No decompression valve that I know of. Is it one of the little 12 inch 25 cc arborist saws (really light that you can carry up a tree) or one of the bigger 41cc 16 inch bar ones?
The little arborist ones aren't difficult to pull start, but they do feel a bit harder than an equivalent sized line trimmer - but a bit easier than a trimmer without a clutch. They must be high comp to wring more power out of the little engine.
