need a bit of info rebuilding a 2002honda400ex

so i did a compression test i let it warm up for about 5 min i did the compression test twice and getting 100 psi the manual says 100 to 128 psi

so i am going to get it bored to a 416 wiseco 87mm 11 to 1 compression piston and give it a Honda crf450r timing chain and of course new gaskets
now for the big question do i take the auto decompression mechanism off the cam and run it like that or leave it on — the stock cam is like new

any info would be great