I've had 2 of the 4231 liquid cooled units. Loved the first one at near 900 trouble free hours and nearly 400 on the 2nd unit with no engine problems and only normal maintenance. Good to know that they are better liked than the Steiner Kohler engine.
Don't forget the steiners have earned there keep,theses machines have been absolutely pounded and come back for more...and both kohler s have well over 4000 trouble free hours,I'm freshening the older one this week,first time it's had a valve cover off since new 13 yrs and 5000 hrs ago..it didnt fail it just got to where it was burning oil...pulling it past the rings which have lost there tension from overheating.