Don't go with a plug chop. That worked with the tetra ethyl lead in fuels but now all you see for color is the fuel additive packages which can't be used for determining mixture.
Try this for determining the high speed jet. It's more accurate than plug chops. If the engine doesn't have cams, head work or higher compression, the 205 is too big.
Run the bike through the gears into third gear and run third up to 60-70 MPH full throttle, then chop the throttle about 1/8 to 1/4 back and see if the bike either surges ahead or stumbles then recovers.
If it surges ahead, your jetting is lean
If it stumbles and recovers , your jetting is rich
If it makes no difference, you're pretty close.