12 Tooth sprocket speedometer correction

I Have completed one mod to my WRR. I shaved that extra large black ugly thing that held tail light, turn signals etc. Big improvement! I will try and post some pictures, used original components.
Now on to my next mod. 12 tooth sprocket, is there a way to correct the speedometer after this new sprocket is installed?

I now have 450 miles and just did the first oil change using Amsoil, any comments?

One other mod, shortened front brake lever (unintentional), ordered replacement.

Any help on the speedometer would be appreciated.

Thanks, G-MAN.

See SheWolf's post number two in this thread ...

https://wr250rforum.forumotion.com/oh-those-sweet-mods-f5/front-sprocket-change-and-odometer-speedomter-t2462.htm

Thank You