They make servicing the top end so much easier. They are well built and have additional attachments avallible.
HP Tools VALVE SPRING COMPRESSOR
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Purchased this tool for our CRF250X and found that the tool worked very well, easy to use, and price was most reasonable.
work great if you have a four stroke you must have one of these.
I used this compressor kit on a Honda CB350 twin head and a Honda CB400F head. It worked perfectly on both heads, and it was very easy to access the retainer clips. I highly recommend this kit.
I saw another kit that included two smaller attachments for smaller valves. I really don't know what use those smaller attachments would be since the CB400F valves are the smallest I have ever seen, and the attachments in this kit were perfectly sized.