2018 Yamaha F70 Midrange Mechanical 20 F70LA Outboard Motor

Yamaha's 2018 F70 Midrange Mechanical, model code F70LA, tops the 1-liter midrange line at 70 hp, built with a two-piece upper case and pistons Yamaha lists as 10 percent lighter, part of a design the maker says runs up to 80 lbs lighter than competing four-strokes in its class.

Checking fitment

Remote mechanical steering means the matching control box and cable need to already be in place or budgeted for. Dry weight is 253 lbs, and this block is rated to run in either fresh or salt water.

Top end and electrical

A 16-valve, single-overhead-camshaft design with intakes Yamaha lists as 17 percent larger than earlier models pushes the operating band up to roughly 6300 rpm at full throttle, higher than the F50 and F60 that share the same block. A 17-amp alternator handles accessories and charging; trim spans -4 to +16 degrees, and tilt tops out at 65 degrees. The oil fill holds 2.1 liters with a filter or 1.9 without one.

Can diagnostics be pulled from it? Yes, an Engine Control Module interfaces with Yamaha's diagnostic software for a record of recent running conditions. What is the gear shift pattern? Forward, neutral and reverse, with electric start standard and a two-piece upper case keeping service access simple. Does it run in salt water without issue? Yes, this block is rated for both fresh and salt water use.