SOHC.co.uk Forums > CB350/400

Money pit

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allankelly1:
Hi Mike

Yes it is possible but it takes a bit of work and thought

The main change as well as forks, lower sliders, modifying the discs to a four bolt mount and refurbing the CB400N calipers is that the speedo drive on a CB400N is on the other side (And also it has an angle so the speedo drive cable misses the disc) so you need to make up a new drive for the original CB400f hub and fix it to the hub on the LH side  (when sitting on the bike) rather than on the original RH side. Plus the CB400N speedo drive itself is modified (I needed to reduce its width by about 5mm so that it fits in the space left but keeping the wheel central to the forks

Some pic below of the modification











End result is rather pleasing to the eye and does not look out of place on a bike like this

Almost factory looking





If you need any more info happy to share the change in more detail

Best wishes Al


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Green1:
Looks stock I like it. Does it make a noticeable differance?
Or do you just get Twice the squeal  ;D

royhall:
Nice work there. Are those the same calipers as the 750F2? If so, they will stand that bike on it's nose.

allankelly1:
Hi Green1

No squeal yet

Not sure on the difference as when I got the bike the front end was really bad and on a strip down it was very badly maintained (Note the missing bolts) and never bothered to sort as already planned a non standard front end as the bike was never going to be standard / original bike




I am sure a well set up single would work ok  but floating fist type calipers remove the need to setup / manually adjust the inner pad clearance  to get it to work correctly and also with the CB400N pads there is more surface area so braking efficiency is improved

Also with the modification should you wish I think this change will give you more disc options (EBC) and other better pad materials to chose from if you need something better

Never understood why Honda used such a basic/ primitive setup and you can understand when the RD350LC came out in 1980 it was such a success as the brakes on my RD are really the same as on the modified Honda but just fitted with EBC full floaters to improve things without the need to change over to a more modern calipers as want to still keep the period look




Stay safe all

Best wishes Al


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Laverda Dave:
This is what I err,..... purchased to begin my 400/4 restoration in 2016. The previous owner bought a 'complete' (or so he thought) 400/4, stripped it down into several lumps and lost interest.
I bought it on eBay and spent two years restoring it. Anything can be restored if you throw time and money at it, just don't expect to get either back! I would definitely do it again though, great fun and I learnt a lot.

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