iboats Mercury | Mercury 200 series 20hp keikhaifer weak spark?
Weak spark on both leads or just one? That tells you a lot. Here's what I'd check, in this order:
1. Pull both plugs. The spec is NGK DCPR6E gapped at 0.9 mm (0.035 in). Fouled, worn or rounded plugs, or a wrong gap, can pass for...