I have been having this issue starting my KTM 450 XCF. No matter if it is cold or warm I cannot start the bike unless I give it the slightest throttle twist. I can sit there and cycle the starter all day long but it will not start unless I give it a little bit of gas. If I twist the throttle too much it will make a pop sound and stop turning over and so I have to release the button and try again. Once the bike is running it runs great. Also I have a new (ish) lithium battery that runs strong so I don't think it is a battery issue. I am wondering if the TPS needs to be adjusted slightly? Maybe more voltage? My bike has a full aftermarket exhaust and a higher compression piston. Not sure if that would affect it. I also am running a fuel tuner because of the previous mentioned mods making it run too lean (which in hindsight I should have just left the bike alone). Any thoughts?