Tuners who have learned their way around the inside of motorcycle engines understand that there is big power to be made by altering an engine’s internals. However, they also are aware of the compromises that are inherent in each of the modifications. Getting a bike that is a fire-breathing beast – and not an unrideable monster – requires the right balance of the quirks each modification brings to the party.

Newbies should stay away from splitting the cases.