I think I am having an impellor problem.<br />It doesn't seem to want to pump at slow idle,and it seems to be warm, when I'm puttin' along, but as soon as it is a moderate to strong acceleration it pumps fine...the water is warm to the touch at the tell tale.I have never taken the engine apart before,but have tinkered with everything else and am mechanically inclined....Is it a big job to change the impellor?....and ...would this infact be the problem?<br />If it's not too tough, my next question would be a point in the right direction as to where to start?<br />any help would be appreciated....I am new to this