What fuel should I use in my CT90 / Trail 90? March 03, 2025 21:59 Updated We recommend premium (92+ octane) fuel; if it can be found non-ethanol fuel as well. Related to CT90 fuel Related articles What is the fuel capacity of a Honda CT90 / Trail 90? What is the carburetor float height for my Honda CT90 / Trail 90? What engine oil should I use on my Honda CT90 / Trail 90? Installing a Regulator / Rectifier on the Honda CT90 / Trail 90 How often do I need to change the oil on my Honda CT90 / Trail 90?