Offline hondaron

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Re: Finally rebuilding my old CB 750
« Reply #24 on: April 24, 2020, 02:47:44 pm »
FWIW several guys on the cb1100f forum have the Hindle pipes on their bikes, and I've seen and heard them in person.
To me it's a really nice looking, quality pipe for the $$$$ 😀
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