Author Topic: My CB750K2  (Read 9114 times)

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Offline newday777

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Re: My CB750K2
« Reply #25 on: May 04, 2023, 07:19:52 PM »
Amazon Castrol red rubber grease

Is it good stuff for that purpose??

Bill
Enlarge the screen shot I posted of it. It was designed for brake calipers
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 willbird

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Re: My CB750K2
« Reply #26 on: May 13, 2023, 03:27:12 PM »
Ok last weekend I ran a couple quarts of E10 87 octane with a T or two of Marvel Mystery oil in each quart. Had resigned to having to ultrasonic clean carbs but the 2 quarts seemed to smooth things up decent, runs and idles decent.

During the week I got new wiring harness made up for windjammer using a DEUTSCH connector. 50 year old vetter plug was toast.

Today was another big day, 230a alarm, 330a  work clock in, 1030 work clock out.

Pulled front wheel, pried 30 year tire off. Cleaned rim with 4.5” grinder and aggressive wire brush cup wheel. Installed new rim strip, tube, and tire. Reinstalled wheel.
Had groceries loaded in car at mao mart. Removed rear wheel, pried off 30 year old tire. Cleaned rim, installed new rim strip, tire, and tube. Reinstalled wheel, lubed chain.

Assembled front brake caliper with red rubber grease and new pads, bled front brakes. 5pm it was supper and now it is break time.

Offline denward17

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Re: My CB750K2
« Reply #27 on: May 13, 2023, 04:20:35 PM »
^That's a good day's work......

Offline willbird

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Re: My CB750K2
« Reply #28 on: May 13, 2023, 04:58:35 PM »
^That's a good day's work......

I think so :-). Left work at 10pm Friday night too, clocked back in at 330a and we got some stuff done :-).

The 30 year old front tire kicked my *ss lol, glad I did that part first :-). I put it on 30 years ago but darned if I remember any details. Kinda remember putting the rear on back then because it was double some weird stuff not wanting to center up on the rim very well.

I’d like to build or have built a set up aluminum rims spoked like original.

Bill

Bill

Offline newday777

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Re: My CB750K2
« Reply #29 on: May 13, 2023, 06:38:26 PM »
I'm with you Bill. I was eying my friend's GB500 the other day with aluminum rims......
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 HondaMan

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Re: My CB750K2
« Reply #30 on: May 13, 2023, 07:38:13 PM »
Ok last weekend I ran a couple quarts of E10 87 octane with a T or two of Marvel Mystery oil in each quart. Had resigned to having to ultrasonic clean carbs but the 2 quarts seemed to smooth things up decent, runs and idles decent.

During the week I got new wiring harness made up for windjammer using a DEUTSCH connector. 50 year old vetter plug was toast.

Today was another big day, 230a alarm, 330a  work clock in, 1030 work clock out.

Pulled front wheel, pried 30 year tire off. Cleaned rim with 4.5” grinder and aggressive wire brush cup wheel. Installed new rim strip, tube, and tire. Reinstalled wheel.
Had groceries loaded in car at mao mart. Removed rear wheel, pried off 30 year old tire. Cleaned rim, installed new rim strip, tire, and tube. Reinstalled wheel, lubed chain.

Assembled front brake caliper with red rubber grease and new pads, bled front brakes. 5pm it was supper and now it is break time.

Did you know that you can still get the Vetter electrical stuff? I replaced mine a few years back, it still had the original 1972 6-pole connector it came with. At the 'Jammer II this became the more common 9-pole version.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline willbird

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Re: My CB750K2
« Reply #31 on: May 14, 2023, 07:08:21 AM »
Ok last weekend I ran a couple quarts of E10 87 octane with a T or two of Marvel Mystery oil in each quart. Had resigned to having to ultrasonic clean carbs but the 2 quarts seemed to smooth things up decent, runs and idles decent.

During the week I got new wiring harness made up for windjammer using a DEUTSCH connector. 50 year old vetter plug was toast.

Today was another big day, 230a alarm, 330a  work clock in, 1030 work clock out.

Pulled front wheel, pried 30 year tire off. Cleaned rim with 4.5” grinder and aggressive wire brush cup wheel. Installed new rim strip, tube, and tire. Reinstalled wheel.
Had groceries loaded in car at mao mart. Removed rear wheel, pried off 30 year old tire. Cleaned rim, installed new rim strip, tire, and tube. Reinstalled wheel, lubed chain.

Assembled front brake caliper with red rubber grease and new pads, bled front brakes. 5pm it was supper and now it is break time.

Did you know that you can still get the Vetter electrical stuff? I replaced mine a few years back, it still had the original 1972 6-pole connector it came with. At the 'Jammer II this became the more common 9-pole version.

I found a webpage that listed some stuff but all of it was out of stock. The Deutsch stuff is SO nice, there is no comparison :-).




So many nice features to those connectors, being able to easily remove a wire and terminal for example. I bought a kit of 10' wire colors from amazon, used Lavender for RH turn signal to avoid ordering light blue by itself, but I can easily sub in a light blue wire later on.

These crimpers work OK, I have a better set on order at work using my annual tool allowance, the crimp tool buy in is the worst part of Deutsch, the actual Deutstch brand tool is like $300...the pretty good knock off on order is $180, the one linked is $40.

https://www.amazon.com/dp/B0BKVCQJY7?psc=1&ref=ppx_yo2ov_dt_b_product_details

Wiregarage has High Temp GXL Cross-Link XLPE Stranded Wire which is some really nice stuff.

Still waiting on 3.5mm crimp on bullets, I think I am going to butt splice onto the old wires for now.

Offline willbird

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Re: My CB750K2
« Reply #32 on: May 14, 2023, 02:30:32 PM »
Installed new supposedly genuine Honda fuel petcock using two fiber washers from EBay and new button head stainless M6x1.0 screws. Installed new fuel lines.

Wired bike side of the new windjammer plug. Just did a temporary job using domestic crimp on bullets to join the original bullet connector until the correct 3.5mm connectors come.

Added fuel, turned on petcock. Oops we have a leak due to improper 1/4” fuel line. Only leak was at petcock on one line. Ordered proper 5.5mm line. Used a zip tie for today.

Fired up and rode up town and filled fuel tank.

Not running quite right yet but did run around the mile square about 12 miles worth. Not idling properly and part throttle is rough. WOT flat out in Mexico hit 90, normal is 100 with the jammer.

Oil pressure light works, neutral, high, and turn indicators not working. Turn signals no flash too. Quickly subbed in a new “led flasher” still no flash, turn signal lights just solid on. Still have incandescent bulbs but had bought the LED flasher thinking I wanted to install LED bulbs.

Need to review the wiring diagram a bit.

Pulled sediment bowl and it was immaculate so the tank cleaning was a success. Left it empty, will check it tmw to see if anything is leaking past shut off petcock.

Offline willbird

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Re: My CB750K2
« Reply #33 on: May 15, 2023, 04:09:19 AM »
Went back out later to tinker a little more. Checked and cleaned pilot jets, one float valve was stuck closed. Freed it, runs a lot better but still not 100%. Quick trip to mexico netted 100mph flat out so nothing seriously wrong overall. That float needle it's spring loaded tip is seized so ordered new genuine Honda flat valves. Going to dig into wiring this week.

Offline Stev-o

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Re: My CB750K2
« Reply #34 on: May 15, 2023, 07:21:50 AM »
Quick trip to mexico netted 100mph flat out...

Mexico?!
'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: My CB750K2
« Reply #35 on: May 15, 2023, 08:35:07 AM »
Quick trip to mexico netted 100mph flat out...

Mexico?!

No speed limits in Mexico LOL.

Offline willbird

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Re: My CB750K2
« Reply #36 on: May 15, 2023, 08:38:46 AM »
Made up a test harness to allow checking vetter wiring with jammer removed.









Got the high beam indicator working and the turn signal indicator working on the top clamp. Still no Neutral light. Still no flash with turn signals on. I had bought new "repro" controls but they are just crap quality wise, cannot see using them.

Bill

Offline willbird

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Re: My CB750K2
« Reply #37 on: May 15, 2023, 09:26:31 AM »
Reminding myself to make sure the neutral indicator bulb is not burned out ;-).

Offline willbird

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Re: My CB750K2
« Reply #38 on: May 15, 2023, 08:30:48 PM »
Reminding myself to make sure the neutral indicator bulb is not burned out ;-).

Indeed bulb is bad. And on the turn signals after some head scratching I discovered that the control is an aftermarket one with a mystery second button fastened to the bottom of it, and when you hold down that button THEN the turn signals flash. reading a few other threads here led me to unplug the flasher and discover that the turn signal bulbs still lit meaning circuit was getting 12VDC from somewhere other than the flasher. That control has TWO grey wires, unplugging the extra one lets the turn signals work as they should.

Offline willbird

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Re: My CB750K2
« Reply #39 on: May 16, 2023, 11:40:45 AM »
New bulb, cleaned bulb socket and neutral light works now :-)

Offline Stev-o

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Re: My CB750K2
« Reply #40 on: May 16, 2023, 12:50:47 PM »
New bulb, cleaned bulb socket and neutral light works now :-)

Dont ya like those easy fixes?!

The border towns are a little crazy these days, mind if I ask where are you crossing? [just curious]
'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: My CB750K2
« Reply #41 on: May 16, 2023, 03:24:35 PM »
New bulb, cleaned bulb socket and neutral light works now :-)

Dont ya like those easy fixes?!

The border towns are a little crazy these days, mind if I ask where are you crossing? [just curious]

Well I live in the NW corner of OH, IN and MI are only 10 miles away so the trip to Mexico is strictly a mental one LOL. Referring to testing in Mexico is a YouTube kinda inside joke :-).

Offline willbird

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Re: My CB750K2
« Reply #42 on: May 16, 2023, 03:26:43 PM »
So looking at wiring diagram the mystery button that never seemed to do anything must be intended to silence the turn signal beeper that has never been present since the 1970's.

Offline Stev-o

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Re: My CB750K2
« Reply #43 on: May 17, 2023, 06:57:40 AM »
New bulb, cleaned bulb socket and neutral light works now :-)

Dont ya like those easy fixes?!

The border towns are a little crazy these days, mind if I ask where are you crossing? [just curious]

Well I live in the NW corner of OH, IN and MI are only 10 miles away so the trip to Mexico is strictly a mental one LOL. Referring to testing in Mexico is a YouTube kinda inside joke :-).

Got it..ha!   Been to your part of the country on a bike trip years ago, stopped at the Indiana Dunes for a rest on the sand...was really beautiful.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline seanbarney41

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Re: My CB750K2
« Reply #44 on: May 17, 2023, 07:24:55 PM »
So looking at wiring diagram the mystery button that never seemed to do anything must be intended to silence the turn signal beeper that has never been present since the 1970's.
yeah, that button is unique to k2 bikes
If it works good, it looks good...

Online PeWe

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Re: My CB750K2
« Reply #45 on: May 17, 2023, 11:30:07 PM »
Beeper for turn signal on is very practical. It was the first thing I removed on my K6 after purchase. I have missed it many times when forgetting the blinker on, cars will drive just in front of me, many very close moments.
Frequent check of blinkers off to avoid collisions will take 2-3 sec of my control when riding.

My K2 got that left hand control. My K6 never had the off button.
Buzzer off while pressing. Cars in front of me hear the signal and wonder what that is. Practical to press the button.
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 willbird

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Re: My CB750K2
« Reply #46 on: May 18, 2023, 04:16:36 AM »
Beeper for turn signal on is very practical. It was the first thing I removed on my K6 after purchase. I have missed it many times when forgetting the blinker on, cars will drive just in front of me, many very close moments.
Frequent check of blinkers off to avoid collisions will take 2-3 sec of my control when riding.

My K2 got that left hand control. My K6 never had the off button.
Buzzer off while pressing. Cars in front of me hear the signal and wonder what that is. Practical to press the button.

I can remember hearing that beeper go when my dad pulled into the driveway when I was a kid.

Bill

Offline MauiK3

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Re: My CB750K2
« Reply #47 on: May 18, 2023, 07:40:34 AM »
I moved mine into the headlight can, just loud enough to remind me.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline willbird

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Re: My CB750K2
« Reply #48 on: May 18, 2023, 04:06:15 PM »
New 5.5mm fuel line arrived yesterday, and an Amazon ignition switch. Installed fuel lines, all good there. Ignition switch was not correctly wired. Tail lights worked when switch was set to park but on “ignition” headlight didn’t work. I just soldered a wire from black to the other two wires meaning the switch connects red to the other 3 wires. Switch works.

Bike still not running quite right. Has something like a miss cruising at 4K rpm. Only way to describe it is it seems like every now and then a cyl does not fire and there is a pop in exhaust. Seems great WOT. I have new genuine Honda #40 slow jets coming and genuine Honda float valves. At least one float valve the spring loaded plunger was locked up.

Also have new eBay 5ish ohm coils that take plug on wires, and new genuine spark plug caps, need to get to NAPA to get copper core wire and the terminals and boots for the coil end of the wires.

Kind of want to work through things one at a time to solve the miss or whatever it is rather than throw a bushel of parts at once.

When the slow jets and float valves come I’ll put those in, and pull main jet emulsion tubes and make sure they are clean. Had cleaned slow jets already. No sense in using clear tube to check float levels til new float valves are in.

Points and condensors are Honda parts from the early 90's, they look nice, gap is correct.
« Last Edit: May 19, 2023, 07:53:30 AM by willbird »

Offline willbird

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Re: My CB750K2
« Reply #49 on: May 19, 2023, 07:17:51 AM »
Ordered some copper core plug wire, distributer terminals, and boots from NAPA online. The local store does not stock any of that stuff anymore. $23 for 10' of wire, 8 terminals, and 8 boots