ok, my manual says for me to use a br10 spark plug, but my bike came with a br8 when i bought it (used). what is the difference? did i ruin anything? should i change it? it is working fine right now.
my 88 kx 125 used a 10 stock, but as well i used a 9, the 9 would be a better choice for you 85 :nod:
the difference is heat ranges, 10 be cold and 8 being hot a colder plug has a shorter insulator which dissapates heat quickly, while a hotter plug has a longer insulator and dissipates the heat more slowly. ;)
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