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carlesonra · 01-07-2013, 09:13 AM

While checking valves on my 2009 1200GS at 40,000 miles, I noticed spark plugs showing a lean mixture. I have a K&N installed but no other change and realize manufacturers have clean running as a priority. Question is: are other riders showing light spark plug coloring which is kinda normal or Is this something that needs attention and if so what? I have not noticed any spark knock when pulling at lower rpm.
Thanks for your time in responding.
Bob Carleson
Arroyo Grande, CA
R1200GS, R80RT, DR650

01-07-2013, 09:13 AM	#1
carlesonra ^OP n00b Joined: Mar 2007 Location: Arroyo Grande, Ca. Oddometer: 5	2009 GS lean mixture, harmful??? While checking valves on my 2009 1200GS at 40,000 miles, I noticed spark plugs showing a lean mixture. I have a K&N installed but no other change and realize manufacturers have clean running as a priority. Question is: are other riders showing light spark plug coloring which is kinda normal or Is this something that needs attention and if so what? I have not noticed any spark knock when pulling at lower rpm. Thanks for your time in responding. Bob Carleson Arroyo Grande, CA R1200GS, R80RT, DR650