Some performance-enhancing substances are completely legal.

Bel-Ray doesn’t just lubricate your bike’s moving parts, it brings your engine to life. 
Pistons pump more efficiently, gears interact with greater purpose, bike chains perform the way they’re supposed to - everything becomes more agile, all elements move in harmony. Bel-Ray unleashes your bike’s full potential, while increasing the life-span of each moving part. There’s less friction, so there’s less abrasive wear and your engine runs cleaner too.
When it matters what goes into your bike, use Bel-Ray total performance lubricants. Flex Your Engine.