CB750 K5 (1975)

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rjdoles
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Re: CB750 K5 (1975)

#16

Post by rjdoles »

tomk1960 wrote: Sun Jun 13, 2021 1:50 am Nice find! I wouldn't worry about the original motor being out of the bike unless you eventually want to bring it back to stock and make it all original At that time, you can rebuild the motor and plug it back in. The new exhausts that were still available a few years ago were genuine and not repros. I recall the price being in the $1300 range, which wasn't outrageous at the time. Not sure if they're still being sold though. I had a pristine '74 for years that was all original, including the pipes. I had my fun with it, but it began collecting more and more dust when I got hooked on my CB1100F's. So I sold it to someone who really appreciated it and we both walked away from the deal happy. Have fun.
I bought a CB750 in 1970 when I got out of the Army. I paid $1425 for it. Now a clean exhaust is almost that price. Just the time value of money I guess.
Started with an Allstate stooter made by Cushman and then a series of Honda motorcycles. 305 SuperHawk, CB750, VT600DC, VT750CD and then 4 years ago I left motorcycles for scooters with an Elite 125, Reflex 250 and Silverwing 600. Most recent is a barn find 77 GL1000 that I plan to resurect.
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Re: CB750 K5 (1975)

#17

Post by desertrefugee »

For a couple of days I was torn between keeping the café configuration that somebody went to great lengths to obtain. Seat and tail, powder coated wheels, hubs and spokes, clubman bars and rear sets(that I probably won’t use).

I have all of the very nice original takeoffs, including a very nice seat and I’m lacking only the exhaust for full original trim. But I think I’ll have a little café fun since it’s 98% ready!
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But I do have this nearly perfect Kerker! So all is not lost.
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Lucien Harpress
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Re: CB750 K5 (1975)

#18

Post by Lucien Harpress »

My brother made the mistake of riding my '72(ish) to the bike show at the Gilmore Car Museum up here in Michigan yesterday. Unfortunately (for him) he fell in love with it, and has started to shop around for one (even though I told him is probably the most expensive model).

There is definitely something about these bikes....
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.
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Re: CB750 K5 (1975)

#19

Post by desertrefugee »

Lucien Harpress wrote: Mon Jun 14, 2021 3:19 pm My brother made the mistake of riding my '72(ish) to the bike show at the Gilmore Car Museum up here in Michigan yesterday. Unfortunately (for him) he fell in love with it, and has started to shop around for one (even though I told him is probably the most expensive model).

There is definitely something about these bikes....
The '72 or early SOHC's in general?
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Lucien Harpress
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Re: CB750 K5 (1975)

#20

Post by Lucien Harpress »

Early SOHCs in general. I realize in retrospect there is quite a value difference between a '72 and say a sandcast '69.
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.
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Re: CB750 K5 (1975)

#21

Post by desertrefugee »

...ain't that the truth.
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Re: CB750 K5 (1975)

#22

Post by desertrefugee »

Well, 115F in Chandler today And the shop was up to around 84. This week is going to be a blistering heat wave and nighttime temperatures will only fall into the mid 80s. At that point, it’ll be hard to get the shop below 90. I’ve heard this song before.

However, I did get out there… About an hour and a half… And got the Kerker hung. And I will say, that as used exhaust systems go, this is one of the nicest ones I’ve come across.

But, there’s trouble in paradise! The number one exhaust port on the motor in the bike has wet carbon in it. Haven’t done a compression check, but I expect that cylinder to be dang near dead if not already dead. Might be motor time. I happen to have a few of them. In fact, this might be the opportunity for getting the original motor back in the bike.

...but I’m getting ahead of myself.
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Re: CB750 K5 (1975)

#23

Post by desertrefugee »

Sorry to keep harping on this thing, but it is the latest addition and of course is getting the most attention at the moment. Even though I'm struggling to keep the temperature in the shop below 90F, it beats the 115 outside.

Having recently come off a Hayabusa brake upgrade on my 86 Vmax, it occurred to me that the vintage motorcycles can always use help in the braking department. 750K models always had single disc front brakes. The F super sport had dual discs. Luckily, the fork tubes are the same and it's not that difficult to upgrade to dual disc.

I actually had a caliper in my bone pile and a rotor was included with extra wheels that came with this 75. I just need some lines and a right side bracket and I should be good to go!
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Last edited by desertrefugee on Sat Jun 19, 2021 10:43 pm, edited 1 time in total.
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Re: CB750 K5 (1975)

#24

Post by desertrefugee »

But the set up needs to be at least as nice as what is already there on the left side. This bike is so clean, parts that go on have to measure up!
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Re: CB750 K5 (1975)

#25

Post by Whiskerfish »

That will be a great upgrade.
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Re: CB750 K5 (1975)

#26

Post by Lucien Harpress »

My one regret about having the 750 I do- the forks were ONE year too early to be able to run that caliper mudguard/fender.

It's just a little thing, but I've always loved them.
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.
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Re: CB750 K5 (1975)

#27

Post by desertrefugee »

Still pecking away at this thing. Most of the pecking involves installing parts accumulated by the previous owners but never installed. This thing has literally been waiting to get tied together for at least 14 years, maybe more. I spoke to the PO twice removed! He had it for four years and accumulated a bunch of parts before selling it to the guy I got it from who did nothing.

Stainless socket head bolt kit. I cannot stand the JIS Phillips screws in these old Hondas. You can see that the carburetors are back on here. The guy told me they were done, but I am a bit skeptical about things like this. Turns out he was right. They were scrupulously clean. I had to do nothing. Even the float levels were spot on.
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Then there’s this tail light. I’m not really feeling the vibe on this thing, but the darn holes are already drilled in the fiberglass and it’s a triangle pattern that would be hard to cover up with anything else. I may have to learn to like this tail light.
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Re: CB750 K5 (1975)

#28

Post by Rat »

Can’t see it when you’re riding anyway ...

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Re: CB750 K5 (1975)

#29

Post by desertrefugee »

I am not normally cheap, frugal maybe, but not cheap. But on a whim, I ordered these bar end mirrors off eBay. Dirt cheap. $14 for the pair shipped!I didn’t have high hopes, but was pleasantly surprised. Sure, I could’ve paid $50 or more, but would it really have made any difference? I think not!

Really, all that’s left is to install the chain I have an order that’s due in next week and it’s time to fire this thing up. But, I don’t think I’m going to fuel up the carburetors until the weather cools off. Most of you can probably relate to that given the volatile nature of our ethanol-laced fuel these days.

It’ll be tough, but I can wait to button things up.
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Re: CB750 K5 (1975)

#30

Post by desertrefugee »

...And apologies in advance for the minuscule, incremental updates on this thing. It’s the mean season here in southern Arizona and I am bored out of my mind. Dewpoints are in the low 60s with temperatures over 100, needless to say it is not comfortable working in the shop or economical to cool it down. So I spend a very short bits of time out there at best.
- Life is not about waiting for the storms to pass. It's about learning to ride in the rain.
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