Switching to racing gas?

[shovelhead]

Ok I am getting ready to fill my tank for first time with 110 Gas . Do I need to drain out old 89 gas first or just gas & go?

[AustinTX]

Ok I am getting ready to fill my tank for first time with 110 Gas . Do I need to drain out old 89 gas first or just gas & go?

Unless you bumped your compression up to where you need the 110 octane, then no you don't have, to drain out the old gas. But I would If the 89 isn't fresh. I would drain it any way, just because I am kinda OCD like that.

[Wildcardracing]

89??? First, I would run no less than 91 in my bike. Second, what have you done modification wise to need race fuel...timing...compression?? Fact is that race fuel will actually hurt your performance if your bike doesn't require it. All high octane does is makes your fuel burn slower and ignite at higher pressures and temps, therefore it is less volatile...Pump gas can have some very impressive results when set up correctly. I personally don't see bumping your compression and timing to the point you need race fuel unless you strictly ride tight trails and need all the bottom end you can get. I like my $$ too much to waste it on 110

[shovelhead]

I will just drain it out & start fresh. Yes I do need the 110

 

Thanks

[rusty1100]

I think I was told that even the manual said to run 91-93, is that right?

[KaosBanshee44]

I will just drain it out & start fresh. Yes I do need the 110

 

Thanks

 

What are your mods? I hope you have some stuff done well some performance stuff done to switch.