Fellow LB addict here

[Joe Kuhn]

...I have heard that the DuraForces don't last as long as F-engine LawnBoys due to them having sleeve bearings instead of the F-engine's ball bearings. ?‍ I know F-Engine Lawn-Boys seem to last forever.

Interesting comment about the bearings. We checked for slop and what we found was explained away by my son as the piston going past the port holes thereby creating a jumpiness. I thought it was bearing wear. We'll see.