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Topics - AshimotoK0

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CB500/550 / CB500K0 Oil Guide B
« on: March 27, 2020, 11:00:02 AM »
Decided to use the lockdown period to attempt to put together a couple of my engines starting with the CB500K0.

Problem is there are bound to be niggly little bits I need for any of my engines.

First up is 'Oil Guide B'. My CB500K0 frame no. is 1000896 and this changed at 1000899 from 11203-323-000 to the -010 part.
Mine seems to be torn at either end  (see pic) although on the rest of it it still seems still very flexible. I can't find much on any forums about this guide. I can't find the -010 part (only a used one in the States) but I can find the early part NOS but again in the States and not sure how long this would take to get here plus it's going to be around 50 quid landed if Parcelforce get their hands on it.

Does anyone have experience of this part or have one to sell? Will the later -010 part fit my engine .. not that I can find one NOS?

Good news is that the rest of the bottom end including the shifter forks are fine. The countershaft weird needle roller bearing was starting to break up and had started to mark the countershaft but I managed to get a NOS bearing and a replacement shaft (anyone who doesn't know .. this and the shift mechanism was the Achilles heel of the early CB500K0 ...early square crankcase engines and resulted in a Class Action court case in the USA against Honda in 1971).

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CB500/550 / Pinched this image off FaceBook
« on: March 26, 2020, 05:55:45 PM »
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Been looking for a .pdf copy of BB shop manual for yonks .. added now (we already had PartsBook & 5-Shop Manual)

HONDA CB450K0 Black Bomber Shop Manual

CB450 DOHC Shop Manual 1968 5-Speed

CB450 K0 Black Bomber Parts Manual

Other Bikes / Nice Video Clip of 1968 Honda Museum CB250 Dream JDM
« on: March 17, 2020, 10:21:33 AM »

I am building one of these.  I found this really nice little video clip of the Honda Japan Museum one.

just got RS Bikepaints to mix the correct paint for it .. Black Metallic ( more a dark grey metallic) Same code as CD175A sloper Honda suffix 'XE' on parts

CB350/400 / Refurbed 400/4 Headers - Now on eBay !!
« on: March 13, 2020, 02:25:36 PM »
My mate Graham has just got these back from the chromers (Genuine not repro) and he is selling one set only ....if anyone is interested I can put you in touch. You will have to be quick though as it's an eBay  £1 final fee listing weekend and he did mention putting them on there.  I think  he also has the rechromed original clamps and insulator sleeves for them too

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Desperately Seeking!! / CB72/77 fork lower shroud (LHS)
« on: March 10, 2020, 12:08:06 PM »
Does anyone in UK have a decent L.H. lower fork cover to sell me for a 1964 CB72 please? I think the P/N is 51612-268-030. Must be in UK. Not bothered about colour or minor repairs as I am repainting everything on the bike anyway.

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Misc / Open / Thoughts on preventing newly de-rusted tank from corrosion.
« on: February 25, 2020, 02:39:22 PM »
After the fantastic response to me asking about removing stubborn carb drain screws....

What's everyones favourite treatment for the inside of fuel tanks after de-rusting (assuming the tank is not going to be filled with fuel for a long time). Anyone know how Honda did this ? .. I just looked at the inside of a 52 year old NOS tank that was missing it's original tape over the filler hole but absolutely no signs of corrosion whatsoever. I am having this tank painted another colour and amazed how thin the original Honda paint is, with no obvious evidence of any form of primer, yet the paint finish is blemish free (original finish was  metallic not candy paint)

Anorak's Corner / Orange/Red paint on switches
« on: February 20, 2020, 11:39:16 AM »
When finishing off  refurbing my CB750 10/69 UK diecast RH bar switch (pretty knackered to begin with,  as bike had 46k on the clock and used through many UK winters  :(  ) I found that the engravings with the red/orange paint were really shallow compared with a NOS K1 UK switch I have (pictured next to K0 one)  and the normal paint I use (Humbrol model enamel 209) didn't really stand out very well because of the shallow engravings. So I filled with paint, wiped of the excess and  whilst still wet, I  sprinkled some orange/red pigment powder onto it (see link), dusted off the excess with melamine foam  and forced it into the wet paint and it looks a lot more distinct now. These switches are mega rare because they have the centre 'P' mark unlike the USA ones. Also I found that the NOS black kill switch knob I had,  had a very slightly shorter length shaft on it compared with the original UK K0 one,  so I had to modify the top aluminium body to get the circlip on ! (the black knob came from a USA style K1 switch with the dual throttle cable arrangement .. I didn't even know K1-s ever had the black knob but there you go.)

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As title .. any tips on removong without shearing off  ?

CB750 / Nice bike just reminded seller its not a K1 !
« on: February 16, 2020, 08:55:52 PM »
Remember this bike going for a song on eBay a few years back (from memory about £7K) .. lovely restoration. Just messaged seller (original restoration company) that  its not a K1?  There was a feature on it in one of the mags .. think owner was an Elvis lookalike .

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Misc / Open / 1961 style coil
« on: January 31, 2020, 08:18:31 PM »
Take a look at this 1961 coil from the CB92 I am restoring. Note that it is very similar in design to the later Honda coils but has much better fatigue protection of the HT coils coming out of the plastic encapsulation by having little wrap around steel brackets. Why the hell did they stop doing that? Much better design IMHO.

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CB350/400 / Original BZP finish on CB400F carbs?
« on: January 30, 2020, 01:13:32 PM »
Not sure about the original BZP finish on CB400F carbs when new ... chrome passivated or not. Anyone know? Or could it be either?

Confused because NOS carbs below has yellow chromate passivate but NOS spare parts don't. :-\

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Other Bikes / CB250K0 at Newark Yesterday
« on: January 27, 2020, 12:13:49 PM »
This August 1969 'H' registration CB250SS (K0) was at Newark Autojumble yesterday. Totally original as far as I could tell (Apart from reflector on rear mudguard/fender)... Just under 10k Miles on speedo. Seller was asking £2,000. Said it came from someones estate I think. I suppose if you were to just to get it running and tidy up to use then that might be a fair price but the photo's do flatter the condition somewhat so to totally restore it may make it a bit of a money pit. Pipes were pretty solid though and a rare sight at an autojumble in the UK. :) Last taxed in July 1985 according to DVLA ... Just noticed gearchange lever is not correct :)

I wasn't interested .. already have 3 ... don't need another one or any other bike for that matter  ;D ;D

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The Black Bomber Board / CB450D at Mecum
« on: January 27, 2020, 12:03:17 PM »

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