I'm running one of Brian's modded .25 6port's and haven't had any trouble with the the stock carb.When I was breaking it in I noticed the needles were very sensetive to small changes.It seemed like the HSN was set too lean for breakin and the low speed needle was too rich.I couldn't even get the glow ignitor off the glowplug without it stalling.I switched to an OS LC3 with 2 copper washers and the thing never stalled after that.I would suggest not even trying to run it with the stock #5 plug until breaks in.The only thing I done was sealed the metal to plastic joint on the carb and the pinch bolt.I ran it at the Pro series race at JCP this past weekend and made 8 minutes on fuel with a 7mm restrictor in my Xray.Here's a pic of the carb and an extra shot of my truck.