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SOHC.co.uk Forums => Project Board => Topic started by: Honda enthusiast on August 02, 2023, 10:15:54 AM

Title: CB750K7 resto
Post by: Honda enthusiast on August 02, 2023, 10:15:54 AM

Hi folks

I've decided to start on my K7...it's an American import with some scabby engine paint and rusty frame along with a loud Delkevic four into one. The chrome is very good for its age too good to send away for redoing and the previous owner had done the paint which is well finished but slightly lighter and more purple than standard. I might just stick with it....in the next month I'm going to strip it down. I'll be posting pics as I go...

Kind regards

Shuggie

Title: Re: CB750K7 resto
Post by: Matt_Harrington on August 02, 2023, 10:20:51 AM

As is always said, we love a piccy or 2......

Title: Re: CB750K7 resto
Post by: Johnny4428 on August 02, 2023, 10:31:35 AM

Hi Shuggie, you’ve got a nice couple of bikes there for restoring. Looking forward to seeing pics and updates, always interesting to see what you find when tearing into one of these old machines. Good luck!

Title: Re: CB750K7 resto
Post by: Honda enthusiast on August 02, 2023, 10:36:04 AM

Hey Matt

Here's two pics, the seat cover isn't fitted well either but has a good base no rust. I've just bought the oe exhaust from DS and a pair of shocks too.

Johnny4428 Hi 😉 Yes I love starting a new project, it's going to be nice...I'll start taking off bits tomorrow 👍

Shuggie

[attachimg=1]
[attachimg=2]

Title: Re: CB750K7 resto
Post by: Honda enthusiast on August 20, 2023, 10:08:53 AM

I've started stripping it down, nice thing is I've not found any non original bolts yet but the rear brake pedal shaft is bent, I'll have a go at straightening it in situ but not convinced it will work. I really enjoy stripping a bike down a journey of perusal and discovery hopefully not bad 🤠[attachimg=1]

Title: Re: CB750K7 resto
Post by: Honda enthusiast on August 23, 2023, 04:03:57 PM

I managed to lift the frame off the engine, while it was sitting on it's right side. I'm going to degrease the engine, seal all openings and then soda blast it as a unit. Then a top end rebuild with a new head gasket and rubbers as the head is showing signs of weepage at the front.... After that degrease and paint with Simoniz silver paint in a home made oven booth.[attachimg=1]

Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 27, 2024, 06:16:46 PM

After a long time sorting out my Laverda RGS it's finished and sold...twas a bit time consuming but I'm back now on track with the K7..
Laverda is away on Tuesday, I'll have some space now , woohoo (https://uploads.tapatalk-cdn.com/20240127/e7e953f8a1a2a08f126487c6d00a35f5.jpg)

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Title: Re: CB750K7 resto
Post by: Laverda Dave on January 27, 2024, 06:32:16 PM

You've sold the Laverda  :'(

Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 27, 2024, 06:42:02 PM

I bought it as a 30k km bike and then found out from one of the club member owners that had 130k Kms on it...I was conned but didn't con the buyer now, lost a shed load on it but the buyer is happy.

I've bought an original 1200TS to replace it, this one is all it seems and a keeper(https://uploads.tapatalk-cdn.com/20240127/2c16f727dca1732097a4361e6dc6fdaa.jpg)

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 27, 2024, 06:44:36 PM

Nuff said, I'll post pics of what's been done on the K7 tomorrow

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Title: Re: CB750K7 resto
Post by: Laverda Dave on January 28, 2024, 01:31:10 PM

Quote from: Honda enthusiast on January 27, 2024, 06:42:02 PM

I bought it as a 30k km bike and then found out from one of the club member owners that had 130k Kms on it...I was conned but didn't con the buyer now, lost a shed load on it but the buyer is happy.

I've bought an original 1200TS to replace it, this one is all it seems and a keeper(https://uploads.tapatalk-cdn.com/20240127/2c16f727dca1732097a4361e6dc6fdaa.jpg)

Sent from my moto g(8) using Tapatalk

So you are still in the family 👍

Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 28, 2024, 02:00:03 PM

Yes very much so , the Laverda club are a very helpful and friendly bunch...better luck this time as I've had the engine running well but I will strip it down to restore, it's too nice to run as a rough looking one

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 28, 2024, 02:05:40 PM

As I said, I've been doing a bit and have wire brushed with a six inch wire wheel, all the bike parts which need BZP and I'll be starting soon.. the one hp polisher/grinder/wire brushed is a beast and I'm careful now wearing rigging gloves after a few abrasions!
(https://uploads.tapatalk-cdn.com/20240128/49f0a01a9a40434856ee6ede97a92b1d.jpg)(https://uploads.tapatalk-cdn.com/20240128/4122c136f3248de02cfd2556246fcd83.jpg)

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 28, 2024, 02:08:10 PM

The cracked RHS side panel has been replaced with a pattern one from DSS and John who sold me the bike gave me some paint which I've used(https://uploads.tapatalk-cdn.com/20240128/f9ad88a0ab80770fe8253a8104f9deb7.jpg)

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 28, 2024, 02:10:17 PM

Peter Horton has done the clocks, super nice guy and a super nice job...bike has done a genuine 10k miles verified by the American title(https://uploads.tapatalk-cdn.com/20240128/ee4aa10409261fbf7e9b6d0d4c64740b.jpg)

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 28, 2024, 02:14:14 PM

Was looking for replacement shocks about an inch longer to make it easier to get on the centre stand and came across this Honda 750/900 dohc pair new at £170 of list, couldn't resist as I had a pair on my Kettle and they are head and shoulders above others available (https://uploads.tapatalk-cdn.com/20240128/ca7d038ab18574a41be4aeeb6d922554.jpg)

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 28, 2024, 02:20:10 PM

And after plugging all the ports and breathers, I've soda blasted to engine as a first attempt to clean it...I'll be completing that job with brushes and gunk red degreaser on the bench before painting with vht silver...after blasting I've removed the visible engine bolts to zinc plate them, the lower crankcase halves are secured by the side casings and some bolts from my bolts box to stop them separating and breaking the Honda bond seal...(https://uploads.tapatalk-cdn.com/20240128/ea6ea3035bcd09dfc1874a700ce9cdf5.jpg)

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on January 28, 2024, 02:35:41 PM

It's going to be an easy makeover, the bike ran perfectly before the strip down to paint the engine, so it's getting a powder coated frame and brackets, chrome getting redone in triple plate, engine paint, zinc plating of fasteners, brakes overhaul, Dyna s ignition and fireblade coils and a new David Silver replica four pipe exhaust...the front rim is getting replaced with a nos DID genuine one I've had for years...i hope to have it all done for autumn this year

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Title: Re: CB750K7 resto
Post by: Honda enthusiast on February 05, 2024, 05:13:06 PM

[attachimg=2]

Yesterday finally got my finger out and set up the plating kit and by three in the afternoon today had almost all the zinc plating done...just the engine jis screws and the stand springs and mounting bolts to do...I'm happy 😁 ahead of where I thought I'd be
[attachimg=1]

Title: Re: CB750K7 resto
Post by: Johnny4428 on February 05, 2024, 05:57:05 PM

That’s major plating been going on there Shuggie, very satisfying especially after all the cleaning.

Title: Re: CB750K7 resto
Post by: Honda enthusiast on February 05, 2024, 07:29:09 PM

i'm with that Johnny, I was expecting for it to take weeks so well pleased. Its a learning curve and the first time i've been able to apply methods I've learned doing the Kettle previously. Just time saving methods of stringing the parts together and using a magnet on a stalk to recover parts that inevitably slip off.... :D

Better weather tomorrow to do some fencing till Wednesday and then go through the parts, replate rejects and get the stands fixings and springs off the frame and the cover screws for zincing. Also to have a good look around to check there's none missed, very annoying to find some when the plating kit has been stored.

 I've decided to do my own polishing so the covers are coming off to strip old lacquer off and polish and half decided but unsure whether to strip the engine to do the engine paint bake on with bare cases....its only got just under ten k on the clock so it might do more harm than good... ???

Title: Re: CB750K7 resto
Post by: Spitfire on February 06, 2024, 03:39:37 PM

That plating is ever so impressive.

Title: Re: CB750K7 resto
Post by: McCabe-Thiele (Ted) on February 06, 2024, 08:05:53 PM

I agree it's as good as if not better than  my local platers.👍👍👍

Title: Re: CB750K7 resto
Post by: Honda enthusiast on February 06, 2024, 08:31:47 PM

Thanks both of you 😁 Spitfire and Ted

I've been sending zinc plating to Derby plating for years but the last job for my Honda Bros was £150 all in so with that and the nagging worry if Royal Mail lost the parcel made me do it myself...Ian ( Orcadian) gave me some encouragement and I haven't looked back.
I've had better results this time by careful washing off between acid, alkali cleaners and the plating baths.The surface prep with the wire wheel and gunk degreaser has also helped as well as the clear blue passivate being warm in a plastic bucket...I think it was reacting with the stainless container used previously 🤔👍

Title: Re: CB750K7 resto
Post by: Jan B on February 06, 2024, 08:58:55 PM

Quite impressive plating you've got going there!
I think i have to give it a go myself because my local plater doesn't take new orders soon. Too busy.

Title: Re: CB750K7 resto
Post by: Honda enthusiast on February 06, 2024, 09:22:57 PM

Quote from: Jan B on February 06, 2024, 08:58:55 PM

Quite impressive plating you've got going there!
I think i have to give it a go myself because my local plater doesn't take new orders soon. Too busy.

Look at the Gateros plating website, and Dan one of the owners is very helpful...with anything like this results improve as you work at it... pm me if you need any input

Title: Re: CB750K7 resto
Post by: Honda enthusiast on February 29, 2024, 09:48:34 PM

I've stripped the engine now and it's over to cleaning prior to paint...the insides are in good condition with only the primary tensioner and cam chain rollers need replacing....I have a good HD camchain from Nurse Julie and a genuine primary chain set... from memory it's a bit different in detail to the K4 but fortunately I got a genuine manual for it from Honda classics[attachimg=1]

Title: Re: CB750K7 resto
Post by: AshimotoK0 on March 01, 2024, 12:07:46 AM

I recently  asked one of our resident gurus on here about CB750 primary chains and he advised me to stagger them... like this:-

[attachimg=1]

Title: Re: CB750K7 resto
Post by: Honda enthusiast on March 01, 2024, 08:45:27 AM

Cheers Ash I'm not with you on your recommendation, aren't the teeth on the two sprockets machined in pairs , so how could the chain be staggered?

Title: Re: CB750K7 resto
Post by: McCabe-Thiele (Ted) on March 01, 2024, 09:11:16 AM

I'm assuming it's the chains rivet orientation.

Title: Re: CB750K7 resto
Post by: Honda enthusiast on March 01, 2024, 09:19:46 AM

Thanks Ted, you're more observant than me , I can see that now 😎👍👍

Title: Re: CB750K7 resto
Post by: AshimotoK0 on March 01, 2024, 11:22:48 AM

Quote from: Honda enthusiast on March 01, 2024, 09:19:46 AM

Thanks Ted, you're more observant than me , I can see that now 😎👍👍

Sorry should have clarified better  :-[ . Ted is correct.

Title: Re: CB750K7 resto
Post by: Honda enthusiast on March 01, 2024, 11:29:45 AM

Thanks for the tip, Ash 😁

Title: Re: CB750K7 resto
Post by: McCabe-Thiele (Ted) on March 01, 2024, 11:58:33 AM

Quote from: Honda enthusiast on March 01, 2024, 09:19:46 AM

Thanks Ted, you're more observant than me , I can see that now 😎👍👍

I'm a wee beginner at observation HE- I'm trying to gravitate towards an apprentice version of a Grand Master Oddjob. ;D ;D ;D