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 CB750K4 restoration

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Rob62
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Rob62

Posts : 320
Join date : 2017-10-17
Age : 56

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PostSubject: CB750K4 restoration   CB750K4 restoration EmptySun 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...
CB750K4 restoration E0939_E41-9_A00-45_AE-8_E85-_AE787423_B60_F
CB750K4 restoration 86085127-1_E4_C-4167-8_DCC-0_C2_E1_CC2981_F
CB750K4 restoration 34_F0675_A-_B677-4_EBC-_AF36-_FC55_DC872_CBE
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andysej



Posts : 68
Join date : 2017-10-19

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

Looks in good nick. Should be on it by summer.
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Rob62
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Rob62

Posts : 320
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Age : 56

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyFri 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.
CB750K4 restoration 4_C1_DD242-62_B3-4_F8_F-9973-86_D77274_E0_F7
CB750K4 restoration EEB7_A610-17_A6-4198-_BD4_E-_F22_C86_B162_C8
The switch gear cleaned up easiily, just needs re sleeving where the old stuff disintegrated.
CB750K4 restoration DAE3_ED0_E-90_F8-4_C96-8_FAB-6736909739_C9
CB750K4 restoration D0_E7997_F-0400-4_C9_E-_B735-61_A71263908_D
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.
CB750K4 restoration 7_AA5_DD31-_CF71-42_EB-881_F-_A93_DA8_BBC35_D
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.
CB750K4 restoration E52_A6432-_A726-48_AF-8919-7_E1103_ECCD1_E
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Rob62
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Rob62

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Age : 56

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptySun 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
CB750K4 restoration 9_FA6_E5_BD-_D741-4_F4_D-_AC27-_D19_A74019_A3_A
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. 
CB750K4 restoration 2352713_A-590_D-4_FED-_A9_AD-_B8_C295_A78_EB7
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.
CB750K4 restoration 760_F399_F-56_C4-4_CB7-_B0_A4-_F9259_D2314_FC
CB750K4 restoration 7_E436_DF0-5_E66-4_A99-92_F4-04863_A53352_B
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.
CB750K4 restoration AE5_FCE26-_CDF0-46_EF-_BF33-_BB2_B579_F7389
CB750K4 restoration 1_CDE7_FD3-0980-4465-899_D-2_D27_B1_B48_B25
CB750K4 restoration 56_C44_F5_C-_DFA2-4389-9358-_A172263_DCA9_D.
Plenty to keep me busy for a few days...
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Rob62
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Rob62

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Age : 56

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyMon 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
CB750K4 restoration B7_FAF0_F6-_ADF0-43_E4-8_E6_E-8963_A034_B4_F2 
After a clean of the face you can really see the difference
CB750K4 restoration 7_E71_DBF6-_BF6_C-4221-_B33_E-4_A06_A2_A52858
The lenses cleaned up nicely too
CB750K4 restoration 96306556-5_FB0-4374-8_FC4-_FA82_FCEFB23_D
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.
CB750K4 restoration CE4_C42_C2-_D381-49_E6-8_C83-_EA4258_AA2_AE1
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andysej



Posts : 68
Join date : 2017-10-19

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

Looking good!!
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Wolfie
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Wolfie

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyWed 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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Rob62

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Age : 56

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyThu 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



Posts : 68
Join date : 2017-10-19

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

Sounds like a good option, plenty of wooden packers.
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Wolfie
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Wolfie

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Age : 112

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyFri 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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Rob62

Posts : 320
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Age : 56

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyFri 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.... 
CB750K4 restoration 325_CE910-9_F07-4_FEA-8546-7687_CF45_FCF9
CB750K4 restoration 43_A30445-5_BCA-4_DF3-8_A2_D-7_BA9_CF25_CF75
CB750K4 restoration B5_F76_D2_D-_A087-469_E-837_C-_D6807781_FE6_A
Received a few goodies through the post today too 
CB750K4 restoration 5E40E4C1-C2A8-4C43-B4BE-199819220FCB
May remove the engine tomorrow... see how much time i get...
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Rob62
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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyFri 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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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptySat 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.
CB750K4 restoration E5AB5548-74E1-4793-B43F-0805209AFEC7
CB750K4 restoration B6D2C668-75AA-4A4C-BC5B-0A87F16D08F9
Errrr... maybe I will leave it on the floor for a while till i build up strength Very Happy Very Happy
CB750K4 restoration 94627202-D2CB-4809-8825-59EDEC396609
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



Posts : 68
Join date : 2017-10-19

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyMon 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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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptySun 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)
CB750K4 restoration 92C18650-0C61-4ED8-887B-E7D7E6C1DE40
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.....
CB750K4 restoration F97C1245-0823-46D0-8003-FABEE84560DB
Cleaned up and refinished the rocker
CB750K4 restoration 25_DB6_ED1-6746-44_E2-_A256-_ED286301_CC4_A
CB750K4 restoration 62_A12792-_A99_F-4435-_BF99-_E3_AAA5944_E08
Rubbed down, primed and re-painted the frame
CB750K4 restoration 61FFBAB2-BA18-4181-9A12-020EBD7789DE
CB750K4 restoration DB590_E29-99_B3-40_F8-_AEC0-3_D5861550048
CB750K4 restoration 08_B0_B36_E-9_AFE-4_F46-80_A0-_A780_FF0617_F2
CB750K4 restoration 13_E647_B2-4224-4823-_AAE3-13_ACDDA6_BA86
CB750K4 restoration 904366ED-00B7-4BE6-8DF2-3EB52C8FFE11
CB750K4 restoration A77_AD4_F4-9655-41_D4-8_F4_E-_A6426_B44_E217
Hopefully get the motor painted next week then start re-assembly
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Artie

Artie

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptySun 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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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptySun 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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Join date : 2017-10-19

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyTue 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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Wolfie

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyTue 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.
CB750K4 restoration E5AB5548-74E1-4793-B43F-0805209AFEC7
CB750K4 restoration B6D2C668-75AA-4A4C-BC5B-0A87F16D08F9
Errrr... maybe I will leave it on the floor for a while till i build up strength Very Happy Very Happy
CB750K4 restoration 94627202-D2CB-4809-8825-59EDEC396609

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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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyWed 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.
CB750K4 restoration 156EA06B-C2EC-46C0-AD77-130B2B232B7F
CB750K4 restoration D0_FC561_E-5_A0_D-4_C5_C-9_E4_B-1526_B109989_B
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!
CB750K4 restoration B2DA44A4-192B-438C-A10E-31272BAFE7FA
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Rob62
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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyTue May 15 2018, 21:57

Starting to move in the right direction...... Very Happy
CB750K4 restoration B6E584DC-322E-47BD-9D2C-51A29765190E
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Rob62
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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptyThu 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
CB750K4 restoration A50FE89F-894C-431A-98F5-1A79FECB1886
CB750K4 restoration 89DDAB6D-6E0C-49B0-BE18-89EE0D2BA67C
CB750K4 restoration 39188777-209B-440D-919C-16194BF283C0
CB750K4 restoration EB3CDD88-C639-430A-8417-3EE92717099E
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andysej



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

Looking nice Thumbs up
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Rob62
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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptySat May 26 2018, 20:53

A bit more progress...takes a lot longer to put together than it took to take apart.... Shocked
CB750K4 restoration 4_B974178-_A737-4_FCB-97_D8-430_C0447558_D

CB750K4 restoration 7618_DE3_F-56_B0-4765-_A92_D-_FAA1125_DA28_C

CB750K4 restoration 89_B4_BBFB-79_E7-4100-98_F2-4_EA75034_F883

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Rob62
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Rob62

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PostSubject: Re: CB750K4 restoration   CB750K4 restoration EmptySun 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
CB750K4 restoration 2B732262-B15F-45AA-8562-A0704E654D23
A glimmer of life
CB750K4 restoration 8F4B5DBB-8A08-4131-9FD3-AAA83E20D730
Made more progress since i returned... now its on 2 wheels
CB750K4 restoration 8D301086-BEC3-494E-977F-3319AB74DF5A
CB750K4 restoration 47EC65D8-9BC0-46F5-8E24-7373B28E1DEE
But best of..... its alive
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