How long will a 21" Honda HRC last under commercial mowing conditions? Two of us mowed around 110 accounts last season and the 2 Honda's seem to have lost some power since they were new. I change oil weekly and blades daily- new plugs and air filters. Does an engine lose power(compression) with use and it it just part of doing business to replace the smaller mowers every season or is there something I need to do to prolong them. I am sure that I'm like everyone- we need to be able to mow at high speed and bogging down in thick grass won't work.