Do you have to mix fuel or can you use 93 octane ? If you do have to mix were do you get the racing fuel mix? I don't have a 440ex i was just wondering.

 

Depends on your compression ratio. I BELIEVE not set in stone so no one spank my peepee on here but I believe 12:1 is as high as you can go on pump gas

 

You may be able to run pump gas with a 12:1. Most of the time 11:1 is the highest compression you want to run on pump gas with the 400ex.

 

Where do you find racing fuel? Do you mix it with gas?

 

Call some of your local power sports shops to see if they carry VP or related fuel products. We carried for high performance/high compression dirt bikes and atvs.Most would mix VP 108 with premium fuel at a 50/50 ratio. Ain't cheap by any means! http://www.vpracingfuels.com/page469675.html