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1970 CB350K3 Mild 'Restoration' [message #300553] Wed, 10 April 2019 13:55 Go to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
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(1) Club Racer
Hi All,

New to the forum. I actually have a question about another bike, but I thought it would be nice to start a thread about my on-going CB350K 'restoration' I'm doing at the moment.

I bought the bike off eBay around August last year. It's a US import and hasn't been on the road since 2006. It looked pretty good from a distance, but up close it needed work and had a few bits broken / missing.

From the auction
https://i.imgur.com/wRacseS.jpg

https://i.imgur.com/RN7C1Cy.jpg

Link to the auction photos album: https://imgur.com/gallery/t16aHbE

Arrival day:
https://i.imgur.com/XK9bhf9.jpg

Closer look at the damage / missing parts:
https://i.imgur.com/HAWVj5p.jpg

https://i.imgur.com/MTgDPwe.jpg

https://i.imgur.com/Z9vhLoi.jpg

Re: 1970 CB350K3 Mild 'Restoration' [message #300554 is a reply to message #300553] Wed, 10 April 2019 14:01 Go to previous messageGo to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
Karma: 0
(1) Club Racer
Update 01 (from May 2018)

A closer look at the bike.

Damaged float bowl on one of the carbs.
https://i.imgur.com/Acgopwv.jpg

The points look pretty good, other than chewed up fasteners. I'll probably leave this for the moment.
https://i.imgur.com/SOmzuuv.jpg

HT leads are shot and the plug caps are missing.
https://i.imgur.com/tT4gjT7.jpg

Plugs look good though.
https://i.imgur.com/JjSeLb5.jpg

New battery fitted.
https://i.imgur.com/h2zTUpD.jpg

Full album: https://imgur.com/gallery/uVQuOLo
Re: 1970 CB350K3 Mild 'Restoration' [message #300555 is a reply to message #300554] Wed, 10 April 2019 14:18 Go to previous messageGo to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
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(1) Club Racer
Update 02 (from May 2018)

Mostly looking at the electrics in this update. I was going to replace the ignition switch, as I only had one key. Then I remembered that security was crap in the 1970s and found the code on the lock that I could use to order a new spare key. (I will be adding a tracker to this bike in the future).

This HT lead has a join(!) in it, and no rubber cap.
https://i.imgur.com/LSKEcPv.jpg

The other coil also had a broken lead, but no extension.
https://i.imgur.com/sCqGdbZ.jpg

I also had a quick look at the flasher relay as it's right next to the coils and didn't work. No obvious sign of damage.
https://i.imgur.com/3zuQlOn.jpg

I remove the coils, they still work, but I have no appetite for using bodged HT leads. If I had the time, I would cut the plastic back and solder on new HT leads (may still do this to keep them as spares).
https://i.imgur.com/QdirQ2m.jpg

Coils removed from bracket (was a pain in the arse, bolts seized and rounded off).
https://i.imgur.com/QX7w7g1.jpg

I had ordered new (repro) coils from David Silver.
https://i.imgur.com/OOdeJz5.jpg

Both new coils fitted.
https://i.imgur.com/kDv1MdE.jpg

New coils and bracket back on the bike.
https://i.imgur.com/d8SJc1I.jpg

Next I have a look at the air filters.
https://i.imgur.com/zGKtuna.jpg
Which are both shot.

The butterfly in this carb is damaged too.
https://i.imgur.com/MtovNGM.jpg

I do however get the bike to run very briefly by squirting 2 stroke mix down the carbs. So I know the engine's a runner and I installed the coils correctly. smile

Link to the full album: https://imgur.com/gallery/yVfAb8T
Re: 1970 CB350K3 Mild 'Restoration' [message #300556 is a reply to message #300555] Wed, 10 April 2019 14:24 Go to previous messageGo to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
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(1) Club Racer
Update 03 (from May 2018)

I turn my attention to the fuel tank. An easy job I was hoping, and how wrong I was...

It looks good on the outside to begin with.
https://i.imgur.com/2uGCAQ5.jpg

Petcock - that's not good.
https://i.imgur.com/DLPqlrr.jpg

A seam it weeping too. Sad
https://i.imgur.com/J1VXsqK.jpg

The tank hardware is almost all shot. I look at getting the cap plated, but it's pretty pricey.
https://i.imgur.com/TRAhqut.jpg
Re: 1970 CB350K3 Mild 'Restoration' [message #300558 is a reply to message #300556] Wed, 10 April 2019 14:32 Go to previous messageGo to next message
spagiratwink is currently offline  spagiratwink   United Kingdom
Messages: 528
Registered: January 2016
Karma: 4
(6) Moto1 GP Racer
Hi matey I'm sure Kermit will be along and place your post's in the relevant place , just keep posting smile
Re: 1970 CB350K3 Mild 'Restoration' [message #300559 is a reply to message #300556] Wed, 10 April 2019 14:34 Go to previous messageGo to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
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Update 04 (from June 2018)

I've done some brazing before, not much, but enough that I'm willing to give it a go. However, my original plan was to have the bike MoTd in 2018 (ha!) so I bought a known good tank off eBay.
https://i.imgur.com/ULKxmnq.png

Whilst I'm waiting for the 'new' tank to arrive, I turn my attention to the brakes.

Rear brake rod.
https://i.imgur.com/Ob1Ozi2.jpg
Pretty sure there should be a butterfly nut on there so I can adjust it without tools.

Whilst I'm there, I notice a bolt missing from the took peg bracket too.
https://i.imgur.com/Em6Wafk.jpg
(Sorry for the potato vision)

I go to take the rear wheel off to have a good look at the brakes. Going to need a new chain and sprockets.
https://i.imgur.com/133MWic.jpg

Some new rubber wouldn't go a miss too.
https://i.imgur.com/LkuPG7n.jpg

Not too bad, just lots of brake dust.
https://i.imgur.com/2F9oyYP.jpg

Little bit crusty.
https://i.imgur.com/sQJLiAm.jpg

A quick clean up with the brass wire brush.
https://i.imgur.com/eFBIP7u.jpg

This is the brake cam. It should be greased.
https://i.imgur.com/opEEKDw.jpg

Cleaned up ready to reassemble.
https://i.imgur.com/Qjkpwbs.jpg

Upon reassembly prep, I notice that the bolt where the brake reaction arm attaches is supposed to have it's nut secured via a split pin. The dirt had hidden this feature when I took it off.
https://i.imgur.com/EUyDhkz.jpg

On closer inspection, there was a broken split pin jammed in there.
https://i.imgur.com/WvSqvfR.jpg

Wheel back together for the moment.
https://i.imgur.com/Jj2jQhM.jpg

Back on the bike.
https://i.imgur.com/G5GGmE7.jpg
Re: 1970 CB350K3 Mild 'Restoration' [message #300560 is a reply to message #300559] Wed, 10 April 2019 15:00 Go to previous messageGo to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
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(1) Club Racer
Update 05 (from June 2018)

Front brake next (also a drum).
https://i.imgur.com/CX5iDiz.jpg

All looks good. The speedo drive was still nicely greased.
https://i.imgur.com/grVCMgn.jpg

I remove the brake cam anyway and clean it and regrease, then reassemble the brake and put the wheel back on the bike.
https://i.imgur.com/ZXOlA7v.jpg
Re: 1970 CB350K3 Mild 'Restoration' [message #300561 is a reply to message #300558] Wed, 10 April 2019 16:41 Go to previous messageGo to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
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spagiratwink wrote on Wed, 10 April 2019 14:32
Hi matey I'm sure Kermit will be along and place your post's in the relevant place , just keep posting smile
Doh! I thought this was the right place for restoration and rebuild?

Ok. smile
Re: 1970 CB350K3 Mild 'Restoration' [message #300562 is a reply to message #300561] Wed, 10 April 2019 16:48 Go to previous messageGo to next message
Julian is currently offline  Julian   United Kingdom
Messages: 11
Registered: April 2019
Karma: 0
(1) Club Racer
Update 06 (from June 2018)

More electrics and some new parts.

The old indicator bulbs were shot and this lens was on upside down.
https://i.imgur.com/K6eE3y9.jpg

Getting the screws out were a PITA, but I managed to extract them and replace with stainless.
https://i.imgur.com/aY9i52S.jpg

They have hex (allen) heads, so less likely to round the heads off, and fir the lenses perfectly.
https://i.imgur.com/ZSSglxG.jpg

Fitted a replica battery cover from David Silver.
https://i.imgur.com/SNZHniP.jpg

Got some split pins small enough for the rear brake reaction arm.
https://i.imgur.com/OQIu3KS.jpg

And got the right hand adjustment nut for the rear brake (from CMSNL, new old stock).
https://i.imgur.com/MNaaEgP.jpg

I cleaned up the thread on the brake rod before fitting.
https://i.imgur.com/I3Fb7bP.jpg

How it should be.
https://i.imgur.com/KBPOeXF.jpg
Re: 1970 CB350K3 Mild 'Restoration' [message #300567 is a reply to message #300562] Thu, 11 April 2019 18:31 Go to previous messageGo to next message
Kermit is currently offline  Kermit   United Kingdom
Messages: 23506
Registered: June 2003
Location: Yorkshire
Karma: 34
(22) Giacomo Agostini
Hi Julian, nice project you've got yourself there, lots to do but plenty of potential too. Hope to get more updates soon as I see from the dates mostly from summer last year so expect it might be ready by now and getting ridden? Grin

Out of interest as I'm half looking for a new project myself, what sort of money was it?

You might want to resize images to <1000 pixels wide as most of us unformtunatly (me included) don't have 3264 pixel wide monitors. There's an option in IMGUR albums to AUTO RESIZE and most of us would find them easier to view if they were about a 1024x768 sort of size from those options

[Updated on: Thu, 11 April 2019 18:41]

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Re: 1970 CB350K3 Mild 'Restoration' [message #300572 is a reply to message #300567] Sat, 13 April 2019 08:47 Go to previous message
Gearbox is currently offline  Gearbox   United Kingdom
Messages: 5641
Registered: January 2004
Location: Beds (UK)
Karma: 19
(15) Kenny Roberts
labour of love, been there and still doing it. Mr Silver will be collecting your money by the bucketful.
Enjoy the challenge,
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