Nuts, chains and sprockets.

[lds1973]

Up one or down one on the front is more noticeable than up one or down one on the back obviously but its also cheaper that way. A front sprocket is 15 quid where a decent rear can be 30. Going down one on the front is a quick way of giving you much better acceleration but at the loss of top end ( who does 130mph anyway) just make sure you have the clearance round the swingarm though. Also a smaller front sprocket will wear your chain out a little quicker as it is going around a tighter corner faster more of the time.

Be kind to your wallet and adjust front only. Its also and easier job.