I was wondering if any of the 426/450's had a auto decompression built in.
03 and new.
But you can retro fit the older ones with a newer cam to get the auto.
'03 and newer, as he said. That includes all YZ450's. Also as pointed out, the upgrade of a 400/426 to auto decompression is both easy and inexpensive.
Here's the instruction sheet
Total parts required: 1 '03 or later YZ450 cam, OR one aftermarket auto decomp upgrade cam.
Read through some of the rest of the thread the instruction sheet is in. All kinds of details are in there.
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