Quadman8....I have used hr meters for a few yrs to really gauge ride time.  On my standard Hall dune port I'm able to freshen up with rings at 25-30 hrs...it will need a piston around 50 hrs. The top will be caving in and there probably will be cracks starting on the intake side.   This might give an idea of the maintenance and cost side of one brand of motor, but doesn't help much trying to compare performance to what you have now.
  Next trip out I'll watch hrs and tanks of fuel used.