Lee Bryant
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Registered: 10-2007
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spark plug crossover?
I am having trouble getting a new spark plug for my 601 superflow. the plug in it is a NGK B 6 .
Does anyone have a cross over or new NGK number?
Thanks
Lee
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12/7/2008, 12:59 pm
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shaneb
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Registered: 06-2007
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Re: spark plug crossover?
NGK's naming conventions are here:
NGK numbers decoded
So apparently "B6" only tells you that it has a 14mm thread and the heat range is 6. This leaves a lot of other variables like thread reach and composition of tip.
On scooterbbs, someone several years ago reported successfully running B7HS, which would be a slightly colder plug that sticks slightly farther into the combustion chamber (12.7mm instead of 9.5mm reach). The S just means "standard electrode". Assuming the piston won't smack into the plug if the plug sticks an extra 3mm into the combustion chamber, a B6HS should be fine. It also appears that many of the 2-stroke Vespas run B6HS plugs as stock, so they should be easy to find.
B-6S or B6S should be the same as B6 (the "S" just means standard tip). I see numerous sources on the web...
As for other brands, I've pretty much gone over to all NGK. When I had an old Honda motorcycle with an iffy charging system, the NGKs lasted far longer before fouling than Denso or Champion plugs, so I've been sold on NGK ever since.
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12/11/2008, 2:54 pm
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Lee Bryant
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Re: spark plug crossover?
Thanks for the reply.
I did find the longer version but was afraid it would be too long and hit the piston.
I will go get one and turn the motor over slowly to see how it works.
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12/11/2008, 7:38 pm
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shaneb
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Re: spark plug crossover?
Some places with the B6 (or identical B6S) online:
http://www.outerbanksoutfitters.com/product/365510619.htm
http://store.usavediscountmarine.com/ngk-b6s.html
http://www.keenzo.com/showproduct.asp?M=NGK-SPARK-PLUG&ID=3141041&ref=GB
Looks like the plug was used in numerous outboard engines...have a boat shop nearby?
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12/11/2008, 11:06 pm
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