Check these plugs out

They have about 3k miles on them. looks...rich to me. idles well and runs pretty well (makes decent power methinks)

What do yall think? Reason I ask is that I rebuilt the carbs myself. I guess adjusting the jets could lean them out a little?

thanks in advance:tongue:

 

They look OK from here.

 

The two plugs with the tan colored deposits are fine.

Plug #2 (in the top pic) looks like that cylinder is running a little rich (or has an internal oil leak), but still looks reasonably good to me.

 

Yea, top pic left looks good, the other one looks a bit rich to me.

 

I'll throw in here, just because. You can look at plugs for a couple of reasons. Three of these look 'okay' and one (right side top) looks iffy (is that oil or ?). But this assumes you're taking a somewhat 'casual' look rather than anything serious.

If you want to judge fueling, you would need to do a 'plug chop', where you run the engine at WOT for some reasonable period (like 1st - 3rd gear), then shut it down using the kill switch. Then you pull the plugs and look at them. If they looked like these after a plug chop I would say you're running a tad rich (with the obvious question about #2).

 

Yours are all a bit dark, imo. The darkest plug could have a high fuel level, low compression, or bad ignition voltage.

Best power, least carbon build up is always on the leaner end of the scale.

Photo at top left is what i aim for.

Unless you do a high speed run to clean some deposits off, it's easy to get the wrong idea about plug colors.

Are those plugs you're using the right ones for the bike ?? You could try switching from 9s to 8s and see what ya got.