Plug color

[Tapartacus]

What's going on here? This doesn't look right.http://www.flickr.com/photos/95019607@N00/7860607972/#in/photostream/

[FJmonkey]

Your Goth nail polish needs touch up. Plug looks rich. Just one cylinder or all of them?

[Tapartacus]

Comedy! my kids got a hold of me! FJMonkey all 4 plugs look like this

[FJmonkey]

I am not a carb guy so you will need their help. But they will need more information about your current bike set up. For example, what were the riding conditions just before you pulled the plugs? Stock carbs? Jet kit? Stock seat or Corbin? Lefty or Righty? Toilet paper over or under? the entire works.... Spill it...

[Tapartacus]

All stock set up. Carb kit from Randy. Regular riding. Don't really know what else there is to say. After blipping the throttle idle hang just for a second or two then settles into normal idle at about 1000 rpm

[FJmonkey]

All stock set up. Carb kit from Randy. Regular riding. Don't really know what else there is to say. After blipping the throttle idle hang just for a second or two then settles into normal idle at about 1000 rpm

Not really knowing the carb stuff I am gonna guess the needles are a touch to high letting too much fuel in.

Come on carb guys help out!!!

[Tapartacus]

[andyb]

Is this after a good run, or just idling in the garage?  Choke moving freely and turning all the way off? 

[Alf]

Please, details about the Randy carb kit

By a general rule, you must set first the main jet before touching anything more

[fj11.5]

Probably sort the idle out, by turning the " mixture " screws in on top of the carbs,  all the way in till they just seat, the wind them out 2.5 turns each,

[Tapartacus]

So I turned the mixture screw IN a half turn. Blip test is solid, as idle returns normally with no hang or drop. Stock kit for 92 -
#110 Main Jet
#155 Air Pilot Jet
#42.5 Fuel Pilot Jet
from RPM. Left stock needle in, not adjustable.
Still rumbles on the deceleration at 1500 rpm,(and by stumble I mean I can feel a distinct vibration on deceleration under my ass while coming to a stop, my 89 does not do this) maybe I need to lube engine mounts, a little leery to do that though not too sure of my skill set. Anyway thats all I have. Thanks for the replies.

[racerrad8]

It is rich as noted by the sooty black plug.

It could be:

Idle mixture adjustment
Too large pilot jets
Float level too high
Fuel leaking into float bowl bypassing N&S (float level)
Choke circuit not closing fully
Dirty air filter
Carb Sync

Randy - RPM

[SlowOldGuy]

When I noticed roughness during decelleration on my '93, it was frozen motor mounts.

That 42.5 idle jet is not helping the plugs.

DavidR.

[Tapartacus]

Hi David, did you fix the mounts? Did it help?
Andrew

[yamaha fj rider]

Please, details about the Randy carb kit

By a general rule, you must set first the main jet before touching anything more

Please help my understanding. When working on jetting in the past (mostly dirt bikes) we started with pilot jets and worked up from there? Because of the overlap. Is this different on four cylinder street bikes? Thank's for your input.

Kurt