Slavens Racing gave our fresh KTM 300 a head and cylinder mod as well as a thoroughly tested Mountain Jetting Kit, designed for riding about 8,000 feet of elevation. We know how gutless a motorcycle can seem when the air gets thin. All of the bikes were affected by the lack of air when we reached 14,000 feet, but those of us with the Mountain jetting kit were a little better off. The motor wasn’t as slow to rev and kept more of a predictable off-idle delivery. And for the motor modifications, power was boosted in a broad range. From low-end torque to mid-range pickup, our 300 just had more power.