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Discussion Starter · #1 ·
I have a 2010 ninja ex250 special edition, owner's manual says to use 87 octane gas...

However, I have put -

a K&n highflow air filter
Yoshimura stainless TRC exhaust
Dynojet stage 2 jetkit

(+ a ton of other mods, but they aren't engine related)

and might add performance f/r sprockets soon.

With all these mods that increase HP and torque, do you think I can get any kind of performance boost from using 89 octane gas, instead of 87?

I use 20w50 oil instead of 10w40 and that seems to make the bike run a bit better.
 
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