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I ran 20% with a medium, I think. It's been a couple of years since I've used that engine for anything, I just keep it as a spare on race days, using Dynamite .19 in both of my TMaxx's.

My TRX 2.5 engine (which sits on a shelf these days) was notoriously hot. I richened it to get it down around 240-250, but when at optimal performance it was hitting 270 routinely, and definitely too hot. Some people told me to change the carb, I just wound up switching engines.