I have a pair of E-Tec Saltater series BRP 150's that are really hard to start. It's as if the plugs are fouled but they aren't. They will turn over but then stall as if they aren't getting spark or fuel. After many tries, upwards of 15 turns of the key they go - and then run fine. They will do this warm or cold. Any thoughts?
What are the engine model numbers?
What sparkplugs and gaps?
What is the cranking rpm?
Where do you have the throttle and how do you choke it when starting?
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.