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Messages - Lobo

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CB350/400 / Re: cb400f - carb sync
« on: February 15, 2019, 12:00:19 PM »
... an aside, I phaffed & farted so much balancing my ‘750 carbs (hot summer’s day) and had a coil fail on the next ride out. Coincidence maybe, but looking back the engine got overly warm...shoulda perhaps had a fan across it.

Desperately Seeking!! / Re: Wanted - SS50 Exhaust Baffle.
« on: January 24, 2019, 11:01:14 PM »
...thanks Woodside / sye... I’m onto it now with your helps.

Kevski.... glad to hear power’s been sapped 😱, it’s certainly not in abundance!


Desperately Seeking!! / Wanted - SS50 Exhaust Baffle.
« on: January 24, 2019, 07:02:15 AM »
Hi all,

For the first time yesterday rode my little (‘77) SS50, and thought, “Ey up, this sounds FAR too sporty for a 60yo to be out on...”

Blow me... the baffle ain’t there. And worse, it doesn’t list as a separate part # from the main exhaust.

So... can anyone come to the rescue please - I’m not sure if it’s a common part to a C50/90 etc, but basically will be abouts 24mm dia x 112mm long.

Ta, and fingers crossed,

CB350/400 / Re: CB400F only running on 2 cylinders.
« on: January 06, 2019, 11:15:30 PM »
Ian... you made me look up ‘Kettering’. Gadzooks there are some cunningly smart people about (Charles Kettering) - thanks!

CB350/400 / Re: CB400F only running on 2 cylinders.
« on: January 06, 2019, 09:20:40 AM »
Riceman, the coil primaries are energised (+ve feed) from the kill switch, ie via a black wire with white stripe - which splits into two (ie feeding each coil) within the Electrical ‘boot’ under the tank - from memory.

The current from the primary coils then flows down its respective yellow / blue wire to the contact breakers, through these... and to earth (ground).

As each breaker opens, the primary winding is de-energised, and it’s associated magnetic field collapses - inducing a high voltage in the secondary winding - which leaps to ground across the spark plug gap. Yea, boring... ZZZzzz.

Whilst I’ve never tried it, my thoughts would be to (you’ll need a basic multimeter):

(1) put a spare spark-plug into caps 1 & 2 (or 3 & 4), and ensure the body of the ‘plug is grounded. (Eg wrap a copper wire around the thread and ground the other end to the bike)
(2) disconnect the yellow and blue leads from the coils, (ie the low voltage primary circuit), turn the ignition ON, kill switch ON, and manually ground each blue / yellow to the frame in turn.
(3) Then pull the yellow / blue away - and at this instant see if you have a spark across the associated plug.

(Note: you are purely ‘handling’ the low voltage 12v primary here, and should not expect any shocks / tho’ possibly might see minuscule sparks as you break the earth (this is why you have a condenser in the circuit - it to minimise the points faces pitting through constant sparking))

If you get a healthy spark across the plug ...your fault lies elsewhere, and is not the respective coil.

If there is no spark, be sure to check the associated black / white +ve supply is indeed +12v.

Next up I’d check that when the ‘breakers ARE OPEN, the “moving” half of the breaker is 12v (with ign & kill switches ON) (See first pic) (suggest you disconnect the condenser here to minimise duff readings).

..... and that the other side of the ‘breaker has a good earth. (2nd pic)

Throughout all of this, do not energise any primary coil longer than necessary...  ie having a complete circuit across it - whether it be you holding a yellow / blue wire to earth.... or the ‘breaker closed (same thing), as you run the risk of burning out the coil.

As I’ve said, not done this trouble shoot myself, and happy to hear any thoughts.


CB750 / Re: Trying to date MM/YY of my K2
« on: January 01, 2019, 08:07:54 AM »
Thanks Joe, hadn’t thought of the CMSNL route, though there is nothing about my bike to suggest USA initial origin. It’s certainly in the DVLA system since registered mid 1972.
There is no VIN plate either, which fits in with Trig’s observation.
A CB750 reference book I have (John Wyatt) simply says the K2 types started at frame #2000001, and the K3 at 2200001 - though not stipulating end numbers.

It goes on to say the UK K2s were the early frame numbers, but doesn’t elaborate further.

So whether frame #(20) 77106 is early in the K2 run I have no idea; tho’ 1971 suggests so? it’ll be interesting to go back to CMSNL & see whether “UK” pops up as frame type.... or what.

Thanks all, hope the hangovers subsiding...

CB750 / Re: Trying to date MM/YY of my K2
« on: December 23, 2018, 12:14:54 AM »
This site never fails to deliver; thanks Bryan / Trig. 

Q. - why would the UK do away with VIN plates? My own synical guess would be the motor trade industry, not wanting Joe Soap realising that the motor he’d just bought was actually 14 months old (whatever). But yea, comments?

CB750 / Re: Trying to date MM/YY of my K2
« on: December 22, 2018, 03:10:45 AM »
Ah, well there ya go... that explains it - thanks chaps. (My 400/4 has VIN plate, but it’s a foreigner!) And thanks Ewan, so ‘she’ definitely pre-dates 10/72...

What set me onto this is that QLD Compliance is n/a to bikes pre 1975, and whilst I know the Fizzy & ‘750 both are, it’d be nice to show some proper proof.

That said, I’m impressed with the ‘can-do’ Australian system vs the bloody DVLA. A nice chap visited my garage, took photos, looked at the 3 post 1975 bikes, took $550 and 5 days later sent me alloy Compliance plates to be riveted to the frames. I told him the other 2 bikes were <1975... he took my word for it.

Next up is the Roadworthy cert - applicable to all bikes (MOT sorta thing). Spoke to ‘Mike’ who’ll do them, he’s happy to apply common sense to the Fizzy using a copy of its 10/01/1975 V5, and also use the 750’s 1973 V5 copy.
But get this... he’s too coming to the house to do all 5 Roadworthy Certs - RESULT!

Thence just admin / plates / insurances. Hopefully on the (sunny) roads early Jan.

Happy Xmas all, still interested tho’ in the dob of my K2!

CB750 / Trying to date MM/YY of my K2
« on: December 21, 2018, 11:35:58 AM »
Hi all,

Planning a new headstock plate for my K2; which is missing since PO. Anyways, frame # is CB7502077106.... can anyone please advise me how to go about getting the date of manufacture.

Unless someone has an adjacent number of course!

Ta muchly,

Project Board / Re: New (to me!) '77 CB400F - US model
« on: December 18, 2018, 10:08:35 PM »
Years ago when I used to visit the g/f in the nurses home I’d park the 400F under a fire escape. (Leeds / UK). Upon leaving one night I happened to notice pooling abouts the front end; some bloody low-life had semi-cut through the brake hose - my guess being that it looked in one piece and thus he hoped I wouldn’t notice until too late. Don’t underestimate the scum who seem to be everywhere...

CB350/400 / Re: Rear foot pegs
« on: December 14, 2018, 01:51:49 AM »
AussieKC - you sorted? As a starter for 10 I went onto eBay and searched “CB400F swing arm” and got the below. It might help? (Not suggesting you buy ‘em, but often you’ll see multiple offers from multiple angles...)

PS - if you’re anywhere near Jacobs Well (yea, I know QLD’s a big place) feel free to swing by and take measurements off my 400)


Tricks & Tips / Re: Worn kick start spindle.
« on: December 13, 2018, 12:18:19 PM »
... yea, as of 2 months ago retired here, midway between Brisbane and the Gold Coast. Early days but feel it’ll be a good decision... property indeed reasonably priced away from the city.
Think the bikes will happy... 😁x5
Have met a local with a Ruby Red K1 750; a few rides out now planned - a lot of catching up to do after 24 years in Brunei with only short visits home to Hampshire.

CB350/400 / Re: Rear foot pegs
« on: December 13, 2018, 12:00:22 PM »
Hi mattsz,

I can’t rememver where I ‘found’ the parts manual.... other than a freebie off the internet which I downloaded onto my iPad. Sadly, over the years I’ve ‘written’ to this file.... as a way of keeping track which parts have been swapped out / workshop commends etc - ie I can’t really copy it you.  But... it simply appears to be the OEM CB400F Parts manual... about 52 pages of exploded parts diagrams and thence pages of part numbers.
It’s dated mid 70s.

Anyone recognise the publication / able to help?


mattsz - have just PMd you....

Tricks & Tips / Re: Worn kick start spindle.
« on: December 13, 2018, 11:38:29 AM »
...thanks Hairy - fettled using your experience, thanks. Drilled a 3mm hole betwixt the two, then (because the drill was now blunt!) snapped it to the correct length and used it as a kinda Woodruff. Not esp elegant, but functional, almost invisible, and saved the day.

Tricks & Tips / Worn kick start spindle.
« on: December 12, 2018, 01:01:18 PM »
Hi all,

A while since I’ve posted... all bikes safely now in Oz and bloody amazingly undamaged. Cost a fortune... still not through... now need QLD Compliance certificates / thence roadworthy checks blah blah. The things we do for love eh?

ANYWAYS. My wee SS50 kick starter shaft / Kickstarter are splinelees buggers, and recently given up playing together ... and of course those parts now n/a.

(1) anyone got a spare / good condition kick starter for a ‘77 5 Speed SS50 please? (I can actually source a suitable ‘shaft)
(2) tips / tricks for fettling the problem... any mileage in attempting to drill a 3mm hole down the mating circumferences and inserting a peg?

Ta muchly,

PS - if anyone can help with a kick starter it’ll be a UK address!

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