20 Most Recent Yamaha 12V Air Pump Questions & Answers

For a 2001 Yamaha F115 4 stroke use NGK Plugs LFR6A-11 gapped between 0.039 and 0.043

you have fouled spark plugs change them all fixed all the newq yamaha sare doing it it is the in thing to do

You must try to crank it by hand ,remove spark plugs so there will be little compression and then try to turn the motor it should turn without to much force this will indicate the motor has not seized when hooking up a jump start do not connect both leads directly to the battery ! the red + lead should connect to the red+ on both batteries but the neg lead - should not go to the battery post but to a ground usually directly to the metal engine cover or you can damage the battery !

indicates that a component in the ignition circuit is overheating internally and failing could be a coil or cdi unit or any sensors if fitted

check hull type as a freshwater hull and a sea hull are different as sea water has a higher level of buoncy .Although i doubt if you will encounter a freshwater hull but it is a thing to think about and check.Main cause though could be lack of engine power for whater reason .

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Sounds like you have a bad stator. It may be producing enough spark to start the motor, but under a load (as in the water) it simply can not supply the amount of spark needed. Sometimes when a stator is tested on a ohms meter it may test good, but still be defective do to the load it will come in contact with when put in the water.

does this happen repeatedly or just sometimes? check the one way vale and the line its attached too on top of the fuel tank then make sure theres no water in the fuel filter, if there is water in the filter it should be visible and kind of look like a bottle of salad dressing or oil and vinegar before its been shaking up.

I have one as well. Same problem and it got worse until I had to prime the carb to run. Fix is simple. 2 carb kits off eBay. Approx $30 ea new. Takes about 2.5 hours to do. I have never done before so I thought it was easy. What happens is the carbs have rubber diaphragms in them that act as a fuel pump. My old ones were really thin and worn. The new ones thicker and better. Put it back together and viola. It starts on it's own. I checked all forums about shut offs and external primers, pop pressure etc. Just rebuild your carbs. You'll be fine.

Which check valve are u referring to? On the metering plate under the main diaphragm or the fuel pump side? The metering plate valve is held in with a plate and single screw the other side is held in with rubber grommets.

As bad as this sounds its the only way. Grab yourself a 2x4 and a nice size prybar.Lay 2x4 across the back grab handle as to not damage it then put prybar directly under seat latch and pop it up.

Counter clockwise, it has normal right handed threads. The only part with left handed threads is the pump/impeller shaft.

I have a 1998 Exciter with the same problem and the engine was replaced last year. Any answers yet?
Tom