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350 and 400 clutch baskets

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Orcade-Ian:
Just building up this red 400/4 and was trawling through a box with clutch stuff.  I have a very low mileage clutch from a spare 350 engine and the 400 clutch which came from the red bike originally.  The 350 clutch basket (different part number from 400) has the identical top hat centre bush but it runs in a bronze bush, whereas the 400 centre bush runs direct in the alloy basket.  Dimensionally identical - and never seen a 400 one badly worn in the bore but as an engineer I’m tempted to use the one with the bronze bush as its as new.  Outer pressure plate is different as the 350 uses a circlip to hold the assembly onto the shaft, rather than the locknut, belville washer and lock tab.  Any idea why mother Honda changed the design and deleted the bronze bush?  Just not necessary perhaps?

Ian

AshimotoK0:
Probably cost saving Ian. The CB160 cam covers/bearings had bronze bushes in them but the almost identical setup on the CD175 sloper was just plain alloy.

Bryanj:
Probably cost lick the jis screws, each one is a fraction of a penny cheaper than the flanged bolts but when you use millions!

Orcade-Ian:
Yes, must be down to the bean counters - just wondered if there had been a problem with the bronze bush in service but my 350 never makes any untoward noises when the clutch is operated, which is the only time the basket spins on the shaft.  Think I’ll use the 350 version as it really does look like new and even the gear-hobbing marks are still evident.  Living here in Orkney I’m not going to be thrashing it up and down the M1 anytime soon.

Ian

taysidedragon:

--- Quote from: orcadian on January 29, 2020, 09:08:28 AM ---Yes, must be down to the bean counters - just wondered if there had been a problem with the bronze bush in service but my 350 never makes any untoward noises when the clutch is operated, which is the only time the basket spins on the shaft.  Think I’ll use the 350 version as it really does look like new and even the gear-hobbing marks are still evident.  Living here in Orkney I’m not going to be thrashing it up and down the M1 anytime soon.

Ian

--- End quote ---
Good decision. 👍

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