Canzures, I hope it is ok with you that I piggyback on your thread instead of starting a new one. Thanks in advance.

I have the same exact problem with my Ultra LX Comp! Just now into the 5th tank and the most it will stay running is 3-5 minutes. Can easily get it restarted but again, it will only run for about 3-5 minutes. Factory glow plug is still in, for the time that it does run, I am seeing anywhere from 220-225* with a good amount of smoke from the exhaust. I noticed you guys mentioned changing the plug, would an OS A3 work ok? I have a few extras of those laying around that I have as spares for my Tornado (they are brand new) or should I use a medium plug? I have been reading the forums about the Ultra LX and seems a lot of members say the A3 may be too hot of a plug for it. Can you all tell me what kind of plug comes with it from the factory.

Thanks for any help you all can give this newbie.