Problem is , seems like every two years I have to have it in the shop because engine will stop running while mowing. If i'm fast enough to disengage then reengage the saftey bar before engine completely stops it will rev up and continue to run. By end of mowing season the duration between occurances gets shorter untill mower will not start at all. Can't remember what they replace at the shop. Does anybody else have this problem? Would like to do the repairs myself if possible.