1990 flt
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
That's a rich condition. Check the air cleaner, then if it's clean look at the carb. There is an off chance that the spark is weak and not burning all the mixture. Check these out and get back to us. Also what carb are you running??
Road Captain
Joined: Jun 2008
Posts: 640
Likes: 13
From: Hickory, NC area
I'll throw out two suggestions.
1. I know some people like the Autolite plugs, but I found the NGK to be far better, especially the iridium ones. They fire much better and don't gum up as much in my 90 FLHTCU.
2. It sounds like it is simply over-jetted. Have you tried dropping the main jet a size?
Finally, you might run some Seafoam through the tank - I like that stuff and it does a good job of cleaning fuel systems.
1. I know some people like the Autolite plugs, but I found the NGK to be far better, especially the iridium ones. They fire much better and don't gum up as much in my 90 FLHTCU.
2. It sounds like it is simply over-jetted. Have you tried dropping the main jet a size?
Finally, you might run some Seafoam through the tank - I like that stuff and it does a good job of cleaning fuel systems.
Elite HDF Member
Joined: Oct 2005
Posts: 3,872
Likes: 83
From: Canton, Michigan
If the bike is totally stock (carb, cam, intake, exhaust). It is highly likely that you have a over-rich mixture. This can be caused by a number of issues with the CV carb.
Definitely check the enrichner. If it's not 'pushed all the way in' you will get the rich condition. What RPM is the bike idling at when warmed up?
Check the float needle. It could be 'gummed' up and causing the bowl to overfill.
Check the float level.
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