yep it unscrews the sameway of the engines rotation(to remove)! its usually EZ to remove if it isnt corroded on. to remove it easily, remove the sparkplug and slip a peice of rope down into the cyclindar with enough rope to block the piston from rotating. then remove the outter houseing from the pump (4 bolts-and use anti-seize compound when replaceing the bolts) now if you have a strap wrench ,wrap the strap around the impellor and turn the impellor the sameway the engine rotates(to remove).DO NOT USE ANY STRIKING TOOL TO HIT THE IMPELLOR! hopefully itll pop free and unscrew!if not, id squirt some Kroil oil or some type of anti-rust spray and let it sit for awhile and try it again.while your at it, it may be a good time to check or replace your pump seal! DONT FORGET to use the anti-seize compound on the bolts and maybe a good idea to use some high temp anti-seize compound on the spark plug as well!
