burning up NGK spark plugs every third trip

[rib]

Hello all it has been a while since ive been on the forum but i have a question for all. i have a Yamaha 115 saltwater seiries outboard year 2000 i am running NGK spark plugs and about every third or fourth time out i loose a cylinder and have to limp back home, when i get home i pull the sparkplug cap off when the engine is running to find the cylinder that is not fireing and then i check my plug and find that it does not spark, i change all the plugs out and the engine runs fine for a few for trips, any suggestions.

 

[Trent]

Re: burning up NGK spark plugs every third trip

Sounds like oil fouling? Do you do alot of trolling?

 

[rib]

Re: burning up NGK spark plugs every third trip

it usually happens when i am trolling for the day i do alot of hit and run fishing offshore as well and when i am running fast all day it does not happen, is this common when trolling that the plug is burned it does not seam to be that fouled?

 

[petryshyn]

Re: burning up NGK spark plugs every third trip

Yamaha uses 2 different ignition systems. Not sure which one you have, but be sure you use the OEM recommended spark plugs.....

 

[rib]

Re: burning up NGK spark plugs every third trip

i am using the spark plugs that the book says to use but i will double check again tonight.

 

[Hawkeye1]

Re: burning up NGK spark plugs every third trip

I had a similar problem on a 200 Yamaha. Found the plug wire is made with a little spring with a hook on the end as the connector to the plug. Well where the hook pokes thru the wire to make contact there was corrozion. WHat happens is a low speed you dont have the juice to overcome the resistance in the connection once you speed up you have enough juice to overcome it. All I had to do was pull the boot back and trime about 1/2" off the wire and rehook the little spring metal conector back in the wire. I had actually went out and bought a new coil/wire and found this after the fact. Tested the old coil/wire and it worked so I kept it as a spare.