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199B What Spark Plug


bondy
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NGK BP 5 ES is good.

NGK BP 4 ES is my personal choose for trials riding, much better durability and color. The colder 5 seems to run to cold still black while the hotter 4 has a nice brown color as it should.

For trails and street riding I would use a 5.

Better are the old Champion N-12Y, they offer a broader temperature range but difficult to get in these days.

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Iridium plugs fire easier.

I used to run Champion N11Y or N12Y in my 325 Bultos. I think 12 is same heat range as NGK4.

Champion (QN86) is the only plug I have ever had fail prematurely, failed after about 45 minutes running for no reason

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