Please don't take this into a debate about the cost of fuel, I probably only used about 1 to 1-1/2 gallon for a hour and half track ride. The cost difference for the day was really only like 10 to 15 dollar difference between pump fuel and race gas. I don't get to ride too often so long term the cost will probably be only 100-200 dollar difference a year, maybe. Plus the metal can for fuel storage will be used for the lawn equipment.
All I can say is I noticed a much crisper throttle response, well worth every penny imho. I really feel it made a significant noticeable difference. This may be because my bike always was a bit rich to start off, who knows.
My jetting stock on the bike has always been a tad rich based on assumption only in stock configuration. I poured in the race fuel without any jetting changes and the bike ran awesome, although the fuel screw was turned out past 3 turns. I went one step richer on the jetting to a 48 pilot and a 162 main per the recommendation from VP. I ran the bike most of the day around 2 turns out on the fuel screw and at the end of the day went to about 1-1/2 turns out on the fuel screw. Very little to no decel popping, I probably could go a little more lean on the pilot circuit?
My concern is this, I have a tachometer/hour meter on the bike and I follow the guidelines set forth in the thumperfaq stickies on how to jet a carb, but I dont notice a big difference. I set the idle a little high around 2000 rpm's and tamper with the fuel screw without much noticeable difference in rpm's or idle smoothness. I guesstimate that the fuel screw should be out about 1-1/2 turns. Any recommendations?
Edited by motorcross242, February 12, 2013 - 09:34 AM.