I installed my FMF Q4 and Powerbomb last year without rejetting. This spring I'm going to put in the KDX snorkel so I'm also going to put in DJ 128 main. Any idea how much gas mileage I'm going to lose with the changes?

 

what year bike do you have?

 

My thought...if you lose much mileage, it's probably not jetted properly.

 

you will loose 2%.

 

ditto...when i first did the jetting, i unknowingly had it "rich"...it ran great, so didn't think anything was wrong....after putting it on the "sniffer," i realized just a touch over 2 turns on the a/f screw was enough and my gas mileage greatly improved and bike still runs strong....

 

Thanks for the replies. It's a 2012