I'm actually trying Golden Spectro @ 40/1 after using Torco's GP7 for a couple of years. So far I'm liking the results. The GP7 was good stuff, and a top-end inspection on one of my other bikes, showed good results. But I felt the bikes that used the GP7 required more jetting changes than the Spectro. Especially with my KTM 300. I will not know the end result of my premix change though until major engine inspection time rolls around at the end of this year.