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Old October 5th, 2016, 02:23 PM   #4
Vintage Screwball
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Name: B
Location: Washington
Join Date: Feb 2016

Motorcycle(s): 2011 Ninja 250, 2008 Ninja 250, 2019 KTM 1290SDR, 2017 FZ10

Posts: A lot.
MOTM - Mar '16
Originally Posted by Wanderer View Post
My guess would be that the top one is running slightly rich and the bottom one is about right.

Well, nope. Not the answers I was expecting.

Bottom is perfect on 92 No Ethanol. Top is 100LL/92 No-E 50/50 mix perfect tune. Tested both on a dyno.

I always thought the bottom one looked a little lean. Porcelain is perfectly white but the timing is good if you look at the strap. Idle is a tad on the rich side, which the dyno sheet reflects. Base circle is a bit dark.

You're pretty good at reading plugs. Carry on.
Goin' fast on slow bikes!

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