You put 1:1 oil/gas mixture into 2-stroke engines??? Holy cow, wow. My lawn mower says 30:1, another says 50:1 (gas/oil). If I put more oil, the damn thing will definitely smoke. If I put way more oil, hello to spark plug cleaning.OP, it doesn't matter if your bike is carb'd or FI in this case. Like already mentioned, turn off the petcock, disconnect fuel line, open petcock, drain that gas/oil mixture. Fill with clean gas, take the bike outside as it will smoke a lot for a little bit, and start the bike. If you really want to clean everything up (dunno why, if have tons of spare time?) then definitely remove the tank, drain it completely, flush with varsol, then gas, etc.