Usually popping in the exhaust is unburnt hydrocarbons ffromt a lean condition. You could spray ether from the end of one of those little red tubes, to pin point an air leak, barring none, see if you can lift the needle one notch. Not all carbs have the notches for doing that.
A forum community dedicated to Kawasaki Motorcycle owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, off-road, touring, street bikes, and more!