Just did this on my 55W with an experienced mate looking over my shoulder.
Put the new cable in (It's pretty obvious how it fits - I found it easier to put the bottom end in first).
To adjust - undo the right hand exhaust valve cover. Turn the engine over with the kick start until you find the point at which you can wiggle the rocker. You now know that the exhaust valve is closed. Adjust the cable so that there are a few mms (say 5mm) of play before it goes tight. Turn the engine over a few times with the kick start (should be easy now). Close the cover - job done. With the adjustment, you are just making sure that the valve is not being held open by the decompression cable hense if the valve is closed and there is a few mms of play in the cable you know that the cable is not holding the valve open. Note: you should check the adjustment of the cable every time you adjust the rockers.
Hope this helps
Muro
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