the temps have gotten up above 300, but i like to keep an eye on it so its never there for long. had this problem for about 4 gallons. it does always seem to run awesome when first started, has lots of power, then once it is warmed up it starts boggin and not running good, i will try too lean out my lsn and richen my hsn, and see if that helps. there have been a few days where it ran great all day at 280, but i was always told thats too hot...