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    Fuel priming Yamaha F70A

    If I run my Yamaha F70A completely out of fuel by mistake is it a case of refuelling and pumping the primer bulb to restart the engine? The motor is running fine. I don?t have any experience with the new fuel injected 4 strokes to know if there is a more involved priming procedure. I have...
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    Yamaha F70 owners.

    I am thinking of purchasing one of these motors to repower my boat. I would like to know what people thinks of the motor. Thanks TwoFish
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    R.I.P 1998 75 Force

    I?ve decided to call it quits on this motor. The cost of the parts, the gymnastics in trying to purchase the parts and having them shipped from the states. Also my lack of experience with rebuilding power heads had me a bit nervous about how the project would finish up. My wife has been trying...
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    Pistons for a 1998 75 Force

    Looks like I need a rebore and new pistons for my 1998 75 hp Force. The bore was quite worn although not damaged or grooved. It had a substantial lip at the top which is too large to remove with a hone. I’ve looked around and have found a couple of places selling Wiseco pistons. One listed the...
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    Rings to 1998 75 Force

    I have the Powerhead off my 1998 75 Force and would like your thoughts on whether it is worth fitting a new set of rings whilst motor is off. The compression is 140 even with a weak starter and bent reeds. The motor has done 220 hours. The rest of the motor is in good condition. I don't have...
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    Front engine mount 1998 75 Force

    One thing leads to another when working on older outboards. I have the power head off my 1998 75 Force sorting out some problems and I have just noticed the forward engine mount is broken (#6 in the diagram). The plates that attach to the engine and the lower cowl have detached from the central...
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    Show me you?re Torque Wrenches

    It looks like my motor is repairable (Allan key bolt thread) so the next step is getting things ready to reassemble the motor when I get it back from the engineers. My current torque wrench is a cheapy and only reads Foot/Lbs from 28 – 150. From what I can see in the manual the exhaust cover...
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    Allan key bolt 1998 75 Force

    I may need to take the powerhead off my motor this weekend. 1998 75 Force. One of the bolts has and Allan key top to it. Can I use a normal allan key to remove it or is there a special type of allan key socket tool I need to use?
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    Exhaust cover bolt 1998 75 Force

    I?m trying to remove the exhaust bolts in my 1998 75 force. Some of them have come out easily but others seem extremely corroded. The motor has been run in salt water. I have already snapped one bolt off level with the block. I have read other posts that say they have had to work at the bolts...
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    Reeds 1998 75 Force

    1998 75 Force. Still looking for the cause of the miss at idle. Removed the reeds to check their condition and noticed what looks like a small tear in the inner gasket between no.1 and no 2 reed blocks. The close-up photo shows a recessed area in the adaptor plate which looks like it would be...
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    Missing tooth on flywheel

    Is it possible to build up a broken tooth on a flywheel? Has anyone tried this? Thanks TwoFish
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    Check valves and rough idle. 1998 75 hp

    Checked the recirculation system and found two of the check valve were not closing properly. They were not blocked but just not closing fully. Cleaned them with carb cleaner but still not working. I?ve been chasing a rough idling problem for a while. I have my fingers crossed that this is the...
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    Starter pinion gear.

    I’m having starter problems and have eliminated every thing I can think of. 1988 75 p force. Voltage drop test. Cleaned starter checked brushes. New solenoid. (separate issue). Battery. The starter engages ok but does not stay engaged very long. I checked the pinion gear by placing a...
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    1998 75 hp Force Missing and rough idle.

    I’m having a problem with the motor missing. It is more noticeable when cold and is enough to stall the motor at times. At idle the motor increases revs then misses, slows down and starts the cycle over again. It seems to run ok at speed. What I’ve tried so far. Link and sync. Cleaned carb...
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    Welsh plug sealer.

    I am just about to fit a new welsh plug to the top of the carby. I noticed the old on was covered with a clear sealing compound. Does anyone know what I should be using to seal the new plug?
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    Smoke from carb?

    My engine has had a miss for a while now (more noticeable when cold) 1998 75 hp. Comp 140 all. New fuel pump and filters. Cleaned carby. Timing set to 32 static. Set at 30 degrees ststic the miss was still there. New plugs today ( seems better but I?m not convinced.). Checked for spark with a...
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    Possible clogged cooling system. 1998 75hp

    The motor is a 1998 75 hp Force. I managed to run aground Saturday night on a bar made of course grit and stone. Luckily only doing 4 knots. It took the shine off the gear case and most of the paint of the prop. The grit was quite abrasive. Pushed the boat off the bar, restarted, checked the...
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    Carb Venturi 1998 75 hp

    Just working on my carbie and wondered if the venturi is facing in the correct direction. I have look online but can not find any diagrams that show it clearly.
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    1998 75 hp mis when cold.

    I have a 1998 75hp Force that kicks or misses a couple of times quite violently when cold at the start of the day. It runs well otherwise and idles fine from then on. New plugs, done the link and sync, fuel is fresh, new hoses, fuel pump rebuilt about 18 months ago, new wiring loom...
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    End play in tilt mechanism

    I have a 1998 75 hp Force with a single ram tilt. I was checking something at the back of the boat and grabbed the skeg to help get up and it made a click sound. To cut a long story short I traced it to the pin in the top of the tilt ram that connects it to the motor. It looks OK. No corrosion...
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