if engines are allowed in this discussion then i nominate the cen - nx26. my first buggy was an rtr cen matrix with this paperweight driving it along. it was horrible, i thought it had a nice tune until like 1 month after getting it it went ca-poop and seized, for no reason [&:] wasn't lean or anything. i (being a noob) got the pliers out and cranked it over with the flywheel, and started to run it again
. then it eventually died and was replaced with a go. engine. OK so you may be thinking user error? i bumped into the cen Ireland rep at the grp Irish challenge and he got the engine replaced for free just cause it was a free engine.. so i tried to break it in a couple of months ago (it had no pinch..) and as it started the temperature rocketed to 280 degrees in seconds, and that was running super rich break in settings. i thought i had an air leak so checked and sealed the whole engine and tried again..same thing [:@]. so far the engine has two tanks through it ha ha.