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Battery
The battery won't charge: spotting regulator and charging problems on a Yamaha
A battery that keeps going flat or an alarm at start-up often traces back to...
Read moreIntake pressure
Power loss on a Yamaha: electronics or pump?
Does the engine reach its rpm, and does the ski follow? A decision order for...
Read moreComponent test
Diagnostics for DIY mechanics and small shops: what works and what doesn't
A phone app and a dongle can read codes, show live data and test parts...
Read moreClub boats
Rental fleets and club boats: a routine that finds problems before the season
A fleet of Yamaha jet skis needs the same few checks on every boat, written...
Read moreFault codes
Why Yamaha fault code lists in forums disagree with each other
The same number can mean a different part depending on the control unit generation. Concrete...
Read moreCode 15
Three temperature sensors, one alarm: thermo sensor, thermo switch and engine temperature
An overheat alarm on a Yamaha can come from three different devices. What codes 15,...
Read moreCode 29
A MAP sensor sanity check with key on and engine off
With the key on and the engine off, intake pressure and air pressure should agree....
Read moreCorrosion
Handlebar kill switch corrosion: stalls, hard starts and false stops
The left handlebar stop switch can corrode and either kill the engine or fail to...
Read moreCode 47
The slant switch: why the engine cuts out after a flip and what code 47 means
The engine is meant to stop when the ski rolls, but it shouldn't stay dead...
Read moreFault codes
Yamaha RiDE explained: what the SCU and RPS do and where the system hangs
RiDE faults usually show up as a reverse gate that won't move. Which models have...
Read moreIdle learning
Idle and throttle relearn on a Yamaha: when it matters and when it won't help
After cleaning the throttle body or changing the battery, a Yamaha may idle badly until...
Read moreAPS
Yamaha electronic throttle explained: TPS, APS and ETV
From the VX1100 of 2005 onwards, the throttle lever and the throttle valve are no...
Read moreComponent test
Coil or injector? Individual component tests on three- and four-cylinder Yamahas
When one cylinder misbehaves, the app can test each coil and injector on its own....
Read moreData logger
Logging a test ride to catch an intermittent misfire on a Yamaha
A misfire that only appears on the water cannot be reproduced at the dock. Recording...
Read moreDiagnostics
A live-data cheat sheet: the values that matter on a Yamaha jet ski
The app can show up to 34 live values per model. Here are the ones...
Read moreClearing codes
Clearing Yamaha fault codes: when it makes sense and when it doesn't
Clearing the memory is quick and tempting. Doing it at the wrong moment removes the...
Read moreBluetooth
How to read Yamaha jet ski fault codes without a laptop
Reading Yamaha fault codes no longer needs a laptop on the dock. This is how...
Read moreBattery voltage
Same buzzer, different problems: telling overheat, oil pressure and battery apart
On some Yamahas the overheat and oil pressure warnings share one tone, and both pull...
Read moreCheck engine
The check engine light went out by itself: is the fault really gone?
The warning came on, then disappeared after a few starts. That does not tell you...
Read moreConnectors
Saltwater, connectors and corrosion on a Yamaha jet ski: early signs a scan can show
A Yamaha that sees salt water usually fails in small, unreliable ways long before anything...
Read moreBattery
Spring commissioning for a Yamaha jet ski, with a scan
A scan order for the first launch of the year: look at stored entries before...
Read moreFZR
Buying a used SVHO: timing chain, supercharger clutch and hours
Used supercharged Yamahas have three known weak spots: early supercharger clutches, the 2014/15 SVHO timing...
Read moreBuyer's guide
Buying a used Yamaha jet ski: a pre-purchase scan checklist
A fixed order for scanning a used four-stroke Yamaha at the dock: stored faults, vehicle...
Read moreECU
Dash hour meter vs. the hours stored in the control unit
The display hour meter on a Yamaha can be unreliable. The control unit keeps total...
Read moreBattery
A weak battery makes a Yamaha throw odd faults: check voltage first
Before replacing sensors on a Yamaha WaveRunner that shows changing faults, look at battery voltage...
Read moreEX
TR-1 owners keep overfilling oil: the rpm loss and oil in the air filter
Owners of TR-1 Yamahas report lost rpm and oil in the air filter after an...
Read moreCompatibility
Which Yamaha PWC models work with the M-JET Diagnostic?
The M-JET Diagnostic supports 37 four-stroke Yamaha models from 2002 on. This overview goes through...
Read more1.9 litre
Yamaha's 1.9-litre engines from 2024: what changes for diagnostics
Yamaha's 1898 cc engines from 2024 add a thermo sensor code and a long code...
Read moreFault codes
JetBlaster: what the control unit watches and where to look first
A JetBlaster from 2022 monitors close to 50 faults. This is how the codes group...
Read moreLive data
SuperJet in shallow water: sand in the intake and temperature warnings
A four-stroke SuperJet that warns about temperature after shallow-water riding usually has a water flow...
Read moreCapsize
SuperJet 4-stroke won't restart after a capsize
The four-stroke SuperJet cuts out when it rolls and sometimes refuses to start again. The...
Read moreDiagnostics
EX stalls at idle and the scan shows nothing
An EX that stalls after about 15 seconds of idle and shows no codes. What...
Read moreCheck engine light
EX Sport check engine light but no code
A check engine light on an EX Sport with an empty fault list is common....
Read moreCavitation
EX overheat beeps after a long ride: cavitation, intake or sensor?
EX owners report overheat warnings and reduced power on long rides, rarely in calm water....
Read moreBattery
VX beeps and nobody can find the reason
A beeping VX with no warning lamp and no obvious fault. What can sound the...
Read moreReverse
VX Cruiser reverse (RiDE) stopped working
Reverse that stopped working on a VX Cruiser with RiDE. Which VX models have the...
Read moreData logger
GP1800R SVHO loses power in warm water: heat soak and intake air temperature
A supercharged GP1800R SVHO that gets weaker as the day heats up may be suffering...
Read moreComponent test
GP1800R stalls when you let off the throttle
A GP1800 or GP1800R that stalls the moment you roll off the throttle needs a...
Read moreLive data
SVHO overheat alarm: thermo switch or water flow?
An overheat alarm on a supercharged 1.8 usually points at water flow before it points...
Read moreCode 159
SVHO error 159: the reverse gate, a tie-down strap and other boring causes
Code 159 on a RiDE Yamaha looks like an electronics fault, but owners mostly find...
Read moreData logger
FX SVHO limp mode after 20 minutes with no alarm
One SVHO owner describes rpm dropping after 20 to 30 minutes with no warning. The...
Read moreFZR
FZR and FZS supercharger clutch: what owners report and what a scan can show
A supercharger clutch that slips leaves a ski that runs cleanly but hangs around 5000...
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