Simplicity 400 990234 vs Simplicity 404 990390

Verdict: Simplicity 400 990234 vs Simplicity 404 990390

The Simplicity 400 990234 and the Simplicity 404 990390 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 4 hp. Simplicity 400 990234 is the lighter machine (27 kg vs 107 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Simplicity 404 990390 is the newer design (1967 vs 1961). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.