I have a John deere 777 with the 27hp liq cooled kawasaki engine. When I get into thicker stuff and mainly when I'm bagging I notice a lot that it doesn't quit have as much torque to get through the heavy stuff as it did when it was brand new. it has just at 1700 hours on it now and was wondering what to do. I've never heald on to a mower this long and everything else works great and is in good order was wondering if these engines are rebuild-able and reliable their after. Or if I should just get a new engine for it the mower itself has at least another 1000+ hours left on it. Any suggestions or ideas on what to do or where to look for a reasonably prices engine would be great thanks.