My turn for help

I have been fighting with carb #3. It's stupid ritch. #1,2,4 are perfect nice tan color on the plugs. I do have aftermarket exhaust. I stepped up the main jets two sizes. No pods. I have checked the float levels set #3 at the lowest allowable limit. New air mixture screw o - ring new choke plunger. It's still ritch with the air mixture screw in all the way. The bike is rideable. I see black smoke out the exhaust. I'm at a lost.

 

Why did you step the main jets two Sizes.........for what reason......

 

on your mixture screw do you have the washer on it? screw goes through spring then washer then o ring.
you say no pods, are you using the air box?.
check your enrichment plunger on carb 3 if it is not closing completly that could make you run rich
main jet asperator tube clean and all the little holes cleand out , if holes blocked you will run rich.
main air jet and pilot jet all cleaned out?.
do a plug chop on plug three both at idle to 1500 rpm and one at high speed this will help with what circuit is running rich.
are you sure plug three is firing? test with a spare plug connected to wire 3 and to motor for ground.

where are mixture screws set for 1,2,4 ?
what after market exhaust do you have?

 

choke plunger?

 

Check your vacuum line to the petcock to see if gas is leaking through the line

 

choke plunger = enrichment circuit plunger he is probably referring to ????

 

I stepped up the main because of the Mac 4 into one. With the stock jets the plugs where white at plug chop at 4k rpm. Now i have nice tan color. All the plungers are new from Len. Yes I have the washer in place. Tube is clean. Is there a way to block the well for the enrichment in the carb bowls to eliminate the plunger as a problem?

 

The vac line is on #2.

 

what plunger are you referring .....enrichment circuit is used for cold starts only.......meaning choke is on.......with choke off......enrichment circuit is cut off from supplying any more fuel to the combustion chamber

 

If the plunger is not sealing and i'm able to stop fuel into the enrichment circuit and now start to run better I know is the plunger.

 

so you want to plug up the choke (enrichment) circuit for a test, but not permanently. in the float bowl there's a hole in the side towards the bottom that lets gas go to the brass tube that leads to the plunger hole.
i'd put a drop of hot glue over it. it doesn't stick that well so it could be picked out when you need to. just don't force it in where the tiny jet is that always gets plugged up

 

The enrichment circuit ( choke, cold start...whatever you want to call it ) has a purpose.......I don't understand the purpose of wanting to temporarily plug it up.....

Going down the path here.....

 

Check your emulsion tube for an out of round condition where the needle goes into it. As well, check the needle to make sure the point isn't damaged.

 

I like the hot glue idea. I did have a look at the needle it looked good compared to the other needles. But I will check the emulsion tube for roundness.

 

Could it be that there is damage or corrosion where the enrichment plunger seats on the carb body, at the bottom of the plunger hole? There is a small conical mating surface there...you can use a little polishing compound and polish the plunger against the Al surface and make it mate really well.

 

I will work on the carbs this weekend and let you know how I make out. Thanks for all the suggestions. Keep up the good work.

 

To test the enricnment plunger seal.

 

Ding ding ding we have a winner. Winner winner chicken dinner. Wink 1018 was right . I replaced the emulsion tube and the diaphragm. Both parts looked good. Now I have nice plug color. I can't believe I chased this problem for three riding seasons and got it fixed in one weekend. I do have note about using hot glue in gasoline the hot glue dissolves fast. Thanks to all that helped to fix this problem. I feels good to fix this issue.

 

he wants to see if it is what is causing his rich condition under the assumption that his enrichment circuit is not closing /sealing completly when he shuts of the ER

 

it is always refreshing to to have someone solve their problems, shows what a little collective thought process can do.

 

Good to hear the problem is resolved. It helps others that may have similar issues. It gives them some ideas to look at when searching for answers.