I drilled the hole on throttle side of tank (the right side if your sitting on bike) on the flat portion next to fuel pump had to cut a little insulation to make room for tank bung, you have to remove fuel pump to put half of tank bung inside fuel tank and the other half screws on to it from outside of tank a little hard to get bung inside of tank just takes a little time, dont worry about fumes because tank will be emty anyway drilled mine with no problems