Mine have become brittle and broken along with the vent lines, david silvers dont have these in stock is there generic type hose i can use?

If you mean the pipes from the pump to the carbs then you can use any plastic or rubber type oil piping. I went for the clear type.
I often use my local bike spares shop http://www.ridersmotorcycles.co.uk/Scripts/default.asp.
The chap that runs it used to import NEW Jap bikes and has a wide knowledge of most things Jap 2 stroke.

Hope this helps.

Mike
_________________
I don't mind dying...I just don't want to be there when it happens!

The magic word is bulk tube.
I think this is what you are looking for:
95005-3000150M
It's one meter and costs around 9 Euros. Inner diameter is 3 mm, outer around 6.5 mm (the correct clip is the B6.5 type).
You need two pieces, 140 and 160 mm.

Most of the air tube is 95005-5500120M (inner dia 5.3 mm) except for one 30 mm piece which should be from 95005-3500120M.

I agree, Clear Tubing is the way to go
Being able to see the injector oil in the tube is so comforting and a piece of mind!

I have seen clear air tubing and also the clear tubing used for automotive window washer fluid routed to the spray nozzles on the bonnet.