Author Topic: New Project - 1972 Honda CB750  (Read 4818 times)

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Offline God of Thunder

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Re: New Project - 1972 Honda CB750
« Reply #75 on: July 15, 2022, 09:47:11 AM »
Ordered new throttle/clutch cables today from 4into1. Can't wait to get these installed so my hand doesn't hurt!
1970 CB750K1
1976 CB750K6

Offline Phoenix

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Re: New Project - 1972 Honda CB750
« Reply #76 on: July 15, 2022, 12:23:29 PM »
The spring may still be tight.  I tokk the spring off the carb and stretched it a little.  Do a little at a time remembering you can't unstretch.  Good luck.
Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline God of Thunder

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Re: New Project - 1972 Honda CB750
« Reply #77 on: July 25, 2022, 09:23:34 PM »
Woooo! Yesterday I installed a new clutch cable and new throttle cables. The throttle has some play in it that I can't seem to adjust out - but its not terrible. Makes a HUGE difference while driving. We're getting closer!





1970 CB750K1
1976 CB750K6

Offline newday777

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Re: New Project - 1972 Honda CB750
« Reply #78 on: July 26, 2022, 03:42:55 AM »
Woooo! Yesterday I installed a new clutch cable and new throttle cables. The throttle has some play in it that I can't seem to adjust out - but its not terrible. Makes a HUGE difference while driving. We're getting closer!







Just a FYI on the throttle cables, it looks like you have them routed wrong. Do the throttle cables bind in any position when you slowly swing the bars back and forth from lock to lock? There shouldn't be any binding. I just installed a set of those bars and the short cable set from 4into1 on my K5.
It looks like you have them on the right side of the frame, the vin plate side of the neck? If so, they should go around the other side of the steering neck, on the left side of the frame, then in through the triangle behind the coils to the carb pulley. This is the way Honda originally routed the throttle cables. I'll try to get to my shop tonight after work and get some pictures.

Here is a link with a picture of the stock throttle cable routing(I downloaded the picture and attached it here, 2nd picture)

http://forums.sohc4.net/index.php/topic,20697.0.html

I've had a problem with the 4into1 short throttle cables on the pull cable with the adjuster locking nuts at the carb pulley being slopy loose to the threads of the barrel that when I tightened the nuts to lock it in place the second nut jumps the threads and won't tighten the cable. They sent me a replacement cable but it has the same problem of poor quality control in their manufacturing. I got it to lock somewhat by moving the second nut further backon the barrel to tighten it there and take up the slack up on the bar end of the cable. We'll see if it holds up with time but I'm not holding my breath......
« Last Edit: July 26, 2022, 03:45:35 AM by newday777 »
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 newday777

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Re: New Project - 1972 Honda CB750
« Reply #79 on: July 26, 2022, 04:41:36 AM »
Some more reading about cable routing

http://forums.sohc4.net/index.php/topic,164060.0.html

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 God of Thunder

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Re: New Project - 1972 Honda CB750
« Reply #80 on: July 26, 2022, 08:31:16 AM »

Just a FYI on the throttle cables, it looks like you have them routed wrong. Do the throttle cables bind in any position when you slowly swing the bars back and forth from lock to lock? There shouldn't be any binding. I just installed a set of those bars and the short cable set from 4into1 on my K5.
It looks like you have them on the right side of the frame, the vin plate side of the neck? If so, they should go around the other side of the steering neck, on the left side of the frame, then in through the triangle behind the coils to the carb pulley. This is the way Honda originally routed the throttle cables. I'll try to get to my shop tonight after work and get some pictures.

 Well - that stinks.
1970 CB750K1
1976 CB750K6

Offline newday777

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Re: New Project - 1972 Honda CB750
« Reply #81 on: July 26, 2022, 08:41:01 AM »

Just a FYI on the throttle cables, it looks like you have them routed wrong. Do the throttle cables bind in any position when you slowly swing the bars back and forth from lock to lock? There shouldn't be any binding. I just installed a set of those bars and the short cable set from 4into1 on my K5.
It looks like you have them on the right side of the frame, the vin plate side of the neck? If so, they should go around the other side of the steering neck, on the left side of the frame, then in through the triangle behind the coils to the carb pulley. This is the way Honda originally routed the throttle cables. I'll try to get to my shop tonight after work and get some pictures.

 Well - that stinks.

Are they binding st any point in the swing of the bars???
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 God of Thunder

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Re: New Project - 1972 Honda CB750
« Reply #82 on: July 26, 2022, 11:26:57 AM »

Just a FYI on the throttle cables, it looks like you have them routed wrong. Do the throttle cables bind in any position when you slowly swing the bars back and forth from lock to lock? There shouldn't be any binding. I just installed a set of those bars and the short cable set from 4into1 on my K5.
It looks like you have them on the right side of the frame, the vin plate side of the neck? If so, they should go around the other side of the steering neck, on the left side of the frame, then in through the triangle behind the coils to the carb pulley. This is the way Honda originally routed the throttle cables. I'll try to get to my shop tonight after work and get some pictures.

 Well - that stinks.

Are they binding st any point in the swing of the bars???

Not in the few miles I drove it yesterday. But I'd still like them to be correct.


Additionally - these Handlebars. I got these from VintageCB750.com - it says "Stock Type Handlebar for the CB750K (1972) - Chrome. Drilled for wires like the OEM type.
Width 28 1/4" - Rise 3" - Pullback 4" x 7/8"Dia" - However when I look at other pictures of 72s, their handlebars seem to be taller than these. Am I missing something?
1970 CB750K1
1976 CB750K6

Offline newday777

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Re: New Project - 1972 Honda CB750
« Reply #83 on: July 26, 2022, 07:14:57 PM »
They are the European stock bars. USA had taller 4 or 5" bars.
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