Originally Posted by Integra

how bad is it.....a buddy ran his MR.21 for a good 5-8 min with no filter and then processed to try and start the damn thing for another 5 min even trying a new plug before realizing his mistake.(better yet i came and inquired what he was doing) and saw no filter through the side window....turned out that motor ran another 3-4 solid gallon's and got put away in a running condition....the amount of pebbles and rocks i pulled from the case was a sign it would never live again....well...i was sure wrong.