OK I see 2 potential problems, well 3 right off the bat. You said you have a 59mm kit with an A-12 cam. Due to your mods the engine requires more air and fuel and also needs to exhaust more burned fuel. 1). You will need to rejet the carb to give it more fuel, if your close to sea level and being in Arizona with low moisture you will want somewhere around a 125 jet. 2). the exhaust needs to be opened up as well but not gutted. The 3rd problem I see is the location of your air filter and the length of duct. If running sand the tire will be kicking debris up into the filter so you'll be cleaning often. You also will have restriction with that long duct with the bends. You will be better off making yourself a redneck intake and mounting the filter closer to the carb. A bunch less restriction. If you give me a call 662-301-1563 I can walk you through the processes of opening the exhaust, redneck intake and jetting. I can explain in much less time then it takes my old ars to type.
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