SOHC.co.uk Forums > Project Board
1967 CB450K0 Black Bomber Rebuild - By Royhall
royhall:
Thanks for the Info Ash. My fork legs do indeed mike up at 1.297" so all is well there.
The next little project is to get over the problem with air filters. The 450K0 had a pair of air filters that were unique to that model. They were changed for the K1 model and then stayed the same over the life of the 450. Problem is that the K1 items do not directly fit to the K0. The battery box is welded as part of the frame on the K0 but was changed to a removable item from K1 onwards. The filters are the same except for the crossover link fittings between the two filters, as per the photo's.
[ Guests cannot view attachments ]
My old existing filters are no longer serviceable due to rust and damaged elements, along with mountains of muck. As the K0 filters are no longer available, I decided that the way forward was to use K1 filters and adapt the link pipes. The K0 link pipes are longer and join together directly with a rubber seal. The K1 link pipes are both short and join through a steel oval tube that's welded as part of the later battery box. So the idea is to get a later battery box and remove the tube where it's spot welded on, and TIG up the four holes. This can then be used as a loose connector pipe fitted with a pair of K1 seals, which came at enormous cost from an American company called Clauss Studio's. I managed to get a K4 battery box on eBay for less than £8 including P&P.
[ Guests cannot view attachments ]
[ Guests cannot view attachments ]
As the filters fit rigidly to the frame I don't think any further atattchments for the link pipe will be required, but if it isn't quite rigid enough I will drill through both air boxes where the centre of the link pipe sits and bolt them together with a length of stainless thread bar and nylock nuts. I doubt that will be required though.
The rubbers on the air boxes were both perished and not reusable. Again at great cost I managed to obtain a pair from Clauss Studio's. The old rubbers came off the air boxes without too much fight and the adhesive was easily cleaned off with a blade. The new pattern rubbers fitted very well so I bonded them on with flexible non silicone construction adhesive that took nearly a week to set (strange) but has now stuck well.
[ Guests cannot view attachments ]
After giving all the parts a good clean they came out like new, well almost.
[ Guests cannot view attachments ]
royhall:
Just a few more pictures from the last section on air filters. The first picture is the adhesive that successfully bonded the rubber parts to the plastic air boxes.
[ Guests cannot view attachments ]
The rebonded air intake rubbers.
[ Guests cannot view attachments ]
Ready for assembly.
[ Guests cannot view attachments ]
AshimotoK0:
Great info Roy.
My frame is already painted with the welded in battery box. Do you reckon the K1 filters will fit witha the oval tubes taken from the old K0 ones. Also the bracket is slightly shallower .
See this link... second post Roy
https://www.hondatwins.net/threads/1966-cb450-k0-bill.130522/?fbclid=IwAR26dGlmiz-EgBhvlhoTJILCQfnhvEsJ-zAmZbRQZfarDVQybQRqb-ExT1A
royhall:
It will fit Ash. With the K0 box not being as deep there is space under the battery box for the K1 cross link tube. I don't intend to weld or bolt the cross tube to the frame, just going to leave it loose trapped between the filters or at worst with a bolt through the tube. The filter location bolt is just above the tube and the filter has a pipe through it so the filter is bolted rigidly. My thinking is this fix doesn't alter the K0 frame so if the correct filters appear just down the road it can be returned to standard.
Had a look at the link about the air filters and my reaction to that is "what a bodge job". Why go to all that trouble to produce a poor outcome when you can take the tube straight off a later box and use the standard rubber seals. I haven't finished mine yet but I have dry fitted it and it looks like it's going to work well. Or I could just McGuyver it with gaffer tape. Not impressed at all with the quality of that. By the way, there are tons of later battery boxes coming up on eBay for next to no money.
I can't post a picture of the filters and tube fitted, as the frame is away for powder coat and the seals have been trapped at Los Angeles airport for nearly three weeks as there are no flights. So stop winging Branson and get the seats out of your jets and go and ship the cargo backlog mountain. ;D
AshimotoK0:
This is the relevant text and pictures from the Honda Twins posting Roy
"Both K0 bikes I have are missing original air filters and filter casings. One of the bikes came with a set of Uni clamp on filters, but I figured I'd try for a more stock configuration. Considering I now had a set of original 1966 K0 air filters to use as a template I decided to purchase a set of 1971 CB450 air filters to modify to match the originals.
I walked the aisles of Lowes until I came across a piece of 4" air duct that I could use to build the bridge between the vents of the 1971 air filters.
I then shaped the thin metal duct with my hands by wrapping it around the outside of the 1971 CB450 duct vents.
I then taped the duct to hold its shape and drilled 2 small holes at one end to permanently affix to one side of the 1971 air filter with rivits. I also shortened the length of the tube with a Dremel cutting wheel to match the spacing of the original K0 filters.
This was very easy and worked out much better than I had planned."
[ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ]
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version