Yamaha F150

Continuous use — at every fill-up and after every outing

• Add Yamalube Ring Free PLUS fuel additive at every fill-up
• Treat every tank with Yamalube Fuel Stabilizer & Conditioner PLUS
• Flush the cooling system after each use, especially in salt or brackish water
• Check the power trim and tilt fluid level, and top up with Yamalube Performance Power Trim & Tilt Fluid if the system will not hold a tilt
• Apply Yamalube Yamashield corrosion-protection spray
• Before going out, inspect the outside of the lower unit for damage and clear any fishing line or debris from the propeller shaft
• During wash-down, brush growth off the anodes — an anode covered by growth, paint or coating cannot do its job

After the first 20 hours — new-outboard break-in service

• Change the engine oil and replace the oil filter
• Replace the lower-unit (gearcase) lubricant, fitting new crush washers to the drain and vent screws
• Replace the external 10-micron fuel/water separating filter
• Replace the primary on-engine fuel filter element

Every 50 hours

• Replace the external 10-micron fuel/water separating filter — or sooner if you take on a bad tank of fuel

Every 100 hours or annually, whichever comes first

• Change the engine oil and replace the oil filter
• Replace the lower-unit (gearcase) lubricant — the drain and vent screw crush washers are single-use and must be renewed every time
• Replace the primary on-engine fuel filter element
• Pull the spark plugs and check them for colour and wear — they should be light brown with relatively sharp edges — and replace as necessary
• Check the magnetic gearcase drain screw while the lubricant drains: fine metallic dust is normal, but larger chips mean a dealer should look for internal damage

Every year — water pump inspection

• Inspect the impeller and water pump assembly, whether the engine runs in salt, brackish, turbid or fresh water
• Replace the impeller or the whole water pump assembly rather than attempting a repair, and never turn the crankshaft or drive shaft counter-clockwise while the pump is apart

Every 300 hours — authorised Yamaha dealer

• Have an authorised Yamaha Marine dealer replace the Vapor Separator Tank (VST) filter

Every 1000 hours or five years, whichever comes first

• Replace the timing belt

Dealer-performed checks — interval per your engine's owner's manual

• Have an authorised Yamaha Marine dealer check the valve clearance
• Have an authorised Yamaha Marine dealer inspect the timing belt

On condition — anodes

• Replace the anodes when they are about half gone — this is owner-serviceable on most models
• Never paint or coat an anode, and brush growth off it at each wash-down: a covered anode cannot protect the engine

Before winter storage or lay-up

• Change the engine oil and replace the oil filter
• Replace the lower-unit (gearcase) lubricant
• Replace the external 10-micron fuel/water separating filter and the primary on-engine fuel filter element
• Treat the fuel with Yamalube Ring Free PLUS and Yamalube Fuel Stabilizer & Conditioner PLUS
• Fog the engine with Yamalube EFI Engine Storage Fogging Oil
• Flush the cooling system and apply Yamalube Yamashield

The F150 is two different engines, and the model code tells you which

Yamaha sells the F150 as a 2.7-litre engine with mechanical controls and a 2.8-litre engine with Digital Electronic Control, and they differ in ways that matter when you order parts: bore, compression ratio, alternator output, recommended octane and stated oil capacity all change between them. On Yamaha's current price list the mechanical models carry codes like F150LD and F150XD, the DEC models F150XSA, and the tiller F150XHA; an LF prefix means the counter-rotating version. Read the code off the clamp-bracket label before you buy anything, because a page that quotes one figure for “the F150” is quoting one of two engines.

A dot in Yamaha's chart is not a service interval

Yamaha's four-stroke replacement chart marks engine oil, gearcase lube, the on-engine fuel filter, spark plugs and the impeller with a filled circle in the 100-hour column, not a tick. The legend defines that circle as “refer to your Owner's Manual or consult your dealer for the specific requirements of your engine”. Read as a tick, it turns an annual impeller inspection into a 100-hour impeller replacement and invents work nobody asked for. The intervals on this page come from the pages where Yamaha states them in words instead.

The cheapest filter has the shortest interval, and it is easy to miss

The external 10-micron fuel/water separating filter is on a 50-hour clock, twice as often as anything else on the engine, and Yamaha says to change it immediately after a bad tank of fuel regardless of hours. There is a second filter on the powerhead on a 100-hour clock, and a third inside the vapour separator tank that a dealer changes at 300 hours. Owners who service the engine-mounted filter and forget the one in the fuel line get water and debris arriving at a filter that was never meant to be the first line of defence.

Two jobs on this engine are dealer work, and one of them has a real deadline

Yamaha names valve clearance and timing-belt inspection as procedures to leave to an authorised dealer, and recommends replacing the timing belt every five years or 1000 hours. The five-year half of that is what catches people out: a lightly used boat can reach it at a few hundred hours, so the calendar arrives long before the hour meter does. Yamaha does not publish a valve-clearance interval on its public pages, so that one comes out of the manual for your serial number.

Yamaha's own maintenance hub. The replacement-schedule chart here uses ● to mean “refer to your Owner's Manual or consult your dealer” — it is not the same as a tick, and several 100-hour rows carry it.

Yamaha's own bulletin for the three second-generation 100-hour kits: what each kit contains and the exact model codes it fits. It is also where Yamaha states the cadence in its own words — every 100 hours or each year, whichever comes first.

The bulletin for the four earlier 100-hour kits, which cover model codes the second-generation kits do not. Worth reading if your clamp-bracket code is missing from the April 2026 list: the first-generation kits hold a different set of parts — impeller, thermostat, anode, trim tab and plugs rather than the oil filter and drain-plug gaskets.

Yamaha serves the manual against your engine's Primary ID (model code, shaft length and serial number), which is on the label on the clamp bracket. Intervals Yamaha does not publish publicly — valve clearance is the one that matters here — are in that manual.