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Author Topic: Yamaha 15 horse 4 stroke outboard sparkplug  (Read 1874 times)

Offline Bofire

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Yamaha 15 horse 4 stroke outboard sparkplug
« on: September 03, 2018, 05:15:25 PM »
I went and got a new plug, the standard plug per the book is a DPR6EB-9, they gave me a champion plug. The new plug is a 5/8 size, the plug that is in the motor is bigger than 5/8. What size is it? slightly larger than 5/8 do they make metric plugs?
thanks
Carl
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Offline Bofire

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Re: Yamaha 15 horse 4 stroke outboard sparkplug
« Reply #1 on: September 04, 2018, 05:14:53 PM »
Those charts show no replacement, it still does not work with a 5/8 plug socket, the replacement one does???? any way, I got rid of the bad gas, put in new, cleaned the sediment bowl. Got it to start and idle a bit, kept doing it, eventually got it to idle and now runs great, GREAT!!!!! Now I need to find out about the spark plug and what socket it takes.
Carl
When the chips are down..... the buffalo is empty!!

I do not shop at Amazon

Offline branches

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Re: Yamaha 15 horse 4 stroke outboard sparkplug
« Reply #2 on: September 04, 2018, 06:48:54 PM »
The size might be 13/16 that is what my plugs are for my 25 horse.

Offline Grit dog

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Re: Yamaha 15 horse 4 stroke outboard sparkplug
« Reply #3 on: September 04, 2018, 10:43:41 PM »
Vast majority of plugs are 5/8 or 13/16, even on every metric, European or Japanese engine I've had, but there are also 3/4 and 18mm socket sizes. Not sure I've seen one before.

Offline luckyman

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Re: Yamaha 15 horse 4 stroke outboard sparkplug
« Reply #4 on: September 05, 2018, 05:13:15 AM »
My Honda motor cycle has a weird size plug also. 5/8, 3/4 & 13/16 wont fit.
 I'll have to find a 18mm plug socket and see if it fits.
I'm not sure.

Offline birddogdad

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Re: Yamaha 15 horse 4 stroke outboard sparkplug
« Reply #5 on: September 05, 2018, 06:49:04 AM »
call the tech team at boats.net       i have had great success there and prices are good for all oem stuff
USN retired
1981-2011

Offline Alchase

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Re: Yamaha 15 horse 4 stroke outboard sparkplug
« Reply #7 on: September 05, 2018, 02:41:58 PM »
NGK sight says it is "5/8 (16mm)" , I had bad gas in it, got fresh gas in, pulled it over about a 100 times, got it to sputter, more and more, then it took off and ran fine!!! I am going in to town to the Boat store and look into this plug thing.
Thanks
When the chips are down..... the buffalo is empty!!

I do not shop at Amazon

 


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