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Castellated clutch nut removal

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buxtonmick:
Righto, now I'm getting stuck into my project and, like someone said somewhere "an old motorbike is like a box of chocolates..."  Apart from two scored cylinders from broken rings and two snapped exhaust studs (any tips and/or ideas welcome), I've now got to the clutch removal bit.  I've got the tool to fit the nut but will it move?  Nowt.  So before I try anything of my own invention does anyone have the knack to this, namely, how to hold the centre from turning? ??? ???

Cheers, Mick.

Seamus:
May be wrong, but the centre drives the gearbox. So put it in gear and put the chain round the drive sprocket. Lock the chain using a screwdriver through the links and a bit of wood between the motor and the screwdriver, this should hold while you undo the centre nut. Take care where the motor is being loaded from the wood.

Worked for me on the 750

UKROBK7:
I agree, on the 750 I have done that.  If the engine is out of the frame you will have to lock the drive sprocket using the chain method but I have found that the tool etc that you use to lock the chain can bend as the chain is quite narrow to get anything decent through it. 

Having done that:

Check to make sure lock washer is undone completely (mine had one of the ears broken off short and was difficult to see that it was still locked up).
Put it into gear
Use a breaker bar or good T bar on the special tool (I ground an old socket down to fit)
Give the end of the bar a sharp belt with copper mallet!  The impact will free it better than just putting pressure on the bar.

Or, if you are a bit more professional use a rattle gun!

If the engine is apart I think you will have to come up with an idea to hold the mainshaft safely without damaging the gears.

Rob

buxtonmick:
Thanks for the help folks - I knew there was something not quite right!  The thing still won't move though, the clutch slips.  i've left penetrating oil on it and I'll have another go at weekend.  Aaargh!!!! >:(

UKROBK7:
I don't understand the clutch slipping bit.  If I am correct (not often according to my wife!) the nut is on the mainshaft.  When you put it in gear the mainshaft is connected via the layshaft (countershaft) to the drive sprocket.  So when its in gear and you are trying to undo the nut with the sprocket jammed the clutch doesn't come into it (unless as I said, I am wrong!).  I have had a look at the parts diagram for the 400 but can't see what the problem might be.

Rob

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