CB750 K0/K1 Hybrid
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- salukispeed
- Platinum Member
- Posts: 1951
- Joined: Sun Feb 21, 2010 10:08 am
- Location: Oak Forest Illinois US
Re: CB750 K2- Closer, and Farther
Bend them "slowly" and possibly use a hair drier to heat them up to make them more flexible while you get them in place
Honda 72 CL100 sold
74 CB750 K4 nice driver
1966 CA77/305 Dream nostalgic driver
84 GL1200I work in progress
1970 CT 70
1982 GL500 Interstate
74 CB750 K4 nice driver
1966 CA77/305 Dream nostalgic driver
84 GL1200I work in progress
1970 CT 70
1982 GL500 Interstate
- Track T 2411
- Honored Life Member
- Posts: 8482
- Joined: Thu May 29, 2008 9:37 pm
- My Album: http://www.ngwclub.com/gallery/v/wingmans/Track+T+2411/
- Location: Prairie du Sac Wisconsin
Re: CB750 K2- Closer, and Farther
A little bit of this, and a little bit of that, and soon you'll have another motorcycle!
"I have no special talent. I am only passionately curious." - Albert Einstein
"He that is good with a hammer tends to think everything is a nail" - Abraham Maslow
"If you can't take the time to do it right the first time, how are you ever going to find the time to do it over?" -Unknown
Current Rides:
'Grumpy' - '81 Standard, now fully dressed.
'Layla' - '81 Standard w/dealer installed fairing and Hondaline bags.
'Scarlett' '76 'Survivor' nekkid as a j-bird!
Under Construction:
The 'Jalopy' '78-'79 Mash-up
'Quikie' '81 gl1100I back on the lift, project with the step-son!
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson!
New2U Bike? Read Me.
"He that is good with a hammer tends to think everything is a nail" - Abraham Maslow
"If you can't take the time to do it right the first time, how are you ever going to find the time to do it over?" -Unknown
Current Rides:
'Grumpy' - '81 Standard, now fully dressed.
'Layla' - '81 Standard w/dealer installed fairing and Hondaline bags.
'Scarlett' '76 'Survivor' nekkid as a j-bird!
Under Construction:
The 'Jalopy' '78-'79 Mash-up
'Quikie' '81 gl1100I back on the lift, project with the step-son!
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson!
New2U Bike? Read Me.
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- Closer, and Farther
You want to know the best part of getting all the wiring back on and connected back up in the bucket?
Wires left over that don't go anywhere.
....
Just thought you might like to know. (I'll grab a wiring diagram and get back with you.)
Wires left over that don't go anywhere.
....
Just thought you might like to know. (I'll grab a wiring diagram and get back with you.)
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- Closer, and Farther
So, update. In no particular order....
-Managed to mis-match a wire or two. Apparently colors are hard. (And I have an Art degree, for gosh sakes...)
-Think I shot myself in the foot with the turn buzzer- it didn't come from a 750, so the wire colors are wrong.
-Still have a brown wire coming out of the main harness I can't match up. Stay tuned.
-My battery is pretty much confirmed trashed.
HOWEVER- I ran some jumper cables from my leads to my Jeep's battery, and was able to confirm that the following works:
-Headlight
-Idiot Light(s)
-Right controls
-Turn signals/left controls
-STARTER MOTOR
Once I get a battery that works I'll get some extra plugs and make sure the coils are sparking as well, but so far so good.
-Managed to mis-match a wire or two. Apparently colors are hard. (And I have an Art degree, for gosh sakes...)
-Think I shot myself in the foot with the turn buzzer- it didn't come from a 750, so the wire colors are wrong.
-Still have a brown wire coming out of the main harness I can't match up. Stay tuned.
-My battery is pretty much confirmed trashed.
HOWEVER- I ran some jumper cables from my leads to my Jeep's battery, and was able to confirm that the following works:
-Headlight
-Idiot Light(s)
-Right controls
-Turn signals/left controls
-STARTER MOTOR
Once I get a battery that works I'll get some extra plugs and make sure the coils are sparking as well, but so far so good.
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- Checklist
Got some packages in the mail today. Namely a throttle cable:
...and header clamp.
So what do I still need before I try to start this puppy? Air filter, oil filter, fluids, and a battery, at minimum.
I'm allowing myself to get excited.
...and header clamp.
So what do I still need before I try to start this puppy? Air filter, oil filter, fluids, and a battery, at minimum.
I'm allowing myself to get excited.
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
- desertrefugee
- SUPER BIKER!!!!
- Posts: 3947
- Joined: Fri Nov 11, 2011 9:33 pm
- Location: Chandler, AZ, USA
Re: CB750 K2- Checklist
Make sure there's water in the radiator.
. . . Gas, oil, spark.
. . . Gas, oil, spark.
- Life is not about waiting for the storms to pass. It's about learning to ride in the rain.
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- Checklist
...I mean, I suppose I could wait until it starts raining or something......desertrefugee wrote:Make sure there's water in the radiator.
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
-
- Silver Member
- Posts: 796
- Joined: Sun Jul 27, 2014 5:08 pm
- Location: Indiana
Re: CB750 K2- Checklist
Make sure the clutch plates aren't stuck. If you can put it into gear but still be able to push the bike with it in gear and the clutch lever pulled in you should be OK. I had a 73 cb750 that sat for 20+ years and it's clutch plates had gotten stuck together from setting for so long, once the bike was initially up and running it would jump and die the moment I'd try to put it in gear. I didn't have to replace anything but I did have to disassemble the clutch and lube all its plates before reassembling.
Scott
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- Checklist
Clutch plates are DEFINITELY frozen. If I remember correctly, you need a special tool to get the clutch plates out. The good news is that I already had to buy one for my CT90, and I'm fairly certain it's the same size.
Assuming the motor runs, that opens up a whole new set of things to fix to actually get it roadworthy. In no particular order...
-Clutch plates frozen
-ENTIRE front brake (from master cylinder to caliper) needs cleaned or replaced
-Drive chain
-Everything rearwards of the battery needs wired
-Front forks need rebuilt, including seals, fluid, and possibly replacing the downtubes
-Gas tank de-rusted and checked for pinholes (AND new petcock)
-Tires
But, hopefully I can put that off. First thing's first- get running, then move on.
Assuming the motor runs, that opens up a whole new set of things to fix to actually get it roadworthy. In no particular order...
-Clutch plates frozen
-ENTIRE front brake (from master cylinder to caliper) needs cleaned or replaced
-Drive chain
-Everything rearwards of the battery needs wired
-Front forks need rebuilt, including seals, fluid, and possibly replacing the downtubes
-Gas tank de-rusted and checked for pinholes (AND new petcock)
-Tires
But, hopefully I can put that off. First thing's first- get running, then move on.
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
-
- Silver Member
- Posts: 796
- Joined: Sun Jul 27, 2014 5:08 pm
- Location: Indiana
Re: CB750 K2- Checklist
That's precisely the thought process I have when messing with a bike that hasn't ran in years, I resist buying any parts until I've heard it run first. Yeah you'll need a special socket to get the clutch apart, if the one you purchased for the CT90 doesn't work you can make your own if you have the patience, I'll dig around later on to find mine to see what size socket I used. You may already be aware of all this but I'm letting you know to make sure you know so you don't run into any headaches. To start out with (after you're satisfied with how the engine sounds) make sure you're very patient with that cast aluminum pressure plate on the clutch because it can snap real easy, don't ask me how I know. I loosen the bolts that secure it 1 full turn at a time and install them 1 full turn at a time as well, it's kind of time consuming but I haven't snapped another one since I learned my lesson on the first one I broke. Also there is a concave/convex washer behind it all, make sure you have it facing the right direction when installing or you may not be able to get into 5th gear when done. It sounds crazy I know but there is a member on the 750 site I visit who's 750 had no 5th gear since he bought it, he even split the cases and installed another trans and still no 5th gear. It wasn't until one of the experts on the site questioned him about that washer, it turned out the owner had been reinstalling that washer the same way he had taken it apart assuming it had already been positioned correctly in the first place but it turned out it was the previous owner that had it installed wrong. Once it was determined it was facing the wrong way the owner pulled the clutch apart, installed that washer correctly, got it all back together and viola, his 750 now had 5th gear.Lucien Harpress wrote: First thing's first- get running, then move on.
Scott
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- IT LIVES!!!! ...a bit
I finally got my battery in the mail today, so I figured I'd pop it in and see what works. To my surprise, the answer was "quite a bit". Horn, lights, starter motor, blinkers, etc. I popped a spare spark plug on one of the plug wires- no spark.
Just for fun, I pulled the points cover and gave the points a good swipe with some sandpaper. I checked again, and was rewarded with that sweet, sweet little blue blinkey light.
Time for an experiment.
I grabbed a bit of starter fluid, took apart the airbox, shot some into the carbs, and hit the starter button again- and that thing, however briefly, ran under its' own power for the first time in probably decades.
Time for another experiment.
I have a aux. fuel bottle "IV" tank. The only problem is that this model of CB750 has two fuel inlets, one for carbs 1 and 2, the other for 3 and 4. Well, I don't have a splitter (yet), so I did the best I could to at least fill up all 4 carb bowls by swapping the line back and forth. After I was happy I hit the starter again, and managed to get a decent 1-2 minutes of continuous runtime.
After my happy dance was done I figured I was only hitting on 3 cylinders, but that's 3 more than I was expecting. One I get a more solid fuel delivery setup I can troubleshoot, but hearing that puppy roar to life was like music to my ears.
Watch this space! I'll be to sure to have updates, and maybe a video or two.....
Just for fun, I pulled the points cover and gave the points a good swipe with some sandpaper. I checked again, and was rewarded with that sweet, sweet little blue blinkey light.
Time for an experiment.
I grabbed a bit of starter fluid, took apart the airbox, shot some into the carbs, and hit the starter button again- and that thing, however briefly, ran under its' own power for the first time in probably decades.
Time for another experiment.
I have a aux. fuel bottle "IV" tank. The only problem is that this model of CB750 has two fuel inlets, one for carbs 1 and 2, the other for 3 and 4. Well, I don't have a splitter (yet), so I did the best I could to at least fill up all 4 carb bowls by swapping the line back and forth. After I was happy I hit the starter again, and managed to get a decent 1-2 minutes of continuous runtime.
After my happy dance was done I figured I was only hitting on 3 cylinders, but that's 3 more than I was expecting. One I get a more solid fuel delivery setup I can troubleshoot, but hearing that puppy roar to life was like music to my ears.
Watch this space! I'll be to sure to have updates, and maybe a video or two.....
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
- Easter
- True Blue Steel Biker
- Posts: 2999
- Joined: Thu Sep 13, 2012 11:33 am
- Location: South of Houston 100 miles
Re: CB750 K2- IT LIVES!!!! ...a bit
Congratulations. Just remember to go easy with the starter fluid. I still use it but I set a CB900 on fire a while back.
Bikes at present:
83 XL 600r with a 2004 XR650L engine
And a slightly worse for the wear BMW GS adventure bike awaiting repair
83 GL in process
83 XL 600r with a 2004 XR650L engine
And a slightly worse for the wear BMW GS adventure bike awaiting repair
83 GL in process
- desertrefugee
- SUPER BIKER!!!!
- Posts: 3947
- Joined: Fri Nov 11, 2011 9:33 pm
- Location: Chandler, AZ, USA
Re: CB750 K2- IT LIVES!!!! ...a bit
...and I severely wounded a GS1000 several decades ago. I've never used ether-based starting fluids since.
- Life is not about waiting for the storms to pass. It's about learning to ride in the rain.
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- IT LIVES!!!! ...a bit
So, I managed to rig up a fuel delivery system better than what I had, and was able to do a bit more futzing around with this bike. The bad news? Part of the reason I have a dead(ish) cylinder is that I've got some kind of stuck/high float on carb 4. Thankfully these carbs come with an overflow. Unfortunately I don't have a tube linked to it yet, so it was just dumping gas right on the engine block. Got that shut down REAL quick.
On the upside though, I've got spark, I've got compression, and once the bowls drained down a bit I got, well, THIS.
https://youtu.be/2cBX8Uvvgf8
Not bad for something that's been sitting in a collapsed barn for 20 years.
On the upside though, I've got spark, I've got compression, and once the bowls drained down a bit I got, well, THIS.
https://youtu.be/2cBX8Uvvgf8
Not bad for something that's been sitting in a collapsed barn for 20 years.
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
- Lucien Harpress
- Honored Life Member
- Posts: 4077
- Joined: Sat Dec 24, 2011 11:41 am
- Location: Michigan
Re: CB750 K2- IT LIVES!!!! (Now with 100% more video)
Figured out why my number 4 carb was flooding. Someone had stomped on the float tab, smashing into the full "open" position. Five minutes later had it bent back to the correct angle. The best part? The combination of the carb location and the simple spring clip holding the bowl on meant I could fix the problem right on the bike!
The (sad) verdict?
Doing next to nothing, this hunk of barn find probably runs better than most of the stuff I own.
Next up? Find me a drive chain and see if I can bust the clutch plates loose without tearing more apart.
The (sad) verdict?
Doing next to nothing, this hunk of barn find probably runs better than most of the stuff I own.
Next up? Find me a drive chain and see if I can bust the clutch plates loose without tearing more apart.
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
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