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The only thing in that link that made any sense was written by ILENGINE .
Historically a typical variable speed mower system had a shift lever for forward and reverse and that was its total function . A second lever , that typically had 7 positions , was to change travel speeds and this speed change lever was to be moved to different positions without disengaging the clutch or even touching the foot clutch in any way .
Does the mower in the original post have this set up? That's my question and I'm stickin to it . :laughing: