My yamaha 1100 waverunner will not turn on . I have a ew battery in it, but no power. They have set out side for the past 4 years. What do I need to check?

Call Yamaha and tell them the serial number.

they dont do a 4stroke 1100 high output ! 1800HO then 1800SHO !

strip the carbs !!!!

Follow the wire back from the starter. It should bring you to the relay. Many starter relays have 3 wire going to them. Usually, 1 smaller wire, and 2 larger wires. One wire will be power from the battery. The smaller wire will have power when the key is turned to start. The third wire will carry the battery voltage to the starter during starting. good luck

Would be the starter solenoid or relay. Try Yamaha parts or Amazon.

Have you done a compression test on all cylinders? My guess is you have a dead cylinder (no oil to one or more cylinders causing loss of power). If the compression test passes (all cylinders equal and higher than 100-110 psi) you have a restricted exhaust from a failed catalytic converter that has broken apart.

http://www.boats.net/parts/search/Yamaha/WaveRunner/1996/RA1100U%20WAVE%20RAIDER%201100/parts.html

I have a Yamaha fx 1100 that starts real slowly the battery is fully charged but the bike sounds like its not got alot of power going to the starter can anyone help solve this also battery terminals are clean and not corroded

Try jumping the waverunner using a set of jumper cables and your vehicle, this will rule out if the battery is bad. If you still have the same issue, check the connections. The connection at the starter or another place may have corroded a bit. Yet another option is to remove your spark plugs to make sure that your motor has not hydraulically locked. Once you have removed the plugs try and turn over the engine. You may need to ground out your plug wires if you have an electronic ignition to protect it. I hope this helps.

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