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Old 04-17-2018, 08:56 AM   #204 (permalink)
jkv357
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Quote:
Originally Posted by Xringer View Post
Why two spark plugs? I've heard of a redundant spark plug on an ultra-lite airplane,
but motorbikes don't crash if a spark plug fails..
Pretty sure it's just to reduce emissions by ensuring more complete combustion. There's no power gain to be had.

The SV650 went to 2 plugs per cyl in 2007, and I'm pretty sure it didn't bump HP but may have increase MPG slightly.
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