YAMAHA 90 HP F90XB OUTBOARD MOTOR

Description

We have a new Yamaha F90XB for sale, crated and ready to ship worldwide. This is the 90 horsepower Yamaha four-stroke with the 25 inch extra-long shaft, made for boats with a taller transom. If you have a centre console, a bay boat, a deeper fibreglass hull or a workboat with a 25 inch transom, this is the 90 you want. Below you will find the specs, which boats suit it, why the shaft length matters so much, and how to order it from us.

The short version: 90 HP, 1.8 litre four-cylinder, fuel injected, 25 inch shaft, 362 pounds, mechanical remote controls, power trim and tilt. Send us a message and we will give you a delivered price.

Yamaha F90XB Specifications

Each Yamaha F90XB for sale on our site matches this spec sheet. New motor, never run, full paperwork.

Why the 25 Inch Shaft Matters

The only real difference between the F90XB and the F90LB is the shaft. The X is 25 inches, the L is 20. That five inches is not a small thing. It decides where the prop sits in the water.

If you put a 20 inch motor on a 25 inch transom, the prop sits too high. It grabs air in turns, it loses grip in a chop, and the motor over-revs while the boat goes nowhere. That is called ventilation, and it is annoying and hard on the motor. On top of that, the water intake may not get enough water at speed.

If you put a 25 inch motor on a 20 inch transom, the gearcase hangs too deep. It drags, adds spray, slows the boat and wastes fuel. You also risk hitting the bottom in shallow water.

So measure. Run a tape from the top of the transom, where the motor clamps, straight down to the bottom of the hull at the centre line. If you get close to 25 inches, the Yamaha F90XB for sale here is the right motor. If you get close to 20, look at our Yamaha F90LB page instead.

If the hull has a notch in the transom, or if the motor will go on a jack plate or bracket, the measurement can be trickier. Send us a photo with a tape in it and we will help you work it out.

Boats That Need an X Shaft 90

Here are the boats we most often see with an F90XB:

• Fibreglass centre consoles in the 17 to 20 foot range
• Bay boats built with a 25 inch transom
• Deep-V fishing boats that run in open water
• Dual consoles and runabouts with taller transoms
• Sailboat auxiliaries and some catamarans with a high mount
• Workboats and pangas where the transom was built tall for rough water
• Some pontoons with a raised motor pod

Tall transoms are common on boats built for rougher water, because a taller transom keeps following seas out of the boat. Those are also the boats where you want the prop deep enough to keep its grip in waves. That is exactly what the Yamaha F90XB for sale here is built for.

The Powerhead

Under the cowling is the same 1.8 litre four-cylinder used across the F90 range. It is a big block for a 90, which means plenty of torque at low and mid rpm. You feel it when you push the throttle down with a full boat. The motor does not need to scream to get the boat moving.

The cylinder head uses a single overhead camshaft with four valves per cylinder. That gives good breathing and a compact, simple design. Electronic fuel injection meters the fuel accurately, so the motor starts easily, idles steadily and responds cleanly when you open the throttle.

Because the engine is not stressed at cruise, it runs quietly and lasts. That is the main reason Yamaha 90s are so common on charter boats and workboats that put on a lot of hours, and why the Yamaha F90XB for sale here is a motor you can plan around.

Running in Open Water

Open water is where an X shaft motor earns its keep. In a chop, the boat pitches up and down. With a short shaft on a tall transom, the prop would keep coming close to the surface and losing grip. With the right 25 inch shaft, the prop stays down in solid water where it can push.

On the Yamaha F90XB for sale, that means steady thrust in rough conditions, better control in following seas and less of that heart-in-mouth feeling when the prop lets go. Combine that with power trim, and you can keep the bow down into a head sea or let it rise in flat water for better speed.

Owners who move from a wrongly matched motor to the right shaft length often say the boat feels completely different. The motor was never the problem. The setup was.

Weight and Balance

At 362 pounds, the F90XB is a few pounds heavier than the L version because of the longer midsection. It is still light for a four-stroke 90. Most boats with a 25 inch transom are built to carry this kind of weight easily.

If you are replacing an older two-stroke, the four-stroke may weigh a little more. Look at how the boat sits at rest. If the stern is low, moving a battery or some gear forward usually fixes it. If you are replacing an older Yamaha four-stroke 90, the Yamaha F90XB for sale here should be very close in weight and fit.

Fuel Use

The F90 is a thrifty motor. Fuel injection, good combustion and a big, relaxed block all help. At a steady cruise, it burns much less than an old carbureted motor of the same power.

I will not give you a number, because every hull and load is different. The best advice is to find your boat’s sweet spot, usually somewhere in the middle of the rpm range where the hull runs flat, and cruise there. Trim the motor out until the boat is running cleanly. Keep the hull clean. Those habits make a real difference to your fuel bill on the Yamaha F90XB for sale.

Electrics and Charging

The alternator on the F90XB puts out up to 35 amps. For a typical centre console or bay boat with a chartplotter, a fish finder, a VHF, nav lights, a bilge pump and a livewell, that is enough. If you add a lot of extras, think about a second battery and a switch or a charging relay so your starting battery is always ready.

With a compatible Yamaha digital gauge, the F90 supports variable trolling rpm. You can set the trolling speed in small steps without touching the throttle. Great for trolling baits and for slow, steady running through no-wake areas. Ask for it when you rig the Yamaha F90XB for sale.

Prop Selection

Getting the prop right lets the motor reach its full throttle range of 5,000 to 6,000 rpm with your normal load. If the motor will not reach the range, the pitch is too high. If it over-revs, the pitch is too low. Each inch of pitch moves the rpm by roughly 150 to 200, so you do not need big jumps.

For centre consoles and bay boats, stainless props are popular. They hold their shape, bite better in turns and often add a bit of speed. Four-blade props can help a heavier boat get on plane and hold better in rough water. Aluminium props are a sensible choice for workboats and for running in areas where you might hit something.

Yamaha’s propeller guide is a good starting point. We are also happy to suggest a prop and ship it with your Yamaha F90XB for sale order.

Rigging the F90XB

The B version uses mechanical controls, so rigging is simple and affordable. You will need:

• A Yamaha mechanical control box
• Throttle and shift cables of the right length
• A main harness and key switch
• A gauge, analogue or Yamaha digital
• Steering, usually hydraulic on boats of this size
• A fuel line, primer bulb and water-separating filter
• A marine starting battery

If you are replacing an older Yamaha with mechanical controls, some of this may be reused. If you are coming from another brand or from digital controls, plan for new parts. We can quote those with the motor.

We recommend a Yamaha dealer or qualified marine mechanic for the install. They will set the mounting height, adjust the cables, bleed the steering and test the motor on the water. It is worth it, and every Yamaha F90XB for sale we ship comes with the manual your installer needs.

Mounting Height on a Tall Transom

Even with the right shaft length, the exact mounting height needs some fine tuning. A good starting point is to set the anti-ventilation plate roughly level with the bottom of the hull. From there, a mechanic can raise the motor a hole at a time while testing speed and handling. Higher usually means less drag and more speed, up to the point where the prop starts to ventilate in turns. Find that point and drop back one hole.

If you use a jack plate, you can adjust height on the fly. That is useful on bay boats that run in shallow flats one day and open water the next.

Break-in and First Service

The break-in is ten hours. Start gently, vary the speed, and avoid long periods at full throttle. The owner’s manual lists each stage. After the break-in, change the oil, filter and gear lube. That first oil change is important, because it takes out the fine metal particles from new parts bedding in.

Maintenance

• Flush with fresh water after every trip, especially in salt.
• Check the tell-tale every time you start.
• Change oil and filter at the hours in the manual or once a season.
• Change gear lube each season and check it for water.
• Replace the water pump impeller on schedule.
• Check and replace anodes often.
• Change fuel filters and use stabiliser if the boat sits.
• Grease fittings, steering and the tilt tube.

Stick to that and the Yamaha F90XB for sale here will give you many years of service.

Salt Water Care

A lot of X shaft motors end up on saltwater boats, so this matters. Yamaha builds the F90 with a corrosion-resistant aluminium alloy, a multi-layer paint system and sacrificial anodes. Still, salt is relentless. Flush every time. Rinse the outside, especially around the bracket and the gearcase. Tilt the motor up when moored so the lower unit is not sitting in salt water. Spray electrical connections with a corrosion inhibitor now and then. Touch up paint chips before they turn into corrosion spots.

F90XB vs Other Options

F90XB vs F90LB. Same motor, different shaft. Pick by transom height.

F90XB vs VF90XA V MAX SHO. The V MAX SHO 90 X shaft is tuned for performance and speed. Good on light, fast boats. For an all-round centre console or bay boat, the standard F90XB is the better value.

F90XB vs F150. If your boat is rated much higher and you carry a lot of weight, a bigger motor like the Yamaha F150 might suit you. But it is heavier and costs more to buy and run.

For most boats with a 25 inch transom and a 90 HP rating, the Yamaha F90XB for sale here is the sensible pick.

How to Order

1. Send us a message through the contact page.
2. Tell us the model, how many, and your country and city.
3. Add any props, controls or parts you want.
4. We send a delivered price.
5. You confirm and pay.
6. We ship with FedEx, UPS or USPS and send you tracking.

Read our refund and return policy and terms and conditions if you want to see them before you order.

Shipping Worldwide

We ship to buyers in North and South America, the Caribbean, Europe, Africa, the Middle East, Asia, Australia and the Pacific. The motor travels in its factory crate. Import duties and taxes depend on your country, so it is smart to check with your customs office before the motor arrives.

When it lands, check the crate before signing. If there is visible damage, take photos and note it on the receipt. Keep the paperwork safe for your local Yamaha dealer to register the motor. Warranty terms depend on the country of registration, so ask your dealer what applies to you.

Who Buys the F90XB

We sell the Yamaha F90XB for sale to private owners, charter skippers, fishing guides, dive shops, small ferry and water taxi operators, and dealers. Fleet buyers like keeping every boat on the same model so one set of spares covers them all. If you need several, tell us the number and we will quote them together.

See what other buyers say on our reviews page and read more about us.

More Yamaha Outboards

Browse the 90 HP Yamaha range, the full Yamaha outboards section, the newer Yamaha models or the whole shop. Our blog has tips on buying and looking after outboards. For more on the F90 family, see Yamaha’s official site.

A Closer Look at Who Should Buy This Motor

We talk to a lot of people before they buy, and the ones who end up with an F90XB tend to fall into a few groups. See if one sounds like you.

The coastal angler. You have an 18 or 19 foot centre console. You run out of an inlet, sometimes in a sloppy sea, and fish reefs or wrecks a few miles out. The boat was built with a 25 inch transom for exactly that kind of water. You want a motor that starts every morning, sips fuel on the long run out and holds its grip when the sea gets up. The Yamaha F90XB for sale here is a natural fit.

The bay boat owner. You fish flats and channels. Some days are calm and shallow, other days you cross open water to get home. A jack plate lets you raise the motor in skinny water and drop it for open water. The F90XB gives you the length you need for the deep runs, and the light weight helps the boat float shallow.

The working skipper. You run a panga, a water taxi or a small dive boat. The motor works every day, sometimes all day. You need something simple that local mechanics can fix, with parts you can find. Mechanical controls, a proven block and Yamaha’s parts network make the Yamaha F90XB for sale here an easy choice for work.

The family boater. You have a dual console or a runabout with a tall transom. You cruise, tow a tube and take the family to the beach. You want quiet, smooth running and no fuss. The Yamaha F90XB for sale does that well.

If none of those sound like you, that is fine. Send us your boat details and we will tell you honestly if the F90XB is the right motor.

Repowering From an Older Motor

A lot of buyers are replacing an older motor on a boat they already love. A few tips make that go smoothly.

First, check the transom. Look for soft spots or cracks around the old bolt holes. If the transom is sound, you are good to go. If not, get it repaired before you hang a new motor.

Second, look at the fuel system. Old tanks can hold water and gunk that a fuel-injected motor will not like. Replace old hoses and fit a good water-separating filter. If the tank is old and suspect, think about replacing it too.

Third, check the steering. Old cable steering can be stiff and worn. Hydraulic steering makes a 90 much easier to drive and is worth it on most boats in this size range.

Fourth, think about gauges. A Yamaha digital gauge gives you rpm, trim, hours and warnings, and it supports variable trolling rpm. It is a good upgrade to make at the same time as the motor.

Do all of that, and the boat will feel almost new. We can quote any of the parts with your Yamaha F90XB for sale so they arrive together.

Spare Parts Worth Keeping

If you live somewhere far from a Yamaha dealer, keep a small kit of spares. A spare prop and nut kit, engine oil and a filter, gear lube, an impeller kit, spark plugs, fuel filter elements, anodes and a few fuses. That covers most of what you will need in the first couple of seasons. Many overseas customers add a kit like this to their order for the Yamaha F90XB for sale, and it saves a lot of waiting later.

Frequently Asked Questions

Is the Yamaha F90XB new?

Yes. Every Yamaha F90XB for sale on our site is brand new, in the factory crate.

What is the shaft length?

The Yamaha F90XB for sale here has a 25 inch X shaft.

How much does it weigh?

The Yamaha F90XB for sale here weighs 362 lb, or 164 kg.

Does it use mechanical or digital controls?

The Yamaha F90XB for sale here uses mechanical remote controls.

Can I use it on a 20 inch transom?

No. For a 20 inch transom you need the F90LB.

Do you ship to my country?

We ship worldwide with FedEx, UPS and USPS. Send us your location for a delivered price.

Can you add a prop and controls?

Yes. Ask and we will include them in the quote.

Get Your Delivered Price

If your boat has a 25 inch transom and a 90 HP rating, the Yamaha F90XB for sale here is a great fit. Send us your country and the number of motors, and we will reply with a delivered price. Confirm, and the motor gets crated and shipped to you with tracking.