Author Topic: CB750K4 - new updates 04.18.24 All issues resolved and ready to ride  (Read 56284 times)

0 Members and 1 Guest are viewing this topic.

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
Thanks Greg I hope your recovery is going well.  I will forever be chasing you on mileage -first thing i thought of when I turned 90K! I also have a Tourance on the VStrom - been using that model tire for 9 years and have really liked the handling in wet/dry conditions. For bigger bikes I think it works well.

Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Jerry Rxman Griffin aka MuthaF'er

  • This MuthaF'er is getting to be a
  • Really Old Timer ...
  • *******
  • Posts: 14,789
  • Bought her new 4/75
You boys are doing enough mountain twisties! Use all yer tire  ;)
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Kevin D

  • Old Timer
  • ******
  • Posts: 2,675
  • SE Michigan
Quote
90,000 miles and the perfect ride

Way to go Andy. I'm always seeking that perfect ride: a lonesome road, nice scenery, and a smooth running motorcycle.
71 CB750 K1
100,000 miles
Original Owner
———past———
70 SL100/125/150
70 Candy BlueGreen CB 750 K0
————————————————-
Former Honda parts kid/counter kid/do all
—————————————————————-
Whether you think you can or think you can’t, you’re right
Genius is 99% perspiration, 1% inspiration

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
Ok so I definitely cheated last night on balancing my rear tire....MikeR stepped in to help with this



The good news - I had got the tire on myself successfully and the bead had seated ok. The bad news...my 45 year old rim was not perfectly round...however we had Mikes electronic balancer to help and Mikes years and years of experience.



The location to balance



Went from this...



To finally this...



Another great learning experience - thank you Mike!!


Sent from my iPhone using Tapatalk
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Jerry Rxman Griffin aka MuthaF'er

  • This MuthaF'er is getting to be a
  • Really Old Timer ...
  • *******
  • Posts: 14,789
  • Bought her new 4/75
Must be nice!! Nice machine Michael. Not bad for a shade tree garage mechanic  ;)
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline MRieck

  • Really Old Timer ...
  • *******
  • Posts: 10,450
  • Big ideas....
Must be nice!! Nice machine Michael. Not bad for a shade tree garage mechanic  ;)
Thanks Jerry.....bought when I had my bike shop in the 90's. Newer machines just clamp the OD of the tire......much easier then the arms. Got a manual Coates tire changer too. ;)
Owner of the "Million Dollar CB"

Offline ofreen

  • Old Timer
  • ******
  • Posts: 3,890
Thanks Greg I hope your recovery is going well.  I will forever be chasing you on mileage -first thing i thought of when I turned 90K! I also have a Tourance on the VStrom - been using that model tire for 9 years and have really liked the handling in wet/dry conditions. For bigger bikes I think it works well.

Thanks, I am getting around pretty good.  Got back last night from a 2000 mile trip on the GS.  Tire made it, but it's down to the wear bars.  I settled on the Tourance after trying several others.  It is a good compromise for my use, very good on pavement, and decent on gravel and dirt.

You boys are doing enough mountain twisties! Use all yer tire  ;)

That's the ideal!  But as you know as well as anyone, it can be a long way on the straight and level to get to the twisties out here. ;)
Greg
'75 CB750F

"I would rather have questions I cannot answer than answers I cannot question." - Dr. Wei-Hock Soon

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
It’s been a few years since the front wheel axle was removed. Any tips for breaking it free?




Sent from my iPhone using Tapatalk
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline knowsnothing

  • Hot Shot
  • ***
  • Posts: 643
It’s been a few years since the front wheel axle was removed. Any tips for breaking it free?




Sent from my iPhone using Tapatalk

Bowl of Wheaties and big ass wrench
1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline MRieck

  • Really Old Timer ...
  • *******
  • Posts: 10,450
  • Big ideas....
Owner of the "Million Dollar CB"

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
You need a can of Houdini.  https://www.amazon.com/HOUD1-Houdini-Lock-Lube/dp/B00C5JFKKE/ref=sxts_sxwds-bia-wc-p13n1_0?cv_ct_cx=houdini&dchild=1&keywords=houdini&pd_rd_i=B00C5JFKKE&pd_rd_r=ccbc3
It is the bomb.

I thought you were joking till I clicked on the link. Ill give it a go as my big ass wrench isnt doing it. (thanks Treeve for the suggestion - if all else fails Ill bring it over to you with some Wheaties  8))
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline newday777

  • Old Timer
  • ******
  • Posts: 4,186
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
It’s been a few years since the front wheel axle was removed. Any tips for breaking it free?




Sent from my iPhone using Tapatalk

A deep socket and an impact wrench
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 missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Alan F.

  • We remember the Night Rider, and we know who you are.
  • Really Old Timer ...
  • *******
  • Posts: 7,227
I think last time I broke one of those loose I just used a long screwdriver through the axle and a box end wrench with a cheater pipe on the nut. I held the screwdriver in my left hand while pushing down on the wrench with my right. I had a helper tap the wrench lightly with a hammer, it didn't take long but broke free with a sharp sound.

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
Good to know Alan thank you. I was using a socket extender for the left hand hole side but a screwdriver makes more sense. I was surprised the bikes tool kit socket pole didnt fit in that hole.

Thanks Newday777 but I dont have an impact wrench.

Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,096
  • Bike almost back to the 70's 2015
Impact wrench is a good tool.
I bought a cheap electrical one ($50-60US) for car wheels to remove the Alternator bolt that sat hard. Blue Loctite helped it to sit.

The hammering wrench won after 20 sec ;) Crank on the floor, wooden plank with one person standing on it.
Correct socket followed the tool.
CB750 K6-76 1005cc JMR Billet block.
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 newday777

  • Old Timer
  • ******
  • Posts: 4,186
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
No impact..
Get a piece of pipe to slip over the end of a 1/2" drive ratchet to make it a long cheater bar. Leverage makes the difference.
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 missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

  • Old Timer
  • ******
  • Posts: 4,186
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
Andy
I just read through all 9 pages this morning...a good read and great travels. Having grown up in southern NH and outside Bangor as well as riding all around the New England from the 1970s to the present, and being stuck in San Diego where I normally just winter, I'm still trying to get back for a fall ride on my 75 that is still in storage back there from the winter's nap. I did get a 200 mile ride up to Lincoln on it last October before prepping it for it's nap. I ride the goldwing out here because of my bad back telling me after that 200 mile ride it wouldn't take the hammering of my 5,000 mile ride to San Diego.... Might be back until next spring though the way things have been going..... I miss my 750.....
But I have been working on a 74 out here off and on since January to bring it back to life for a friend. Stripped it down to paint the frame and motor and clean up the wiring. Anxious to get it back on the road for him. It was his father in law's and it got parked 33 years ago in a shed shared with rats. It's cleaning up fairly well. Frame and engine are painted, engine covers are polished and awaiting new seals and new pucks under the cam towers. The tank and side covers have cleaned up fairly well, he wants to use them for now to show his father in law it brought back to life as it was 33 years ago. Later he wants to get another tank and side covers to original and save the 70s desert scene for display(it has some flaking at the filler cap.
Anyhow hope to catch up and get some riding in with you when I get back....
Stu
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 missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

  • Old Timer
  • ******
  • Posts: 4,186
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
BTW I didn't realize the 77/78 tank was larger capacity. Always need more gas to go further....
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 missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
You need a can of Houdini.  https://www.amazon.com/HOUD1-Houdini-Lock-Lube/dp/B00C5JFKKE/ref=sxts_sxwds-bia-wc-p13n1_0?cv_ct_cx=houdini&dchild=1&keywords=houdini&pd_rd_i=B00C5JFKKE&pd_rd_r=ccbc3
It is the bomb.

Mike was right! Sprayed this on left it overnight then used a large wrench and screwdriver and hey presto it came off relatively easy without giving myself a hernia (again).

Now to balance and install.

cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
Been through this before but forgot how I solved it  :-\
All other lights work (headlight/tail, blinkers, rear brake light) - problem is the front brake light - not working. Checked the wiring in headlight and I thought it was green/white and a black wire for front brake light - and checked the wiring diagram to confirm- however no success. Anyone got better ideas? :)

Thanks
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline scottly

  • Really Old Timer ...
  • *******
  • Posts: 15,700
  • Humboldt, AZ
Re: CB750K4 - new updates 09.01.20 axle removed!
« Reply #220 on: April 13, 2024, 07:44:35 pm »
Hi Andy. I would start with the hydraulic pressure switch: there should be 12V on the black wire with the key on, and 12V on the grn/wht terminal with the brake lever pulled. If no, the switch is faulty. If yes, then the grn/wht wire has an open connection somewhere between the switch and the main harness.
You might consider removing the headlight and tail-light fuses, as well as setting the run switch to off, so as to reduce the drain on the battery while troubleshooting.
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
Re: CB750K4 - new updates 09.01.20 axle removed!
« Reply #221 on: April 14, 2024, 04:53:32 am »
Great advice thank you! Will start there as soon as I get in the garage this morning. Will update later.
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline newday777

  • Old Timer
  • ******
  • Posts: 4,186
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
Re: CB750K4 - new updates 04.14.24 Front brake switch not working
« Reply #222 on: April 14, 2024, 05:11:03 am »
It could also just be a loose wire at the brake switch.
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 missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,855
Re: CB750K4 - new updates 04.14.24 Front brake switch not working
« Reply #223 on: April 14, 2024, 08:54:14 am »
Ok found the problem and I’ll be first to say I wasn’t thinking clearly yesterday as I was in the headlight bucket looking for connectors when I should have thought how the front brake switch was working - anyway it was a loose/poor connection with the black wire at the front brake switch. In my defense it’s been a long time since I worked on the K4 as everything’s worked for so long!

Thanks Stu and Scotty for the input and making me think more clearly!

Now onto the K2 with the newly installed wire harness and why it’s not starting 😎
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline newday777

  • Old Timer
  • ******
  • Posts: 4,186
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
Re: CB750K4 - new updates 04.14.24 Front brake switch not working
« Reply #224 on: April 14, 2024, 11:02:42 am »
Glad it was an easy fix Andy.
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 missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A