Many thanks guys for your fast replies.

My lack of tech experience means I am back again. This time I have uploaded a photo which I didn't realise earlier that I could do.
As hopefully you can see I only have one brass rod tipped wire - the only other wire has the eyelet connection that bolts to the engine casing. Also I can't see any holes under the filter hose. Could you give me more exact location.


Turning to hoses - you can see that currently the hose from what I take to be the decompressor is connected to the carby diaphram cover. I'm pretty sure I haven't mixed up the hoses so could I ask you to let me know if that is correct.

I have marked with black tape the vacuum tube hose that emerges from the cowling. You can also see the broken white plastic pipe in the carby body. I don't think it is possible to attach anything so I am wondering if it is possible to drill out the buried bit and fit a replacement.

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