Another thing is that there is no adjustment to make the engine idle at 1800 rpm, normal cold idle is 1300 - 1400 rpm and drops off from there as the engine warms up. If the engine is already warmed up and the engine is restarted it goes into cold idle mode briefly untill the ECM recieves the ETS signal then drops to warm idle mode 1000 - 1050 rpm.
So ... the 1800 rpm thing means there's something else wrong, maybe throttle cables or a faulty TPS. Digital Tech diagnostics time.
Southern CA and OP is 75 - 100 miles from a H-D dealer ? Hell I thought there were H-D dealers every 5 miles out there !!!
Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .