SOHC.co.uk Forums > CB350/400

Fork oil renewal

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cliff7:
Decided to change front fork oil. Drained both no problem. Looked like relatively clean ATF to me. Anyway, on removing filler cap I expected to see the spring but about an inch below the top of the stanchion is what looks like some sort of plug with an internal hexagon about 13mm and there is no way I can pour the oil in. Any idea what is wrong please.
1978 CB400F2

Nurse Julie:
It's not a standard fit but I have heard other people have fitted a plug to push the springs down, must have something to do with pre load, or damping or something similar 🤔🤔

Nurse Julie:
Here's a pic of what I think it is, maybe not exactly the same as yours but similar possibly

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Nurse Julie:
This is the type my friends have been fitting

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cliff7:
Thanks. I'll see if I can undo it. (13mm hex key). I know a previous owner fiddled with the bike as the drive sprockets are not standard either (higher gearing).

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