1 mile is 1609.34 meters so a quarter mile is 402.34 meters. SO for rooster if he can run 16 secs in 400meters he can do that.
Rooster I suggest go for CDI, cam, 28mm carb, dbs pipe and a lot of tuning. Plus front tire 45/90 tire and rear 50/90 on alloy rims. Sprocket try 39 to 36 variations.
If that is not enough add 58mm bore with flat head piston and tuning. It can break the 16s easily.
The most important part is tuning.
Make sure you lighten the bike by removing fairings, gas tank (use soda bottle), alloy swing arm.