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Please read my plugs.

  • Thread starter Thread starter Quick Cal
  • Start date Start date
Q

Quick Cal

Guest
The valve's have been shimmed, the carb's rebuilt, and bench synced. I can't afford the full sync at this point in time. I've been buying too many NOS part's for my 72 Yammy project. But I'm getting ready to show the GS some love. After all, it's my daily driver to work. :D

I get a little off idle stumble. It clears right up.

I've had 2 different people tell me it's way too lean. But after looking at a youtube video, it says it's too rich because of the black around the base. :confused:

I'm running the specified D8EA plug's. So what do you guy's think. Thanks

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Not bad. Not rich.

Have you played with the pilot mixture screws? Might help to do so.
 
Truthfully. I haven't touched this thing since last year. But I had the same problem then too. I can't remember what I've done. :-s

I'll check the screw's tomorrow. Do you think I'm a little lean?? Thanks
 
#4 in the upper photo is the only one that looks a little rich, but it's not incredibly sooty. In the upper photo, it almost looks a little oily. In the bottom photo, #4 loses some of the blackness.

To my eye and on my monitor the electrodes, with the exception of #2, look a touch on the white (lean) side, but I do see some brown in all of them as well.

Under what conditions did you pull the plugs? It might be that your idle mix is a bit lean, but you are running a bit rich in the mid-upper throttle ranges.
 
Number 4 is a bit rich, turn the mixture screw IN a 1/4 turn.
 
Man you guys are good,,or I have really bad eye's,,,which I do. :cool: It's hell getting old.

I'm holding these plug's in my hand and I can't see what you guy's see. I'll try your recommendation's and see what happens.

One thing to mention. When I first start the bike in the morning, I get some smoke out of the exhaust on the right side. It takes about 10-20 seconds to burn off. I'm assuming I have a leaking valve seal. Do you think that could be what you're seeing on #4 plug. Thanks.
 
Quick Cal said:
Man you guys are good,,or I have really bad eye's,,,which I do. :cool: It's hell getting old.

I'm holding these plug's in my hand and I can't see what you guy's see. I'll try your recommendation's and see what happens.

One thing to mention. When I first start the bike in the morning, I get some smoke out of the exhaust on the right side. It takes about 10-20 seconds to burn off. I'm assuming I have a leaking valve seal. Do you think that could be what you're seeing on #4 plug. Thanks.
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there white! "LEAN"!!! want tan color, dont worry about the black circle
the center and electrode is what you look at
 
Way too lean. You running a stock filter or pods? How about the jetting of the carbs? Keep that up you'll burn a valve and/or piston. Plugs need to be a medium to dark tan at the electrode.
 
Everything is bone stock.

So should I raise the needle's a notch. :confused:
 
How old are the plugs? If they are brand new then they haven't burned in yet (got their running color.) Though if they are older plugs then You need to richen the mixture some how. Maybe the main jets as well? Check for air leaks, vacuum leaks first those will lean out the mixture as well. If those check out okay then the fun starts.

Like BigD 83 said what conditions did you pull the plugs? How long was it running, idling, twisting the throttle, were they under load like for ride? etc etc, Process of elimination starts.

Take the bike out and run it at 60-65 mph for a few miles then close the throttle and hit the kill switch. Yes make sure the clutch is in when ya do that lol. Then pull a couple of the plugs and see if the color has changed any.
 
mrbill5491 said:
Take the bike out and run it at 60-65 mph for a few miles then close the throttle and hit the kill switch. Yes make sure the clutch is in when ya do that lol. Then pull a couple of the plugs and see if the color has changed any.
Click to expand...

That's the way to do it.

The FUEL screws are very sensitive... so make sure you do your adjustments in 1/8th turns, not 1/4 turns like your AIR screws... especially on a stock bike with stock airbox and exhaust.

They don't look all that bad... 1/3/4 all look to have a slight carboning on the electrode, but not aweful.

Ride the **** out of it for a few days... then do a plug chop. If you're not feeling any hesitation/hanging idle/poor cold-startup... everything should be A-OK to just ride it like you stole it and break those plugs in.
 
Plugs were new last year. Can't have more than 1k on them. I've never done a highway chop. I just pull them when I come in from a ride.

I'm a little confused. Does turning the pilot screw (the one I had to remove the plugs to get to) out,,counterclockwise, make things more rich, or more lean.

I just checked where I was at on the pilot screws. It was only 2 turns out. I put them at 2.5 and went for a short ride. It might be wishful thinking, but it seems a tad better. It did burn off some of the oily looking stuff from the plugs.

I'm going to go pull all the plugs and post a pic.
 
Ok. They seem to be burning off some of the black stuff on there. They are defenetly getting cleaner. I only rode it 5 miles. They don't look quite as white and porceileny. More ashed over.

By looking at the new pics it seems I need to put some miles on it and finish burning them clean.

Does turning the pilot screw out, counterclockwise,, make it more rich, or more lean. I just want to make sure I'm going the right way so I don't go too lean and mess things up. :eek:


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So, D8EA plugs. What are these off of because a gs650 would have a b8ea or something with 14mm threads.
 
you might want to try 1.5 turns instead of 2, that would give a lil more fuel to air
 
platinum2 said:
you might want to try 1.5 turns instead of 2, that would give a lil more fuel to air
Click to expand...


Please forgive me if I'm missing something here. So note #2 from one of the tutorials is incorrect. :confused:

Note #1: Follow the images from Left to Right, Top To Bottom for the proper sequence. Also, there is not a "slide 15" so, don't go looking for it!​
Note #2: Bill Kingston has brought it to our attention that the references to a Pilot Air Screw may be incorrect. He states that on these carbs use a Fuel Flow Screw instead. This means that you are controlling fuel running through the passages with this adjustment, not air. So when turning the screw counterclockwise you are increasing fuel flow and when you turn it clockwise you decrease fuel flow.​
 
On your 82 model the carbs should be of the constant vacuum type (big round flat tops) and on these carbs the idle mixture screw is exactly that: a mixture of fuel and air is regulated by that screw. So turning the screw clockwise will result in leaner condition (less fuel/air mixture), and turning it counter clockwise will result in more fuel/air mixture (richer).

You should adjust each idle mixture screw to obtain the highest smooth idle speed. Using the "search" function, you will find many posts on how to do this.

You should also be aware that it is possible to get different lean/rich conditions throughout the rev range, depending on how wide open the throttle is and which fuel circuit is in operation. Up to about 1/4 open throttle, the mixture is determined by the pilot circuit (idle mixture screw and pilot jet). So in order to check the pilot circuit, you must run the bike at 1/4 throttle and then follow the correct procedure (clutch in; kill switch off; close throttle etc) and look at the appearance of the plugs. Similarly, at about 1/2 open throttle you will see the effect of the jet needle position; and at wider open throttle you will see the effect of main jet size. There is a lot of information to be found with "search" (plug chops), explained much better than I am able to explain it.
 
They look great, and are cleaning up nicely. You can turn the screws out a little more if it gives you a better idle and less hesitation. If it runs strong throughout the rev range, you're golden. The 650 can be very finicky (I've had 4 of them), and if you have a problem, it will almost be unrideable.
 
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