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1992 suzuki DT 99 outboard sparkplug not hot enough

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waggels4

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I have a question concerning

I have a question concerning a 1992 suzuki DT 9.9 outboard. The recommended plug is NGK B6HS-10. This plug is not hot enough. I can't seem
to find out from anyone what the next hottest NGK plug is. Any help would be greatly appreciated.
 
The number 6 is the heat rang

The number 6 is the heat range. As the number gets higher the plug tip gets hotter.
 
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