I nabbed a "demo unit" Redmax HEZ2500S stick edger off of Craigslist, mainly as a backup unit. The guy selling isn't close to me in the state so he shipped it to me, but promised it ran like a top. Well, that's half right I guess....it runs at full throttle great, but the second you let off, it dies. No low idle, it just comes down from wide open to dead. And, being a Redmax the carb has no adjustments other than idle (which even maxed out does nothing to change the behavior). Assume here we're talking about a new engine...it looks showroom great, other than some dust. Filter is clean, gas is 89octane, Stihl Ultra mix (same stuff that runs great in my other trimmers), screen is new, fuel line is clean and no clogs or kinks, fuel filter is new, spark plug is perfect. What say the experts? Carb problem? I have a local Redmax dealer in case all else fails, but I'm willing to tear into it...never owned a Redmax motor, are the carbs adjustable at all or not? Speaking of which, does anyone know of an online dealer that stocks parts?