Evo Plug Help
Road Master
Joined: Aug 2006
Posts: 1,148
Likes: 157
From: Banning, CA
Carb adjust
Yes, on your carb 3/4 turn is a huge difference and it not only affects idle mixture but the
mixture in the whole first quarter of your throttle. It needs to be hot and I mean 20 minutes
of riding hot when you adjust it so the intake manifold temperature has stabilized. Btw - a
friend had the same problem with your setup when we're in Daytona in 1996 - new SE plug
wires fixed it after messing with the carb a bunch of times.
"Ninety percent of the time we look at the carb and ninety percent of the time it's an
ignition problem." - Smokey Yunick
mixture in the whole first quarter of your throttle. It needs to be hot and I mean 20 minutes
of riding hot when you adjust it so the intake manifold temperature has stabilized. Btw - a
friend had the same problem with your setup when we're in Daytona in 1996 - new SE plug
wires fixed it after messing with the carb a bunch of times.
"Ninety percent of the time we look at the carb and ninety percent of the time it's an
ignition problem." - Smokey Yunick
Last edited by lightweight bob; May 28, 2013 at 03:36 PM. Reason: spelling
Thread Starter
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Intermediate
Joined: May 2012
Posts: 27
Likes: 0
From: North Carolina
Ok i turned counter clockwise 1/4 turn today from what i have been having issue with....After reseting idle speed to where it needed to be.... Rode few miles up the road and back, when i pulled into drive and got to idle bike tried to cut off when i was opening garage door? i smoothly gave it gas and when i looked at the ground i noticed something i havent ever noticed (not that it hasnt been happening) If you look reeeeeeaaaallly close there is a slight blackness to air coming from exhaust at idle? Meaning rich, but yet i was to lean with the screw 1/4 turn clockwise just days ago? Im going to try new plug wires as stated above....Let ya know how it goes...Anymore suggestions are welcomed!
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
When adjusting my carb I do in 1/8 turn increments.
You turned it in one way 3/4 and then back 1/4 which means you are still a 1/2 turn from where you started.
I'd go another 1/4 turn and see what happens.
You turned it in one way 3/4 and then back 1/4 which means you are still a 1/2 turn from where you started.
I'd go another 1/4 turn and see what happens.
Road Master
Joined: May 2009
Posts: 1,232
Likes: 8
From: Powder Springs, GA
Okay I had something similar on my old evo chop with and S&S. Even though the enricher was supposedly down all the way it would hang up just a freaking hair. This may be a long shot but try this. When you adjust the enricher the arm itself attaches to a small round plunger going down into the carb body. Push down on this enricher plunger to ENSURE the enricher is seated all the way. Trust me it DOES NOT take much to richen it up. Turns out my enricher lever would hang up on my intake backing plate and I had to do some grinding. Hey worth a try. Good luck and let us know.
Road Master
Joined: Jun 2009
Posts: 1,062
Likes: 18
From: Beautiful SW Missouri Ozark Mountain Country
Don't know if this is your problem or not, but truer words have never been spoken about carbed engines. Be it bikes, cars, planes, tractors, etc, etc. 90% of carb problems are electrical.
Outstanding HDF Member
Joined: Oct 2010
Posts: 2,706
Likes: 14
From: Near Frankenmuth, MI
When you were talking about installing a new carb and having issues like blackened plugs I was thinking you didn't get the intake manifold sealed correctly.
It may be in need of re-jetting.
Be sure the choke is opening fully and staying off when running. I had an issue whenever I really get on the throttle and raced around, my choke will somehow begin to close on it's own. I don't have a locking nut system on the choke cable so I put a crimp in the metal choke cable housing making it a lot stiffer. Now, only once in a great while does the choke close slightly on it's own.
It may be in need of re-jetting.
Be sure the choke is opening fully and staying off when running. I had an issue whenever I really get on the throttle and raced around, my choke will somehow begin to close on it's own. I don't have a locking nut system on the choke cable so I put a crimp in the metal choke cable housing making it a lot stiffer. Now, only once in a great while does the choke close slightly on it's own.
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Thread Starter
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Intermediate
Joined: May 2012
Posts: 27
Likes: 0
From: North Carolina
Ok, going to try to see if pushing down on enrichner helps and depending on cost I mite go ahead with wires and new coil. I keep going back to electrical just as you all point ou simply because it only acts up if it hot outside? As if coil isnt sparking hot enough to burn the excess fuel before it fouls out...Let ya knw what happens within next few days.
Road Master
Joined: May 2009
Posts: 1,232
Likes: 8
From: Powder Springs, GA
Ok, going to try to see if pushing down on enrichner helps and depending on cost I mite go ahead with wires and new coil. I keep going back to electrical just as you all point ou simply because it only acts up if it hot outside? As if coil isnt sparking hot enough to burn the excess fuel before it fouls out...Let ya knw what happens within next few days.