SOME ADVICE PLEASE

coachk

coachk

Active Member
I am trying to learn as much as possible about my 06 K-9. This stuff is pretty basic to most of you but I have got to start somewhere. The first picture is my old plugs that had about 1k miles on them. Left is front plug and right is back plug. I changed out those plugs about 500 miles ago and the second picture is my current plugs. Same thing left is front and right is back. 3rd picture is how my carb currently looks. Help me understand what I'm looking at. Is the bike running too rich, too lean, etc etc.







Thank You
 
coachk

coachk

Active Member
Pipes are V&H as seen in avatar.

Every now and again I get a backfire. Mostly when decelerating.

.
 
coachk

coachk

Active Member
But why such a difference between pic 1 and pic 2 on the rear plug.

And why is the front plug looking like that.
 
aspen874

aspen874

Well-Known Member
Supporting Member
From what I've seen is that one cyclinder will run richer than the other. I would guess that run a little rich is better than lean because of cooling. My plugs look very similar to yours, my rear cylcinder is the one that is rich.
 
coachk

coachk

Active Member
I was reading another thread earlier(can't remember which one now) where a couple guys said that the tan/brown coloring on the porcelain is OK but white coloring is not. Thats what my main concern is..that the rear plug in the 1st pic is white and the rear plug in the 2nd pic is tan. Nothing was done to the bike in between plug changes. The only difference was that the first set of plugs were driven when it was much cooler out (Florida winter..lol). Would that make any difference?
 
Fibersnake

Fibersnake

Banjo Playing PsychoBilly
As the temp change in the air the ration will cahnge a little bit. That is most lilkely the reason of change in color. When it is colder, air tends be denser and if the fuel is adjusted in accordance with it, mosre likely to get more HP in cold weather than hot, all other things being the saem.

If you made no adjustment, when the air is colder, the A/f ratio change a little bit with slightly more fuel and thus towards the lean side.

The second set looks pretty good with maybe a slight richness, the first set looks lean on the front, but not terrible. If you ride where there is big change in temps during the year between like winter and summer, best to re-adjust, if it is just the occasional like cold spell, if they are right, should not be an issue.

With carbs and the design of our V-Twin, it is always someone what of a good mid point unless things never change.

The backfire through the pipes many times are due to the change in temps as well as the desing of the pipes. If it is real bad or outside normal, check for intake leaks, etc. Mine when tend to backfire as the season changes which when it becomes worse than my norm, I re-adjust the carb.
 
francoblay1

francoblay1

The Spaniard
outdoorsman26 said:
you are gunna have to drop the float bowel on your carb and see what jets you have in there??
Click to expand...
x2 :up:

I have had similar problem not long ago.... I had to go up from 29.5 to 31 and from 74 to 76 and now she runs great. popping on deceleration is something I am trying to live with.... but if you have a ¨good touch¨with your right wrist... lol ... it does work and it almost does not pop.... just dont close it to suddently and let the engine to burn its fuel.

My sparkplugs now they just look like cofee/milk. all good. We have had a discussion about that about two weeks ago in this Forum. well worth reading. I did learn alot. :2thumbs:

:cheers:
 
Moespeeds

Moespeeds

Well-Known Member
How does the bike run? Keep in mind when reading the plugs, unless you have an extreme situation like detonation that physically damages the plug, you are only reading your last throttle setting, which is usually idle.

After jetting a bike, I will put in new plugs, then get a reading at the top of 3rd gear, and at 60mph in 6th. If the bike runs ok, no need to worry about them, if you handed me those plugs I'd say they look fine.
 
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