These three dirt bikes feature 450cc single-cylinder liquid-cooled four-stroke engines with a 13.5:1 compression ratio. They all use a close-ratio 5-speed transmission and weigh between 247 and ...

Does it have spark? Will the seller let you do a compression test? What kind of details can the seller give you about the bike and the life it's lived? If it's running and you can test it ...

Although the most successful Honda motorcycles are road bike-heavy, the dirt bikes are no slouches ... Honda lists a 450cc motor with a compression ratio of 13.5:1 for the 450RX while the ...