MFS90A - Outboard motor Tohatsu - Free user manual and instructions
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| Product Type | Outboard Motor |
| Brand | Tohatsu |
| Model | MFS90A |
| Engine Type | 4-stroke, 4-cylinder, DOHC |
| Displacement | 1,498 cc |
| Maximum Output | 90 HP at 5,500-6,000 rpm |
| Full Throttle Range | 5,000 - 6,000 rpm |
| Fuel System | Electronic Fuel Injection (EFI) |
| Starting System | Electric Start |
| Steering | Remote Control (standard) / Tiller (optional) |
| Gear Ratio | 2.15:1 |
| Weight | Approx. 160 kg (353 lbs) |
| Transom Height | L: 508 mm (20 in) / X: 635 mm (25 in) |
| Fuel Tank Capacity (Optional) | 25 L or external tank |
| Oil System | Wet sump with oil filter |
| Cooling System | Water-cooled with thermostat |
| Ignition System | CDI (Capacitor Discharge Ignition) |
| Trim & Tilt | Power trim and tilt |
| Alternator Output | 12V - 30A |
| Warranty | 3 years limited |
Frequently Asked Questions - MFS90A Tohatsu
What type of oil should I use for the Tohatsu MFS90A?
Use a high-quality 4-stroke outboard oil meeting NMMA FC-W or API SJ/CF standards. Recommended viscosity is SAE 10W-30 or SAE 10W-40 depending on temperature.
How often should I change the engine oil?
Change the engine oil after the first 20 hours, then every 100 hours or annually, whichever comes first. Also replace the oil filter with each oil change.
What is the recommended fuel?
Use unleaded gasoline with a minimum octane rating of 87 (R+M)/2. Do not use fuel containing more than 10% ethanol (E10).
How do I winterize my Tohatsu MFS90A?
Flush engine with fresh water, stabilize fuel, change oil and filter, fog cylinders with fogging oil, grease fittings, and store upright in a dry place. See manual for full winterization procedure.
What is the break-in procedure?
For the first 10 hours, vary engine speed, avoid prolonged idling or full throttle. Do not exceed 4000 rpm for first 2 hours, then gradually increase. Use rich oil mixture if specified.
What spark plugs do I need?
Use NGK DCPR6E or equivalent. Gap should be 0.8-0.9 mm (0.031-0.035 in). Replace every 100 hours or as needed.
How do I check the gear oil?
Remove the vent screw (upper) and drain screw (lower). Oil level should be just below the vent hole. Use SAE 90 GL-5 gear oil. Replace annually.
What is the correct propeller size?
Propeller size depends on boat weight and use. Common sizes for MFS90A are 13.5x17 or 14x19 pitch. Consult manual or dealer for optimal propeller choice.
How do I replace the water pump impeller?
Lower the gearcase, remove the water pump housing, replace the impeller, and reassemble. Lubricate with glycerin or soapy water. Do not use oil. Replace every 300 hours or annually.
Where can I find the serial number?
The serial number is located on the transom bracket or on the cowling. Record it for parts and service inquiries.
User questions about MFS90A Tohatsu
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USER MANUAL MFS90A Tohatsu
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Product information
Brand : Tohatsu
Model : MFS90A
Category : Outboard motor