I built a onboard glow system that is in mine that was installed from day one. This was my first 4-stroke (now have 3) and I just did it to avoid any problems. I talk to all kinds of people that have them inverted without onboard glow that have no problems. I know I get a good low idle out of mine. I would say try it without and run a OS F glow plug and if you can tune it right you probably won't have any problems. I am also running Wildcat 15% (18% oil) all synthetic 2 or 4 cycle fuel. Being all synthetic is burns a little hotter and the four strokes love it. Run it in all my two strokes too. They say not to use it in any ringed 2 stroked though. I guess they wear a little quicker without the castor.