Author Topic: 1976 Honda cb750K  (Read 26323 times)

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Offline denward17

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Re: 1976 Honda cb750K
« Reply #300 on: January 23, 2024, 01:18:18 PM »
Never noticed the foot pegs, hmmm.

That's going to be one clean bike!

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #301 on: January 23, 2024, 05:59:01 PM »
Never noticed the foot pegs, hmmm.

That's going to be one clean bike!

Thanks Dennis. Trying NOT to rush and enjoying the journey! This bike had a single stay 1977/78 front fender fitted when I picked it up, and one of the pipes had a really nasty patch plate welded on it…… I’ve found replacements for those two parts, but otherwise 99% of the bits are original. A lucky “survivor” that saw little use and has always been kept in doors…..

“Lash” replaced bearings, pistons, rings and valves in the engine, so this one might run for another 50 years!
« Last Edit: January 24, 2024, 08:16:51 AM by BenelliSEI »

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #302 on: January 24, 2024, 12:13:13 PM »
A bit of progress today.

Here’s a laugh. The tach cable wouldn’t push in far enough. Drove in a drywall screw and sure enough, pulled out two seals. Without thinking, pushed in my ONLY new one…… Guess what? There must be another one in there!
« Last Edit: January 24, 2024, 02:18:56 PM by BenelliSEI »

Offline PeWe

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Re: 1976 Honda cb750K
« Reply #303 on: January 24, 2024, 12:20:24 PM »
Another looking like new bike is born! ;D
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 denward17

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Re: 1976 Honda cb750K
« Reply #304 on: January 24, 2024, 12:44:12 PM »
Those tach seals are hard to see....My 550 didn't have one installed, no wonder it leaked..

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #305 on: January 24, 2024, 02:14:04 PM »
Those tach seals are hard to see....My 550 didn't have one installed, no wonder it leaked..

I have to dig the new one out and see what’s in there. That chrome cam cover was on a chopper and didn’t have a tach drive gear. I put one in. Need to sort this before I go any further……

Per…..Thanks! It’s moving along.
« Last Edit: January 24, 2024, 02:20:23 PM by BenelliSEI »

Offline MauiK3

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Re: 1976 Honda cb750K
« Reply #306 on: January 25, 2024, 06:45:19 AM »
Ouch, hate it when that happens.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #307 on: January 25, 2024, 02:05:26 PM »
Sorted the tach seal today. Installed all the engine mounts. Oil tank and lines are in too. “Lash” vapour blasted all the covers and they look good. I think I’ll pull them all and try for a high polish. The sprocket cover I got from EBay (thank you Dave at Bobco) arrived today too. Next I’ll have to find a kick start lever and shifter without “borrowing” from the Rickman or the Sandcast project piles!
« Last Edit: January 25, 2024, 02:19:19 PM by BenelliSEI »

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #308 on: January 26, 2024, 12:57:36 PM »
Removed the sprocket, transmission, alternator and clutch covers. Cleaned off the oil and am handing them off to a local guy that polishes aluminum. “Greg’s Metal Grinding and Polishing” in Oshawa, Ontario. Does fantastic work and reasonable charges.
« Last Edit: January 26, 2024, 01:06:50 PM by BenelliSEI »

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #309 on: January 26, 2024, 01:05:21 PM »
Test fitted exhaust spigots and #4 pipe. Stopped into a local shop (Bolts+) and picked up a fantastic substitute fastener for the 8 screws that hold in the exhaust spigots. These stainless screws have the same dimensions as the Honda parts and are screwed in with an Allen key!

I believe the head on this engine is from a K7/8. Those pipes are fastened in place with 8 studs instead of the screws. The “posts” that are drilled and tapped for the studs are slightly shorter than the earlier heads. I also picked up 8 screws that are 8mm longer and they will work perfectly.

Offline denward17

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Re: 1976 Honda cb750K
« Reply #310 on: January 26, 2024, 01:33:13 PM »
Can't wait to see those covers when complete...

Offline newday777

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Re: 1976 Honda cb750K
« Reply #311 on: January 26, 2024, 01:39:26 PM »
Removed the sprocket, transmission, alternator and clutch covers. Cleaned off the oil and am handing them off to a local guy that polishes aluminum. “Greg’s Metal Grinding and Polishing” in Oshawa, Ontario. Does fantastic work and reasonable charges.
I'm interested to know how much as I might polish some sets of covers.
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 BenelliSEI

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Re: 1976 Honda cb750K
« Reply #312 on: January 26, 2024, 02:59:05 PM »
Removed the sprocket, transmission, alternator and clutch covers. Cleaned off the oil and am handing them off to a local guy that polishes aluminum. “Greg’s Metal Grinding and Polishing” in Oshawa, Ontario. Does fantastic work and reasonable charges.
I'm interested to know how much as I might polish some sets of covers.

Stu…. I just got off the phone with Greg. He and his son both work at General Motors in Oshawa and have this part time business. He does lots of polishing on “Big Rigs” in the good weather and also copper and brass for a few local antique shops as well. I asked what he’s working on and he has “nothing on his bench”. I’ll be headed there first thing tomorrow! Pictures and pricing when he’s done.
« Last Edit: January 26, 2024, 03:01:56 PM by BenelliSEI »

Offline lash

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Re: 1976 Honda cb750K
« Reply #313 on: January 26, 2024, 03:06:55 PM »
Can he take chrome off of aluminum? Anybody know a way I can do it? This 74 engine I’m taking apart has a chromed alternator cover which is no bueno..
« Last Edit: January 26, 2024, 03:10:19 PM by lash »
Analog mind in a digital world..

Offline newday777

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Re: 1976 Honda cb750K
« Reply #314 on: January 26, 2024, 03:18:03 PM »
Can he take chrome off of aluminum? Anybody know a way I can do it? This 74 engine I’m taking apart has a chromed alternator cover which is no bueno..
You need to take it to a chrome shop to have them dip it to remove the chrome.

BTW I looked I to this already as I have some chrome covers too.....
« Last Edit: January 26, 2024, 03:19:37 PM 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 lash

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Re: 1976 Honda cb750K
« Reply #315 on: January 26, 2024, 03:28:19 PM »
I only have two kidneys and don’t really want to give a chrome shop one of them so I guess I’ll have to find another cover!
Analog mind in a digital world..

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #316 on: January 26, 2024, 04:36:57 PM »
Can he take chrome off of aluminum? Anybody know a way I can do it? This 74 engine I’m taking apart has a chromed alternator cover which is no bueno..

I’ll ask him tomorrow when I visit. The boys at GM have their ways to get a lot of weird stuff done!

Offline PeWe

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Re: 1976 Honda cb750K
« Reply #317 on: January 26, 2024, 09:53:19 PM »
I also use allen head bolts for exhaust spigots.
Easier to tighten and remove than stock chromed ones.
Mine a few mm longer than the short stock. Used with K2 and K6 head.
My K6 has a K7 head (392), countersunk allen heads holds the spigots for Hindle 4-2-1.  Easier to retighten afterwards when everything sit. There are Allen keys that can be used in an angle.



I found other countersunk allen heads for the bearing holder of the gearbox shaft inside left side cover.

The old stock x-heads pigs to remove (drilled the heads off) 40 years ago so allen heads were used.

When I did my oil pump restorations the 2 longer bolts replaced by allen heads. Original 58mm long, found 60mm with countersunk allen heads in really hard steel on eBay UK.
So a bench grinder purchased to shorten them. Have had good used of it for other things too. ;)

Too long will hit the sprocket.
The other bolts hex heads.
« Last Edit: January 27, 2024, 10:33:31 AM by PeWe »
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 BenelliSEI

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Re: 1976 Honda cb750K
« Reply #318 on: January 27, 2024, 06:16:34 AM »
Per….. good choices. I’m never satisfied the spigots are snug, straight and have crushed the copper seals properly. These will make the job so much easier and neater! They are stainless too. Lot’s of anti-seize and they should last forever.
« Last Edit: January 27, 2024, 06:18:09 AM by BenelliSEI »

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #319 on: January 27, 2024, 03:13:44 PM »
Delivered the engine covers to the polisher this morning. Greg had no work lined up, so I really hustled to get them over to him. A few of you asked me to detail the generator cover removal and I have to apologize for the lack of photos. Before you start, drain any oil from the crankcase or it will pour out when you pull the trans cover. If you are working on the side stand, most of that oil will be on the opposite side, so don’t bother.  Keep an oil pan under both covers.Here’s what I did:

1. Knock all the Philips head screws loose a turn with a hand held impact tool. Don’t forget the three around the “HONDA” script on the alternator. They hold the fixed centre (#1 in the photo).
2. Remove the two screws and pull off the sprocket cover.
3. Pull out all the screws out of the transmission cover and remove it. You can start tapping it loose at the back (the part visible when you removed the sprocket cover). You will notice a wire harness that comes from the alternator. It also includes the single wires from the neutral switch, oil pressure switch and the bigger one that feeds the starter motor from the solenoid. They can be left there for now. The trans cover comes off without them. Inspect the transmission cover. It has two hollow dowel pins in two of the screw holes. If they are loose, remove them. If they are stuck in the case or the cover, just leave them there. If the gasket tears apart you will have to clean off both faces and replace it. Get a new one ahead of time.
4. Remove the starter motor cover so you can see the two wires that go in there. I usually unscrew the wire eyelets from the neutral switch (bottom of the crankcase)  and oil pressure switch so they can come away freely when you pull the alternator.
5. Remove all the alternator cover screws and and pull the cover off. There is one spot to pry at in the lower front. Take note of the starter motor spur gears in the top right corner (#4 in the parts photo). If it falls out, don’t worry. All the wires will come with it and it will also drip a small amount of oil. Sit the “pot” on the bench so you can look inside. Note: it has a single hollow dowel. Treat the same as those in the trans cover. Don’t lose it. The alternator also has a gasket. Save it if you can. Replace if torn or damaged.
6. #3 in the parts photo is a clip that secures the wires in the housing. Take a picture of how everything sits and take out the clip. Below the clip, all the wires are held in a rubber block. Gently pull it out with the encased wires. Part #2 is held in by four Philips head screws around the perimeter. They are oddly threaded 1/2 into the case AND 1/2 into the part #2. The only way to get these loose is with the hand held impact driver. Get a partner to hold the case steady on a good bench and hit it square. They MUST come out cleanly. There is no drilling them out! You’ll see why when they are out. Once they are removed the ring will lift straight up and away.
7. The centre ring (part #1 in the photo) is held in by the three screws around the “HONDA” script. Remove them from the outside, and take it out. Mark (Hondaman) suggests there are small copper washers under these screw heads. I never noticed, and in my rush forgot to check today…..

Questions?
« Last Edit: January 28, 2024, 08:42:50 AM by BenelliSEI »

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #320 on: January 27, 2024, 03:28:12 PM »
This photo shows the engine with the covers and wiring removed. The starter motor spur gears are slipped back in place (part #4 in previous photo). The two gears are one piece. The hollow shaft just pushes in. The large, very thin, flat washer goes on the outside. It often sticks to the oily cover and then disappears. I have opened up more than one engine and found it missing. Don’t loose it, they are a hard part to find! Questions?

Apologies for the lack of photos, I’ll take a bunch and detail the reassembly.
« Last Edit: January 27, 2024, 07:54:50 PM by BenelliSEI »

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #321 on: January 27, 2024, 03:37:08 PM »
Got the four spigots installed in the head today. The new hardware worked perfectly. Made sure they were spotlessly clean and rust free (inside and out) so the pipes will slide in freely, all the way.

After degreasing yesterday, they spent the night in phosphoric acid mix to get any rust out and then scraped and sanded the ID, before install.
« Last Edit: January 27, 2024, 05:49:01 PM by BenelliSEI »

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #322 on: January 27, 2024, 05:45:44 PM »
Test fitted one pipe and looks good. Cleaning up a good set of pipes next.

Offline BenelliSEI

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Re: 1976 Honda cb750K
« Reply #323 on: January 27, 2024, 07:59:35 PM »
Greg (the polisher) just texted me a photo of my sprocket cover. It’s the one I got from Bobco and was stained and corroded. I should have taken a “before” picture!
« Last Edit: January 27, 2024, 08:01:13 PM by BenelliSEI »

Offline newday777

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Re: 1976 Honda cb750K
« Reply #324 on: January 27, 2024, 08:03:40 PM »
Purdy 😊
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