Yamaha Boating - Page 8 - Recent Questions, Troubleshooting & Support


You'll see 2 small caps in the carburettor cover.
Do that fogging only in very well ventilated area ( outside thus).
Run the engine on idle, open both caps, spray as much fogging oil in both holes ( use 2 cans) till the engine stalls.
Close the caps.
Done...

Yamaha... | Answered on Nov 14, 2017


Have you tried without fuel tank cap?
Seems to me as a fuel delivery problem...

Yamaha... | Answered on Nov 14, 2017


The supercharger is connected to the engine thru a clutch. I think it should slip in case the charger is stuck.
But maybe not enough to allow the electric starter to turn the engine.
Did you try to turn the engine by hand with removed spark plugs?
If the supercherger is stuck it should be possible to wiggle the kranckshaft a little ( play on the command gears and clutch of the charger)
Please give us the right Waverunner type...

Yamaha Boating | Answered on Nov 14, 2017


1. NEVER run gas with ethanol in the engine.
2. When you start it put one half can of anti fogging fluid in gas and run it for 10 minutes.
3. When you are going to store it turn the gas supply off while the engine is running and let the engine run out of gas. That way there is no varnish build up in the carb.
4 change the spark plug twice each season.

Yamaha Boating | Answered on Nov 03, 2017


Mabe you need to add a stroke or take one away.

Yamaha Boating | Answered on Oct 25, 2017


First, empty your fuel tank and pour a 2% fuel mix in it.
Remove the oil hoses coming to the carbs. Put the ends in 2 recipients.
Run the engine for a few minutes. Oil must come in the recipients. I couldn't find an exact quantity in the Service manuals.
The theoretical mix is 50:1 ( 50 liters fuel with 1 liter oil)
So, the best way is to have a full tank 50/1 fuel/oil mixture AND a full oil tank.
Sail a few hours, refuel ( count how many liter you've burned. Refill the oil tank to level.
Check that the fuel/oil ratio is about 50:1.
You can adjust the mixture with the cable on the oil pump.

Yamaha Wave... | Answered on Oct 02, 2017


Are the controls for the 'fast idle' loose? Also--run some seafoam through the fuel system on a regular basis--one per month.

Yamaha 40N/50N... | Answered on Oct 02, 2017


This can have some reasons:
1 clogged carburettors. Too less fuel means a hard start.
2 Worn spark plugs
3 Loss of compression... On a 2-stroke, measuring compression is not an exact science. Have throttle wide open. No spark plugs, check compression on all cylinders. They should be all within 1bar from eachother...

Yamaha 40N/50N... | Answered on Sep 25, 2017


It's located on the port side of the engine, You'll see just before the spark plugs the exhaust cover. At the top a cap, held with 2 10mm head bolts. There is the thermostat.
But, most of time the impeller parts will stay stuck in the tube between pump and engine block...

Yamaha 40N/50N... | Answered on Sep 25, 2017


If it's a 2-stroke, have those carbs cleaned...
Then check if he runs on all 3 cylinders.

Yamaha Boating | Answered on Sep 25, 2017


Is your battery wel loaded? If no, recharge.
If Yes, I think your startermotor is seized...
They don't have an easy access...

Yamaha Wave... | Answered on Sep 25, 2017


Low oil in tank?
Fuel gauge working?
Engine gets hot?
You should ee some information in the display...

Yamaha Wave... | Answered on Sep 25, 2017


Hey Kenneth, PLEASE take this engine to a qualified professional... it will be cheaper in the long run!!

Yamaha Boating | Answered on Sep 25, 2017


It's not possible to be 100% certain with your information but I will follow the following sequence; first take out all the spark plugs and inspect if they are too dry or with metallic residues (this could tell you about a big failure in the cooling system or lubrication and a possible mayor engine failure) , second try to run the engine with the starter, it has to run very easy without any strange metallic noise. apparently you run your waverunner without correct lubrication or water cooling circulation and the engine was over heated.

Yamaha Boating | Answered on Sep 22, 2017


You can not test any power pack. You have to test all other ignition components first. If all components test good it could be a bad powepack. First thing first, check ground wire, check all grounds. Make sure no carosen, or loose bolts. Your also want to ensure wire to terminal has a good connection.

Yamaha Boating | Answered on Sep 21, 2017

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