Not a GasGas conversion.....I am using .48 on my 2005 YZ125 KYB forks. I am also 195-197lbs, being a fast "B" SSR. I also have oversized tank 3.2 gallon tank on my 125. I had .44 when I bought the bike. I tried them, but was bottoming, so I bumped them to .48. I ride standing up most of the time, my style is more over the bars.
The YZ is much lighter than a GasGas, my valving has been softened up for more offroad, vise moto.
Hope that helps.