I've got a 15hp evinrude kicker (ser. no. E15RCIS) that has no water coming out the tell tale hole. When I put the muffs on yesterday there was a little stream coming out.. but not as strong as I remember and it was rather hot. NOw today I took her out and no water was coming out. Can I use compressed air and blow back into the engine from the tell tale hole? Also what is the best way to check where the restriction is. <br /><br />I've dropped the lower unit and checked the impeller and it looked fine so I put her back together.<br /><br />Thanks