flandersander
Member
I just bought a rmz 250, and the guy before me always ran premium. I don't have really any access to premium fuel. So to run regular, do I need to jet it up or down, or can I just run it?
The only way you might get away with 87 octane is if you run at 3000 feet elvation or higher.
If your jetted right altitude dont matterNo. It's not a mixture thing....it's a cylinder pressure thing. High performance usually means higher compression. High compression requires high octane. If you are riding at high elevation, the air density/air pressure is less and therefore your final cylinder pressure is lower and you can run lower octane fuel.
Actualy no that is what you were saying.