I have a brand new, broken in 2019 Spark Trixx. It has about 34 hours on it, now. Since day 1 (late May this year) I can only get it to rev, at the most, to 7500RPM, reaching 75kmh (46.5mph). The 6 lakes I have been to thus far have ranged in elevation between 2800ft to 4000ft. It accelerates...