<span style="font-size: medium"><span style="font-family: Comic Sans MS">after a while of sitting anywhere, even in a box that "shouldn't" even collect dust, i like to take the carb and muffler off and flush them out really good with denatured alcohol, squirted through a spray bottle in a nice stream so you get a little pressure. let it evaporate for a few minutes (wearing gloves and glasses of course while using it; it's very nasty stuff if you get it in your eyes or cuts) and after everything is dry again, it will be completely de-greased and de-funked from the years. you can buy it at home improvement stores.then get you some after run oil and take out the glow plug and put a couple drops in the chamber and in the carb, and turn the motor over a few times by hand to make sure it circulates around good and coats everything. then put your glow plug back in.the stuff is like penzoil for your car. then do the same every couple of flights (especially after those not so desired "controlled" ditches), and you could probably get another 20+ years out of it. i second the fuel system replacement. i would probably do the tank too, but that's just me. i'm picky about brand and style. i use the denatured alcohol on everything i clean though. the stuff is awesome. even removes permanant marker.</span></span>