Spark plugs too clean, running lean? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 10-22-2012, 06:40 PM Thread Starter
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Spark plugs too clean, running lean?

As the title states. Spark plugs are really, really clean and I'm pretty sure the bike must be running on the lean side. 2 shims, 140/40 jets, K&N filters, 2.5 turns out. Should I remove a shim and see what happens, or try 3 turns out?
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post #2 of 6 (permalink) Old 10-22-2012, 08:49 PM
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A pic of the plug would be nice...are they the color of coffee with cream ?...if so, thats perfect. You can try backing out 1/4 turn at a time and test. But w/o seeing the plugs, hard to say.



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post #3 of 6 (permalink) Old 10-22-2012, 11:00 PM
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How many miles should you go between adjusting and checking?

'95 Vulcan 750 - Purchased 8/2003 w/ 21,124 miles - passed 50K 9/3/15
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post #4 of 6 (permalink) Old 10-23-2012, 10:08 AM
Crap, I WAS in 5th gear.
 
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Shims or washers under the needle seat make it slightly richer, not leaner, at cruise with constant throttle.
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post #5 of 6 (permalink) Old 10-23-2012, 02:02 PM
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A lean mixture is more air related ( too much air ) than fuel related. Check your air intakes, for a leak at the headers, and air filters. After market exhausts could cause this also.

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post #6 of 6 (permalink) Old 10-23-2012, 08:21 PM
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Quote:
How many miles should you go between adjusting and checking?
20 miles under hard accels should show it (differences).



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