SOHC.co.uk Forums > CB350/400

stripped camshaft sprocket thread fix/workaround

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TrickyMicky:
Part No. 90081246000.     7x12 Bolt. DSS has them in stock.

taysidedragon:

--- Quote from: Dolomite_ on June 20, 2024, 10:29:34 PM ---After my initial panic has settled, I think it actually is the bolt that stripped. What are the original bolts made of?

Hopefully, I can find a suitable bolt so I can get it up and running this weekend.

Out of interest, what are the camshafts made from?

--- End quote ---

The original bolts are high tensile steel. Don't be tempted to use an ordinary mild steel bolt, that may be what a previous owner has used and has now stripped.

Bryanj:
Camshafts are meonitic cast iron

Laverda Dave:

--- Quote from: Bryanj on June 21, 2024, 12:31:03 AM ---Camshafts are meonitic cast iron

--- End quote ---

Are Honda camshafts cold chilled Bryan or did Honda actually apply a surface finish such as case hardening? I remember a good few years ago having a worn 400/4 cam stellite treated and re ground after being told Honda didn't use case hardening.

K2-K6:
They are, effectively "case hardened" but more realistic to call it "peripheral" in how we understand metal treatment.

It's the propagation of molecular structure through the chilling process that controls the change in outer layer to give more resistance to wear.

"Case" usually refers to adding carbon etc into the surface of steel to change that outer surface similarly, but its fundamentally a different process with that addition to alter the metallurgy as opposed to re arrangement of already existing internal mix of the casting batch by chilling in manufacture.

Most production camshaft for years are the same, don't think Honda had used anything different.

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