I have an 036 pro that runs fine. Bought a tach to check rpm and help tune. It read 15k rpm wot, is that possible? Checked same on my 038 super and read around 12.6k rpm. It has limit tabs on carb, so I cut the tab on the high adjustment, but could only get it to back down on 14k range before I couldn’t turn the screw anymore (and it didn’t sound right). Any thoughts?