Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 12Get this manual
General Specifications Full Throttle RPM Range Idle RPM Range in Forward Gear
5000-5500 600-750
74 V-Type, Cyl inder, 2-Cycle
Engine Type
CuInDisplacement Cylinder Bore Stroke
207 (3393 G.G 3.74" (95mm) 314" (80mm1-2-3-4-5-6
Thunderbolt Breakerless Capaci tor Discharge NGK-BUBH or Champion L6VC or Champion L-76V (Resistor Spark Plug) 25" Shaft575 30" Shaft590
Firing Order
Ignition Type
Spark Plug
Engine Weig ht Reed Stop Open ing
.130" (3.3mm) Refer to Powerhead, Section for Measuring .012" 10 .024(.30mm.61 mm )