Castrol Powe 4T for me, in 5w-40. They do oil very well.
POWER1 4T Engine Oil with Trizone Technology™ is a premium-quality, full synthetic 4-stroke motorcycle oil designed to ensure maximum power and performance, even under the most demanding riding conditions. Its anti-friction formulation is proven to increase acceleration compared to conventional motorcycle oils.
Castrol POWER1 4T with Power Release Formula is designed specifically for bikers who love the exhilaration of riding.
It has been tested and proven to deliver superior acceleration at the touch of the throttle as it flows fast and minimizes internal engine friction.
Advanced, full synthetic, premium quality engine oil designed for 4-stroke motorcycles.
Exceeds Specifications API SL, JASO MA-2