I have a high comp piston in my 350x with a goki starter. Works fine. You have to get to decomp to work right or the goki won't work. If it's chattering on the cam you are close, back it of just enough so it 's not hitting the cam when the engine is running. Next , you have to make sure the kick starter is in the right position when you hit the starter button. The decomp has to be open before you hit the button. Also, you have to use the battery that is in the instructions, it's a big one, the smaller ones don't have the cranking amps that you need.
I ended up re-routing the whole decomp thing so i now have a lever on the handlebars to operate it. I also changed my run/off / headlight switch to 400ex switch that has a stater button. The button they give you in the goki kit works, but it looks silly and doesn't mount in a user friendly spot.
YAMAHA 450 HYBRID
85 350X- RED
85 350x -BLACK
86 350x-WHITE (with Goki)
85 250r
83 atc 70
84 atc 70
84 atc 110
09 yfz 450
2006 Arctic Cat Prowler
RZR XP 900