I just bought a skeeter b125 boat with evenrude 115 model number- 145693G. my question is - is this a 2 stroke or 4 stroke? what year? also I just p[ut it in the water today and it just doersn't seem to be turning enough revs at WOT. I have to move the throttle almost half way to WOT befor it even starts to accelerate. any help would be appreciated