My 1991 build 40HP Lister LPWS4 engine has just been replaced by a new Canaline 42. There are two issues - I am told by the installer that, although the new engine will rev away quite happily on no load, when in gear it will not go above 1800 rpm, because the drive is over-propped. A bit puzzled, since the old engine with the same prop would happily rev way above 2000 rpm. Secondly, the accelerator cable is 'creeping back', which is said to be due to wear in my Morse control - the new engine requires the cable to pull instead of push to increase revs. Does this sound right?