MFS9.8B - Outboard motor Tohatsu - Free user manual and instructions
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| Product Type | Outboard Motor |
| Brand | Tohatsu |
| Model | MFS9.8B |
| Engine Power | 9.8 HP (7.2 kW) |
| Engine Type | 4-Stroke, Single Cylinder |
| Displacement | 210 cc (approx.) |
| Starting System | Manual (Pull Start) |
| Fuel System | Carburetor |
| Fuel Type | Unleaded Gasoline (Octane 87+) |
| Oil System | Wet Sump, Oil Capacity 0.6 L |
| Recommended Oil | SAE 10W-30 or 10W-40 |
| Cooling System | Water Cooled (Thermostat Controlled) |
| Shaft Length | Short (15 inches) / Long (20 inches) / Extra Long (25 inches) |
| Weight | Approx. 40 kg (88 lbs) |
| Dimensions (L x W x H) | Approx. 110 x 40 x 130 cm (43 x 16 x 51 in) |
| Trim Range | -4° to +20° (7 positions) |
| Tilt Range | 72° (manual tilt) |
| Propeller Options | 9-10 inch pitch (recommended) |
| Ignition System | CDI (Capacitor Discharge Ignition) |
| Steering | Tiller handle (standard) |
| Safety Features | Emergency Kill Switch, Propeller Guard |
| Maintenance | Oil change every 100 hours, Spark plug check, Impeller replacement every 2 years |
| Spare Parts Availability | Authorized Tohatsu dealers |
Frequently Asked Questions - MFS9.8B Tohatsu
How do I start the Tohatsu MFS9.8B outboard motor?
Ensure the gear shift is in neutral, attach the kill switch lanyard, open the fuel vent, squeeze the primer bulb until firm, set the choke if cold, and pull the starter rope firmly.
What type of oil should I use for the MFS9.8B?
Use SAE 10W-30 or 10W-40 4-stroke outboard oil. Do not use automotive oil with friction modifiers. Change oil every 100 hours or annually.
How do I flush the engine after use in saltwater?
Attach a garden hose to the flushing port, run the engine at idle for 5-10 minutes with the water on, then let it dry. This removes salt and debris.
What is the recommended fuel octane for the MFS9.8B?
Use unleaded gasoline with a minimum octane rating of 87 (R+M/2). Avoid ethanol blends above 10% (E10) for optimal performance.
How often should I replace the impeller?
Replace the water pump impeller every 2 years or 200 hours, whichever comes first, to prevent overheating.
What should I do if the motor doesn't start?
Check the kill switch lanyard, fuel level, primer bulb firmness, spark plug connection, and ensure the gear shift is in neutral. If still no start, inspect the spark plug and clean or replace it.
Can I use the MFS9.8B on a sailboat?
Yes, but you may need an extra-long shaft version for proper transom clearance. Ensure the motor is securely mounted.
How do I adjust the trim?
Pull the trim release lever and tilt the motor to desired position (7 settings from -4° to +20°). Adjust for optimal boat performance.
Where can I find spare parts?
Contact an authorized Tohatsu dealer or visit the Tohatsu official website. Use genuine parts for best results.
How should I store the motor for winter?
Stabilize the fuel, run the engine to circulate it, change the oil, fog the cylinders, and store upright in a dry place. Cover the motor.
User questions about MFS9.8B Tohatsu
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USER MANUAL MFS9.8B Tohatsu
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Product information
Brand : Tohatsu
Model : MFS9.8B
Category : Outboard motor