SOHC.co.uk Forums > CB350/400
CB400F Carb overhaul
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
K2-K6:
I thought that after I'd replied Bryan, they usually use Kiehin or have done historically.....but the design spec would usually go out to the supplier and then test and approval would happen during development prior to ramping up for production once it met expectations.
Lobo, you're right in the sense that looking back on it now, then it seems to offer complication along with no really significant and obvious advance over the 750 spec......saying that though, it's easier to look back and see that now........also during original design the thought that they would last this long and someone would want to renovate them just didn't seem to exist in the manufacturing proccess then.....doubt it does now either.
Also we were seeing some of the last pure slide operated carbs generally at that time as development was heading toward CV type carbs for road bikes in which the throttle just opens a butterfly flap with the slide just opened via a vaccum circuit....these sohc motors being design decendants of the sixties Honda road racers, with Honda's managment keen to show any level of sophistication as a marketing plan/advantage.
mickwinf:
now parts are available from gerbens1956 http://www.ebay.co.uk/itm/Honda-CB500-CB550-CB350-CB400-Four-set-reproduced-carb-stabilizer-springs-/121073360635?pt=UK_Motorcycle_Parts&hash=item1c3088defb and he speaks english!!
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