Spark Plug Question

[FinallyABoat]

We just purchased our first boat, and it has a 1989 Johnson J40ELC outboard. At my father's advice, I was told to change the plugs, so I went by the local dealer and purchased new ones. I was given L77 JC4, but when I removed the old ones, they were QL 78YC. Which ones should I be using?

Thanks

 

[seahorse5]

Re: Spark Plug Question

Here is a link to the official factory sparkplug chart:
http://continuouswave.com/whaler/reference/BRP/SparkPlugChart2008.pdf

 

[FinallyABoat]

Re: Spark Plug Question

Thank you Seahorse 5. However, it shows a completely different plug. Which one of the two I listed should I use? Is there any difference?

 

[rickdb1boat]

Re: Spark Plug Question

The correct plug for your engine is the QL78YC..

 

[FinallyABoat]

Re: Spark Plug Question

Is there a reason why the boat shop would say to use the other plug?

While I have the experts online, what brand/type of oil would you recommend for me to use when mixing the fuel. What is the best ratio?

 

[seahorse5]

Re: Spark Plug Question

Thank you Seahorse 5. However, it shows a completely different plug. Which one of the two I listed should I use? Is there any difference?

Did you read the chart wrong? It says QL78YC as long as you are sure it is an '89 40hp.

 

[FinallyABoat]

Re: Spark Plug Question

Absolutely read the wrong 40 hp. Any suggestions/knowledge to share on the oil?

 

[tashasdaddy]

Re: Spark Plug Question

oil is oil, as long as it is certified to be TC W3, outboard motor oil. it is fine. a lot of us use, walmarts Super Tech products, and Pennzoil products. high price does not mean it is better oil.

 

[FinallyABoat]

Re: Spark Plug Question

I just wanted to say thank you for all of the help with the plugs. I picked them up Friday afternoon and the engine started on the first few turns of the starter. I let it idle for about 5 minutes and it ran well. Now, we can't wait to go fishing next weekend...the weather prevented it this last weekend.

Any suggestions on a battery for the trolling motor and live well?

 

[tashasdaddy]

Re: Spark Plug Question

deep cycle, largest you can afford.