would be easier for us to help if you give a little more info.... is this a brand new truck or was it running good before? etc etc someone will be here to help I'm sure and welcome to the forum!!! i don't have alot of knowledge with the mach engines but I'm sure someone here will!!!
i tried to find specs with no luck maybe you could get the manual and find out where the site for your engine is they should have the info,email customer support there,good luck
I have the Dynamite Mach .26, is this the same mill? If so, the the stock settings are 3.5 turns out on the High speed needle and 2 turns out on the Low speed needle. The webpage is www.horizonhobby.com and you can dowload the instructions manual from there. As far as an answer to you question the guys are right, alittle more info is needed.