To rich?

Got questions? We got answers....
Post Reply
waldo177
Member
Posts: 23
Joined: 02:11 pm Apr 21 2015
Country:

To rich?

Post by waldo177 »

Why does my spark plug look this way?Image

Sent from my SM-S920L using Tapatalk
User avatar
Jaguar
Supporting Member
Posts: 590
Joined: 01:32 am Jul 03 2013
Country: Paraguay
Location: Paraguay
Contact:

Re: To rich?

Post by Jaguar »

because it is lacking periodic cleaning. the chocolate brown color on the ground electrode indicates near perfect jetting (at least in the RPM range in which it spends the most time)
Performance CDI -- KDX motocross mods -- the SR KDX -- expansion chamber analysis---> http://www.dragonfly75.com/moto/
waldo177
Member
Posts: 23
Joined: 02:11 pm Apr 21 2015
Country:

Re: To rich?

Post by waldo177 »

Ok thanks I just rebuilt this has a couple hours on complete rebuild, and seems to be rich on top end. May need to do chop test with new plug and tinker with it some more. Do you know the link to the proper jetting? I stumbled upon it once and can't seem to find it again

Sent from my SM-S920L using Tapatalk
marco220
Supporting Member II
Supporting Member II
Posts: 113
Joined: 05:22 pm Mar 29 2006
Country:
Location: NW Chicago Suburbs

Re: To rich?

Post by marco220 »

Looks rich to me. Remember you want to look down toward the bottom of the porcelain to get a good read on the color.

There is a Jetting Guide sticky under Jets and Needles - not sure if that's what you're looking for.
2002 KDX 220
RB'd Carb and Head

I don't crash often... but when I do, I'm going for style points!
User avatar
Julien D
KDXRider.net
KDXRider.net
Posts: 5858
Joined: 07:53 pm Nov 07 2008
Country: USA
Contact:

Re: To rich?

Post by Julien D »

You can't really read rich/lean from the tip of the plug unless it's drastic. You have to chop the threaded part off and read the ring at the base of the porcelain. Even that is only helpful when you do it very specifically. New plug, full throttle, kill it, pull the plug to chop it and read it. There are how-to's on this forum in the jetting section.
Image
User avatar
Jaguar
Supporting Member
Posts: 590
Joined: 01:32 am Jul 03 2013
Country: Paraguay
Location: Paraguay
Contact:

Re: To rich?

Post by Jaguar »

color only gives you a ballpark indication.
Go by how it runs, not by color
Performance CDI -- KDX motocross mods -- the SR KDX -- expansion chamber analysis---> http://www.dragonfly75.com/moto/
ohgood
Supporting Member II
Supporting Member II
Posts: 925
Joined: 10:00 am Jan 04 2014
Country:

Re: To rich?

Post by ohgood »

sure it's a little rich, but who cares if it's running well ? that's protection for the winter ;-)


i gave up on making the colors conform to the multitude of opinions on the interwebs (with pictures!) and went for the jetting guide on kdxrider. it's soooooo much easier to TUNE by feel than trying to get the plug colors where they should be.

some days I can go for 20 miles without any color on the plug, at all. other days, it starts showing in 5. wether it's the gas or the atmospheric conditions, i don't know. i go by FEEL now.
Post Reply