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 CB750K4 restoration

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Rob62
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PostSubject: CB750K4 restoration   Sun Dec 31 2017, 18:28

Well, I finally started working on the 750 today.. xmas out of the way and decorating finished so no more excuses. Didn’t do a great deal, tank and seat off. Tank is in great condition just a few scratches here n there so will stay as it is. Seat is a brand new replica and tbh looks great, just missing the honda logo but i can stencil that on later if i feel the need. I want to change the usa bars for some lower uk style ones so off with those. Took me half an hour to get the wires out of the bars as the sheath had hardened, will replace it with heat shrink. Stripped off the headlight and seperated the various wiring bundles. I’ll draw up a diagram later to make it easy for myself at rebuild time. One or two wiring mods in there, not too bad though. Everything came apart easily and looks to be in great condition. I lifted the rubbers off the carb tops for a look, one of the rubbers is split but the other three are ok, there is still yellow paint on top of the carb slider adjusters...!. Noticed another wasps nest between the rear frame and the plastic mudguard. Brought some parts inside for a clean up but thats all they will need i reckon, switches and master cylinder...  Hopefully will be a painless recommission...


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andysej



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PostSubject: Re: CB750K4 restoration   Wed Jan 03 2018, 20:57

Looks in good nick. Should be on it by summer.
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Rob62
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PostSubject: Re: CB750K4 restoration   Fri Jan 05 2018, 21:31

Hopefully Very Happy
Done a bit of cleaning in the week, headlamp is the original sealed beam, still works so cleaned it up, virtually zero rust on the rim, probably half a candle power but is original so will stay for the time being.


The switch gear cleaned up easiily, just needs re sleeving where the old stuff disintegrated.


The master cylinder needs a new diaphragm as the old one has hardened and shattered, the cap is like new, but worst of all the circlip is stubbornly rusted in despite a soaking with penetrating oil. Will have another go at it this weekend as I like the patina and really want to keep it on the bike.

The mirrors are good except for some heavy pitting on the stems, but they look original so I will keep them for the time being.
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Rob62
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PostSubject: Re: CB750K4 restoration   Sun Jan 07 2018, 21:41

Managed to get the master cylinder circlip out finally... hopefully i can now salvage it with a rebuild kit instead of having to buy a new pattern part

Got most of the bike stripped, now its a rolling chassis with the motor still in, its a f*k big lump but will be coming out soon. Needs a check over and re-painting. 

Carbs look in great condition, they will get a strip and check over but im expecting them to be ok. The carb to cylinder  head rubbers look great, no perishing, but they are almost sold so will need replacing.


Some of the electrical components need a good clean and check, of all the parts i removed they were in the worst shape appearance wise. The harness looks good, may do a bit of re-sleeving but it looks ok as it is tbh.


.
Plenty to keep me busy for a few days...
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Rob62
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PostSubject: Re: CB750K4 restoration   Mon Jan 08 2018, 21:38

Tonight it was time to have a look at the clocks...they are in decent condition but need a clean and some refinishing. The black bezels need repainting and the chrome bases need rechrome. The only part of the bike thst needs a rechrome.... so off with the crimp rings
 
After a clean of the face you can really see the difference

The lenses cleaned up nicely too

Once the other parts are refinished i can put them back together, but for now you can see the improvement just by cleaning with a microfibre cloth and some vanish stain remover bar.... The faces are faded but look good to me.
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andysej



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PostSubject: Re: CB750K4 restoration   Wed Jan 10 2018, 20:43

Looking good!!
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Wolfie
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PostSubject: Re: CB750K4 restoration   Wed Jan 10 2018, 21:08

Yeah, looking wayy too good... you're making me itchy to get in that garage.. and it's too feckin cold.

I bet you don't lift that engine out on your own..
Very Happy



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Rob62
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PostSubject: Re: CB750K4 restoration   Thu Jan 11 2018, 19:19

I read that the best way to part the engine from the frame is to lay it over and unbolt then lift the frame off the engine...... I’ll be trying that option first
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andysej



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PostSubject: Re: CB750K4 restoration   Thu Jan 11 2018, 20:01

Sounds like a good option, plenty of wooden packers.
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Wolfie
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PostSubject: Re: CB750K4 restoration   Fri Jan 12 2018, 10:14

Then you've got to get the fecker off the floor.... that 550 I started some years back was the same but slightly smaller.. I nearly strained me worm just moving it around the bench.
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Rob62
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PostSubject: Re: CB750K4 restoration   Fri Jan 12 2018, 21:06

Stripped and cleaned the rear mudguard and light assembly tonight. No rechroming required although it does have some marking and slight pitting. It matches the rest of the bike.... 



Received a few goodies through the post today too 

May remove the engine tomorrow... see how much time i get...
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Rob62
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PostSubject: Re: CB750K4 restoration   Fri Jan 12 2018, 21:08

Wolfie wrote:
Then you've got to get the fecker off the floor.... that 550 I started some years back was the same but slightly smaller.. I nearly strained me worm just moving it around the bench.
Lol...”strained me worm”... it’ll be up on that bench in a flash I’ll just flex me biceps
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Rob62
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PostSubject: Re: CB750K4 restoration   Sat Jan 13 2018, 18:27

Well, towed my bollocks off today trying to extract that engine.... I thought I would try the suggested method of laying the frame on its side and lifting it off the motor.... Well i had to call the cavalry, dragged our andy away from the darts, sorry, thanks for the help though, in the end and after an hour of straining and cursing we finally managed to lift the bugger free, what a pain, will have to come up with a better technique when its time to refit.


Errrr... maybe I will leave it on the floor for a while till i build up strength Very Happy Very Happy

Will do a bit of final stripping the stand off etc tomorrow, and the swing arm pivot appears to be well stuck...
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andysej



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PostSubject: Re: CB750K4 restoration   Mon Jan 15 2018, 19:34

Not "pulled fur off" like that for a while Very Happy
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Rob62
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PostSubject: Re: CB750K4 restoration   Sun Apr 22 2018, 17:03

Been slow through feb and march due to cold shite weather but started to make a bit more progress now its warmed up a bit. Got a few awkward bits powder coated (would have taken a month to clean prep and paint them)

Gave the engine a good degrease and she’s currently ready for paint. Whipped the rocker off for a look inside, amazingly clean for a 44 year old.....

Cleaned up and refinished the rocker


Rubbed down, primed and re-painted the frame






Hopefully get the motor painted next week then start re-assembly
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Artie

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PostSubject: Re: CB750K4 restoration   Sun Apr 22 2018, 19:19

Top job Rob as usual going to be another really nice bike in your collection Thumbs up
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Rob62
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PostSubject: Re: CB750K4 restoration   Sun Apr 22 2018, 19:42

Thanks Martin, it’ll be a rider though not a show winner.... most of the bits are just getting a cleanup, try to keep it original where possible
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andysej



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PostSubject: Re: CB750K4 restoration   Tue Apr 24 2018, 16:31

Looks very nice, hurry up and get on with it now!! Rolling Eyes
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Wolfie
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PostSubject: Re: CB750K4 restoration   Tue Apr 24 2018, 20:30

Rob62 wrote:
Well, towed my bollocks off today trying to extract that engine.... I thought I would try the suggested method of laying the frame on its side and lifting it off the motor.... Well i had to call the cavalry, dragged our andy away from the darts, sorry, thanks for the help though, in the end and after an hour of straining and cursing we finally managed to lift the bugger free, what a pain, will have to come up with a better technique when its time to refit.


Errrr... maybe I will leave it on the floor for a while till i build up strength Very Happy Very Happy


Hehehe... I tried to warn you about those Honda lumps.. I can lug the H2 engine out with a bit of effort, the S1 I can chuck over me shoulder, but that 550 thing had to stay on the floor until someone else came along.
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Rob62
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PostSubject: Re: CB750K4 restoration   Wed May 09 2018, 20:33

A bit more progress recently. Got some paint on the motor. Needs all the covers fitting with new gaskets etc then can be fitted to the frame.


Took some chroming to Sean at Agbrigg, 2 weeks he quoted me and i was more than happy with that...however less than a week later and its all done. Excellent service as usual!

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Rob62
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PostSubject: Re: CB750K4 restoration   Tue May 15 2018, 21:57

Starting to move in the right direction...... Very Happy
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Rob62
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PostSubject: Re: CB750K4 restoration   Thu May 17 2018, 22:28

A bit more progress and a few more shiny parts..... hopefully apart froma pair of new tyres, thats the end of the spending Smile



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andysej



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PostSubject: Re: CB750K4 restoration   Tue May 22 2018, 22:05

Looking nice Thumbs up
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Rob62
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PostSubject: Re: CB750K4 restoration   Sat May 26 2018, 20:53

A bit more progress...takes a lot longer to put together than it took to take apart.... Shocked






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Rob62
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PostSubject: Re: CB750K4 restoration   Sun Jul 01 2018, 23:19

Been a while since i updated this.... been keeping busy on the bike although I’ve been on holiday too. Managed to get the majority of the electrics working before i went off for me hols

A glimmer of life

Made more progress since i returned... now its on 2 wheels


But best of..... its alive
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