That can be a lot of things...
First off all, disconnect the wire plug to the remote control.
Crank the engine manually ( battery positive on the startermotor post ).
If now you have sparks, then the fault is in your remote control.
If still no sparks, you'll have trouble in the CDI, pulser coils or generator coils.
SOURCE: 2003 yamaha 115 outboard motor that dies when
I would check your fuel lines from the tank all the way to the fuel pump. It seems that you might have a pinched line somewhere. You can also bleed the fuel rail with the schrader valve on the end of the rail. If that wont fix it then you probably have a weak fuel pump.
SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor
I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.
Mark
SOURCE: yamaha 115 will not shut off with key or kill switch
not enough information on the motor. what year and model? but all yamaha outboards are shut down by the C.D.I. being grounded by the key switch or the emergency kill switch. the cheapest thing to test or replace is the key switch and the emergency kill. with more info on engine I can help you further.
SOURCE: 93" 115 H V4 Johnson outboard motor will start and idle fine
your carburetors might be dirty blocking flow to the high speed jets causing it to bog down
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