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Old 09 April 2006, 14:38   #1
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Country: UK - England
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What size spark plug socket

Hi new to this forum and new rib owner.Given up my jetski and bought a 4.5 mtr Ribeye with 50 four stroke Yamaha,so far very happy with my purchase and waiting for my first trip out (apart from a brief try in the mouth of the River Exe when i bought her) done a few jobs such as fit a fuelfilter/water separater and a battery master switch,and a bit of general tidying up, tho. being that she's a 2005 hull,didnt need much of that.Major problem so far? trying to fit the overall cover over the console and the A frame!!! what a struggle

Reason for posting to this forum, can someone advise me what size socket I need for the small NGK spark plugs on my motor a F50aet. Tried all my traditional plug sockets but nowt fits.
Your help appreciated.
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Old 09 April 2006, 14:48   #2
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Bike plug spanners!

I'm guessing that's the same odd size as fitted to a lot of bikes-take an old plug and try your local bike shop.

I THINK it's 18mm but not 100% without spending half an hour getting down to the plugs on one of my bikes.
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Old 09 April 2006, 14:56   #3
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if its only a year old did it not come with a small toolkit which should include a plug socket?
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Old 10 April 2006, 02:35   #4
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Spark Plug

Thanks for your replys ,no definitive answer yet the engine is 2003 and the previous owner acquired and fitted it with the help of a marine Engineer (?) so no tool kit,in fact I am still waiting for an owners manual to turn uo. However the engine runs very well and seems excellent .
So, any other ideas for typical spark plug socket size ?
Thanks
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Old 10 April 2006, 04:48   #5
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Depending on access, would it be possible to get in there and meassure one of the plugs with a set of vernier gauges?

Doubtful I know but it would be possible on some engines I've worked on, might be worth a shot.

Andy
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Old 10 April 2006, 08:37   #6
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i think you will find it is a 16mm

andy
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Old 10 April 2006, 14:38   #7
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Spark Plug

Thanks all, great help
Problem measuring,hole very small,dont posess anything that would go down there and measure.
Only just got it, so no spare plug
16mm sounds about right,might pop into my local toolstore on way home from work tommorow and take pot luck.


Or phone my local Yamaha dealer I suppose


Thanks anyway


Stuart
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Old 11 April 2006, 14:25   #8
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Borrow a set of deep sockets from a friend, and try them out.

The only real difference between a deep socket and a spark plug socket is a foam insert to cradle the insulator (well, that, and about another 50% of the cost.)

jky

Sorry; just thought about this: Buy a new set, and take those into your hardware store. You *are* going to be replacing them, right?
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Old 11 April 2006, 15:36   #9
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Yes Ivasaki course I will,for the new season just about on us, but needed to find a way to get the old ones out first.
Problem solved!
NGK web site explained the identification numbers, mine is a 12mm plug (thread size) went along to a local motor cycle dealer and picked up a plug wrench straight off,I will still have to get a deep socket so I can torque the plugs eventually.
Anyway ,thanks for the response ,I'll keep visiting the site I'm sure it wont be long till I need some more help or who knows maybe even offer some oneday, (well I was an aircraft engineer once a long time ago you know)

Now where to get a cheap set of DPR6EA-9's, Google here i come .......
Stuart
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Old 11 April 2006, 15:37   #10
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By the way I think Andy9466 is right ,the socket size seems around 16 mm -thanks
Stuart
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