SOHC.co.uk Forums > CB350/400
CB400F Carb overhaul
Bryanj:
323 middle number is oruginaly 500 four
K2-K6:
Lobo, your question about the complexity of the 400/4 carb linkage versus the CB750; the carb slide travelling vertically is lifted by the rotating arms so giving two seperate paths of travel...the sliding action of the lifter forks is fairly crude in it's junction with the slides and maybe a bit high on friction but very simple and, it seems, without many real problems even after all these years.
The 400 one however, when you remove that single sliding link, then needs an elbow to connect the two different paths of travel. To maintain a stability and parity between each linkage then simply requires a far more detailed set of components (as you've found) and although it may offer a solution in pure technical terms it may have lost sight of any advantage it could hold.
Honda certainly do this fairly often.....a good example is the enclosed disc brakes used of a CBX550...have a look to see how complicated they made those !!
Lynx:
The German guy selling the spring steel replacements on eBay will do a Buy It Now price and will take payment by PayPal. Mine arrived in super quick time.
Lobo:
Thanks gents... Lynx ta, but a day after starting my own ss connectors found a couple of 2nd hand ones on ebay which will do the trick.
K2, yup still confused as to 'why?!'. This linkage mechanism would have had to get past many folk in Honda including the accountants, each who will have been aware of the extra complexity & cost...aware too a simpler in-house solution that was working fine on their '750.
As for friction...I'm not convinced, there are so many extra components in this deign that the summation of system friction is surely greater. Certainly to my non-calibrated oaf hands there is no appreciable difference.
The only thought I have is perhaps an effort to minimise/delete all slop/play arriving at the slider. The 750 K1 (onwards) fork lifter both pulled & pushed - though any play here could have been easily 'sorted' with a 'big' spring against the slider (a-la earlier K0?). The 400's system with spring clamped elbows / connectors etc presumably keeps all slop out, and therefore the carbs balanced at all times.
BUT, whilst I'm curious I'm no engineer... always keen to learn, and just guessing..
Bryanj:
Ah, but the carbs were not a Honda part but bought in as an assembly at an agreed price
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