Wrong. Jetting IE: amount of fuel burned has little or no Effect on Octane requirements. Octane or detonation supression is simply a function of compression and combustion chamber design. There has been no such changes in this area in the EX since it's inseption in 1988. those engines and 07s are happy with 87 octane. Now if you live in Bangladesch or Somilia. 87 octane may mean somthing else. but here in the good ol U S of A you'll be fine.Revort said:Similar question: If my bike was jetted I should use 91 too right?