Author Topic: CB750K8 Project  (Read 48599 times)

Offline martin_uk

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CB750K8 Project
« on: December 05, 2014, 05:56:51 PM »
Added a new CB750 to my collection  :)

A US import 1978 K8.

Picked up today.

Engine was out, as PO found seized, various bits missing.

Not tried an import before, have NOVA paperwork.

I can hear Davis Silver rubbing his hands :P

CB750K8 purchased eb by nitram2010, on Flickr

CB750K8 purchased eb $_57 by nitram2010, on Flickr

CB750K8 purchased eb 1$_57 by nitram2010, on Flickr

007 by nitram2010, on Flickr

003 by nitram2010, on Flickr

1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline Bitsa (Ralph Wright - RIP)

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Re: CB750K8 Project
« Reply #1 on: December 05, 2014, 06:52:02 PM »
Martin
Forget the other post you have them here.Got some clocks maybe but you can rebuild the ones you have.First impressions not bad seats no big deal whats wrong with the motor?
What bits are missing?
Cheers
Bitsa
Long Live Best Bitter.Status Quo and Sohc Bikes and common sense which you can not teach

Offline martin_uk

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Re: CB750K8 Project
« Reply #2 on: December 05, 2014, 07:33:52 PM »
Martin
Forget the other post you have them here.Got some clocks maybe but you can rebuild the ones you have.First impressions not bad seats no big deal whats wrong with the motor?
What bits are missing?
Cheers
Bitsa

Choke cable bracket
Side panels
Front brake master cylinder
Ignition switch and key orig if poss
Tail lamp lens
Headlight brackets with good chrome
Rear grab rail
Instruments
Headlight complete (UK dip) assume same as K7?
Carbs Keihin PD42B
Exhausts
Seat cover
Alternator cover
New cables
Oversize pistons/rings

Any other good K8 bits
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

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Re: CB750K8 Project
« Reply #3 on: December 05, 2014, 07:39:43 PM »
Havnt fully decided the standard I am looking to achieve, as I know these are not so much in demand and I dont like spending more than they are worth, but usually do  :-[

Will certainly get frame and black painted parts powder coated and zinc plate all the sound fittings.
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline Bitsa (Ralph Wright - RIP)

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Re: CB750K8 Project
« Reply #4 on: December 05, 2014, 08:14:43 PM »
Martin
I have a alternator cover not 100 percent but would say 98 though.If the throttle cables are the same for low bars uk have them too one new one used but good chrome.I also have a k7 master cylinder works fine but needs new seals.Instruments have various if you want photos can do tommorrow.Have a complete rear light but lens cracked good condition
Cheers
Bitsa
Long Live Best Bitter.Status Quo and Sohc Bikes and common sense which you can not teach

Offline martin_uk

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Re: CB750K8 Project
« Reply #5 on: December 05, 2014, 08:17:49 PM »
Martin
I have a alternator cover not 100 percent but would say 98 though.If the throttle cables are the same for low bars uk have them too one new one used but good chrome.I also have a k7 master cylinder works fine but needs new seals.Instruments have various if you want photos can do tommorrow.Have a complete rear light but lens cracked good condition
Cheers
Bitsa

Thanks Bitsa
Does the K7 master cyl have provision for stop light switch?

1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline Bitsa (Ralph Wright - RIP)

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Re: CB750K8 Project
« Reply #6 on: December 05, 2014, 08:21:18 PM »
Martin
No the stop switch is located on the splitter on the lower fork yoke.I have seen this type on the USA eBay site though.
Cheers
Bitsa
Long Live Best Bitter.Status Quo and Sohc Bikes and common sense which you can not teach

Offline martin_uk

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Re: CB750K8 Project
« Reply #7 on: December 06, 2014, 02:20:31 PM »
It is out of van and took a closer look.

Some good and bad news  ???

The engine still has its original oil pipe fixing screws (missing from all my other bikes)

2014_1206Kparts0031 by nitram2010, on Flickr

2014_1206Kparts0020 by nitram2010, on Flickr

Lots of parts better than expected and rear mudguard chrome is quite good.

Generally seems quite original, but quite a few bits missing.

Thought it was a Black tank, but is in fact a very dark maroon metallic.

2014_1206Kparts0034 by nitram2010, on Flickr

2014_1206Kparts0037 by nitram2010, on Flickr

Wiring and HB switches very poor, looks like UV damage, the plastic connector housings are crumbling!

2014_1206Kparts0039 by nitram2010, on Flickr

2014_1206Kparts0043 by nitram2010, on Flickr


1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline Bitsa (Ralph Wright - RIP)

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Re: CB750K8 Project
« Reply #8 on: December 06, 2014, 07:22:22 PM »
That is a good base of a restore.You will have a little problem of finding some parts but on the whole done worse than you have.
Cheers
Bitsa
Long Live Best Bitter.Status Quo and Sohc Bikes and common sense which you can not teach

Offline Trigger

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Re: CB750K8 Project
« Reply #9 on: December 06, 2014, 07:29:57 PM »
That is a USA or Canadian  import, never available in the UK. Parts are hard to find for the K8 in the UK. Must of got that one cheep. What is the engine Number?

Offline martin_uk

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Re: CB750K8 Project
« Reply #10 on: December 06, 2014, 07:40:40 PM »
That is a USA or Canadian  import, never available in the UK. Parts are hard to find for the K8 in the UK. Must of got that one cheep. What is the engine Number?

Its CB750E 30530xxx x =hidden number

Lots of parts seem same,  405 middle part number number for this model
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

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Re: CB750K8 Project
« Reply #11 on: December 06, 2014, 07:55:42 PM »
Started the strip, hoping to have frame etc ready for powder coaters Monday, so can be done before they close for Xmas  :-\

May not work out if too many seized parts, but good to have a goal and something to keep me busy over break!

Just received some parts from cruzinimage (Ebay) from Japan.

Have used before and reasonable for pattern parts.

2014_1206Kparts20112 by nitram2010, on Flickr

2014_1206Kparts20113 by nitram2010, on Flickr

2014_1206Kparts20115 by nitram2010, on Flickr

2014_1206Kparts20114 by nitram2010, on Flickr

2014_1206Kparts20116 by nitram2010, on Flickr

Just need to find carbs to go with rebuild kit  :-[

1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline Trigger

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Re: CB750K8 Project
« Reply #12 on: December 06, 2014, 07:57:31 PM »
Hi number. Could you put a picture up of a piston from that engine? I want to see if it the same as the F2 ones. The F1 used two types of piston, some are from the early K and the latter ones have a dot instead of the arrow on the crown.

Offline martin_uk

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Re: CB750K8 Project
« Reply #13 on: December 06, 2014, 08:02:17 PM »
Some more wiring pics

2014_1206Kparts20111 by nitram2010, on Flickr

2014_1206Kparts20108 by nitram2010, on Flickr

2014_1206Kparts20077 by nitram2010, on Flickr

Assume switches started off Black
2014_1206Kparts20074 by nitram2010, on Flickr

Missing fork cap

2014_1206Kparts20079 by nitram2010, on Flickr

Original colour

2014_1206Kparts20094 by nitram2010, on Flickr
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

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  • Posts: 435
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Re: CB750K8 Project
« Reply #14 on: December 06, 2014, 08:05:17 PM »
Hi number. Could you put a picture up of a piston from that engine? I want to see if it the same as the F2 ones. The F1 used two types of piston, some are from the early K and the latter ones have a dot instead of the arrow on the crown.

Parts list shows piston as 131013 392 020  so assume its the F1 type.

Does have a dot on piston, will take some pics
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

 

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