I don't think the decompression only goes with kickstart models, at least for US models.
In the US the newer LX, and LT, GT200 have the decompression but have no kickstarter.
Does the cam for the non-decompression setup have the hole in it for the mechanism? I'm seeing two part numbers for the LT125 cam 8459305 (without decompression it looks like, listing only shows 125 models) and 8459325 (listing 125, 150, and 200 models, most likely with decompression).
I'd be worried about rocker and pad wear if the decompression bit was just removed.