________________________________________________________________________________________
| Home / Outboard Engines / Tohatsu Engines / Tohatsu M3.5A2 |
Tohatsu M3.5A2 2-Stroke Specifications
The Tohatsu M3.5A2 is a two-stroke single-cylinder gasoline outboard engine. This engine has a carburetor fuel system, forced water cooling, and flywheel magneto CDI ignition system. A 4.6 cu.in (74.5 cc) outboard motor has a cylinder bore of 1.85" (47 mm), piston stroke of 1.69" (43 mm), and maximum power of 3.5 hp (2.6 kW) at 4200-5300 rpm. The boat motor is equipped with a forward-neutral gear shift, manual starting system, 3-blades aluminum standard propeller, manual trim and tilt, and tiller handle steering system. The fuel tank has a capacity of 0.35 gal (1.4 liters).
____________________________________________________________________________________
| General Technical Data |
Engine Model ................ Tohatsu M3.5A2
Engine Type ................ 2-stroke single-cylinder gasoline outboard engine
Number of Cylinders ................ 1
Displacement, cu.in (cc) ................ 4.6 (74.5)
Cylinder Bore, in (mm) ................ 1.85 (47.0)
Piston Stroke, in (mm) ................ 1.69 (43.0)
Maximum Engine Power, hp (kW) ................ 3.5 (2.6)
Maximum Engine Speed, rpm ................ 4200-5300
Trolling Speed, rpm ................ 1100
Lubrication System ................ Engine oil mixed gasoline
Exhaust System ................ Underwater exhaust
Cooling System ................ Forced water cooling
Ignition System ................ Flywheel Magneto CDI
Starting System ................ Manual
| Dimensions and Weight |
Overall Length, in (mm) ................ 21.7 (550)
Overall Width, in (mm) ................ 13.6 (345)
Overall Height (Short Shaft), in (mm) ................ 37.6 (955)
Overall Height (Long Shaft), in (mm) ................ 42.6 (1080)
Transom Height (Short Shaft), in (mm) ................ 17 (435)
Transom Height (Long Shaft), in (mm) ................ 22 (560)
Outboard Weight (Short Shaft), lbs (kg) ................ 27.5 (12.5)
Outboard Weight (Long Shaft), lbs (kg) ................ 28.6 (13.0)
| Fuel System |
Fuel System Type ................ Carburetor
Fuel Type ................ Unleaded gasoline (87 or 91 octane minimum)
Fuel Consumption, L/hr ................ 0.4
Fuel Tank Capacity, qts (L) ................ 1.47 (1.40)
| Gear Housing |
Gear Shift ................ Forward
Gear Ratio ................ 1.85:1
Gear Oil Capacity, qts (L) ................ 0.10 (0.09)
| Mid Section |
Trim System ................ Manual Trim and Tilt
Trim Position ................ 4
Transom Height (Short Shaft), in (mm) ................ 17 (435)
Transom Height (Long Shaft), in (mm) ................ 22 (560)
Steering System ................ Tiller handle
Tilt Angle (Max), deg ................ 70
| Propeller Information |
Diameter, in (mm) ................ 7.4 (188)
Pitch, in (mm) ................ 5.7 (145), 7 (177)
Number Of Blade ................ 3
Material ................ Aluminum
| Maintenance Data |
Engine Fuel Type ................ Unleaded 87 or 91 octane minimum
Engine Oil Type ................ Genuine motor oil or recommended one (TCW-III)
Engine Oil and Fuel Ratio ................ Unleaded Gasoline 50. Genuine 2-stroke Engine Oil 1
Gear Lubricant Type ................ Genuine Gear Oil or API GL5, SAE 80, SAE 90
Gearcase Capacity, qts (L) ................ 0.10 (0.09)
Ignition Timing, degrees ................ 20 BTDC
Spark Plug Type ................ NGK BP6HS-10, BPR6HS-10
Spark Plug Gap, in (mm) ................ 0.035-0.039 (0.9-1.0)
| Service Data |
Cylinder Bore Inside Diameter, in (mm) ................ 1.850-1.851 (47.00-47.01)
Piston to Cylinder Clearance, in (mm) ................ 0.0023-0.0035 (0.06-0.09)
Piston Ring End Gap, in (mm) ................ 0.007-0.013 (0.18-0.33)
Piston Ring Side Clearance, in (mm) ................ 0.0004-0.002 (0.01-0.05)
Piston to Piston Pin Clearance, in (mm) ................ 0.0002-0.0006 (0.005-0.016)
Connecting Rod Big End Side Clearance, in (mm) ................ 0.0051-0.0125 (0.13-0.32)
| Service Intervals |
Check Spark Plug ................ Every 50 hours
Check Fuel Line ................ Every 50 hours
Clean Fuel Tank ................ Every 50 hours
Check Anodes ................ Every 50 hours
Check Gear Oil ................ Every 50 hours
Check Propeller ................ Every 50 hours
Check Starter Rope ................ Every 50 hours
Check Cooling System ................ Every 100 hours
Check Water Pump ................ Every 100 hours
Check Carburetor ................ Every 100 hours
Change Gear Oil ................ Every 200 hours
Replace Spark Plug ................ Every 200 hours
| Tightening Torques |
Cylinder head bolt, Nm (lb-ft) ................ 11 (8.2)
Magneto nut, Nm (lb-ft) ................ 44 (32.5)
Stern bracket nut, Nm (lb-ft) ................ 15.5 (11.5)
Emergency stop switch, Nm (lb-ft) ................ 2.5 (1.9)
Spark plug, Nm (lb-ft) ................ 27 (20.0)
________________________________________________________________________________________
________________________________________________________________________________________
| Engines Technical Specifications |