Need your help mixture screw base on this spark plug

vmax · November 19th, 2014, 02:57 AM

Hi guys,

I need your opinion to turn idle mixture screw base on this spark plug colour. What shoul i do? Turn in or turn out mixture screw. Bike fully stock accept full system exhaust. As you can see on the base ring not full brown colour. I use syock needles with mixture screw left 2,5 and 2.25. This image with the spark plug wre h is the right one. Thanks

DaBlue1 · November 19th, 2014, 05:10 AM

Your plugs look fine. In fact they look new. You're not really going to tell a lot on new plugs.

Sounds like the same question from your previous posts.

https://www.ninjette.org/forums/show...ighlight=plugs
https://www.ninjette.org/forums/show...ighlight=color
https://www.ninjette.org/forums/show...ighlight=spark
https://www.ninjette.org/forums/show...ighlight=spark

jkv45 · November 19th, 2014, 07:13 AM

Your idle mixture setting aren't going to change the color of your plugs significantly - unless you are idling all day...

Set the idle mixture screws at a base setting of 2 1/2 turns out, then go in or out 1/2 turn to see which direction makes it run better. If it runs significantly better, go more in the same direction until it runs worse. Then make adjustments in 1/8 turn increments back toward the base setting until you feel it's the best.

Another way to set the idle mixture is to adjust them until you get the highest hot idle speed, then go slightly (1/8 turn +/-) richer. Going slightly richer usually smooths out the transition from the idle circuit to the needle, where having it adjusted "right on" can sometimes give you a little lean stumble as it transitions.

When you are done you will most likely need to set the hot idle speed to back 1300.

If you carbs are out of sync you may not be able to get it to idle well no matter where you set it, so be sure they are synced before making fine adjustments.

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November 19th, 2014, 05:10 AM	#2
DaBlue1 Long Time Rider Name: Blue Location: Charlotte, NC Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.	Your plugs look fine. In fact they look new. You're not really going to tell a lot on new plugs. Sounds like the same question from your previous posts. https://www.ninjette.org/forums/show...ighlight=plugs https://www.ninjette.org/forums/show...ighlight=color https://www.ninjette.org/forums/show...ighlight=spark https://www.ninjette.org/forums/show...ighlight=spark

November 19th, 2014, 07:13 AM	#3
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	Your idle mixture setting aren't going to change the color of your plugs significantly - unless you are idling all day... Set the idle mixture screws at a base setting of 2 1/2 turns out, then go in or out 1/2 turn to see which direction makes it run better. If it runs significantly better, go more in the same direction until it runs worse. Then make adjustments in 1/8 turn increments back toward the base setting until you feel it's the best. Another way to set the idle mixture is to adjust them until you get the highest hot idle speed, then go slightly (1/8 turn +/-) richer. Going slightly richer usually smooths out the transition from the idle circuit to the needle, where having it adjusted "right on" can sometimes give you a little lean stumble as it transitions. When you are done you will most likely need to set the hot idle speed to back 1300. If you carbs are out of sync you may not be able to get it to idle well no matter where you set it, so be sure they are synced before making fine adjustments.