l was riding my cb 450 this weekend and when l pulled in the clutch l could feel a clicking.Then it seems the clutch cable snapped.The clutch handle would not spring back.Any advice or reference websites anyone can suggest on how to replace?Is it an easy fix or should l take it into the shop?Any advice would be great, Thanks.

Go to shop buy cable, they will tell you in 3 minutes or less how to change and adjust, its real real easy.

A CB 450 was my first bike, (loooong ago!).
That is a good old bike.
You will need to remove the tank.
Start at the hand-lever. Disconnect the old cable.
There is a 'puck' on the cable end that fits the handle.
You must turn the cable to get it out of the slot.
(Just look carefully, u will see how.)
turn the handle adjuster all the way in leaving max. clearance.
Install the end of the new cable.
then work down the old cable, removing it & putting the
new one in its place until u get down to the engine case.
You will have to remove the left case cover.
(An impact driver is suggested for those phillips head bolts.
they WILL be frozen in place, & a screw driver will
likely strip the heads.)
Loosen the clutch adjuster to give u maximum play,
(screw the collar all the way in), & remove the old cable.
If u watch how it comes off it is easy to get the new one on.
There is a slotted box fitting that the 'puck' fits into.
Reinstall the side case cover, (it is a good idea to oil
the threads of those bolts before inserting them so that
they stick less next time), & adjust the clutch play
at the side cover, (that slotted round plug), by loosening
the holding bolt, turning the plug untill you've got
tension, & retightening the bolt.
You should be done.
You can fine tune the tension with the lever
adjuster.