ORIGINAL: gaRCfield
I thought the crank cases were aluminum, but I've got some brown stuff 'growing' on the outside of my crank case: on the top around the glow plug and cooling fins, and on surface where the muffler bolts on (and on the muffler too). Or is this just dirt and stuff that got cooked on there?
I don't want my baby to rust!!!
As others have noted, it's the residue left from the glow fuel after burning.
I used Dawn Power Dissolver to remove it from a muffler and posted my results here: [link=http://www.rcuniverse.com/forum/fb.asp?m=5929584]Removing Glow Fuel Residue[/link]