mikuni tuning
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Joined: Mar 2011
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mikuni tuning
hey all. trying to get some more info on tuning the mikuni carb on my 2000 fxdl. at high way speeds with the throttle goin from half open to 3/4 or more open, it stutters, which is a lean setting. what is the best way to tune it? the website offers very little info on how to do it properly. thanks for any and all help!
Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
Unlike the stock CV carb, the Mikuni has a lot more adjustment and there isn't the same small number of jets that work.
I too gave up with the "recommended" jetting and trying to adjust it by feel. I bought and used a wideband O2 meter. The jetting I ended up with was nothing at all like I had to start with.
If you you don't want the hassle of buying and using your own O2 meter then I strongly suggest getting it dyno tuned.
I too gave up with the "recommended" jetting and trying to adjust it by feel. I bought and used a wideband O2 meter. The jetting I ended up with was nothing at all like I had to start with.
If you you don't want the hassle of buying and using your own O2 meter then I strongly suggest getting it dyno tuned.
Outstanding HDF Member
Joined: Aug 2009
Posts: 2,938
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From: NC
hey all. trying to get some more info on tuning the mikuni carb on my 2000 fxdl. at high way speeds with the throttle goin from half open to 3/4 or more open, it stutters, which is a lean setting. what is the best way to tune it? the website offers very little info on how to do it properly. thanks for any and all help!
Increase main jet size and retune your AP duration.
Tourer
Joined: Apr 2011
Posts: 368
Likes: 2
From: Oceanside
From my understanding of the mikuni the main jet regulates fuel flow at mostly wide open throttle. Try changing the position of the clip on the needle first. The thing about them with four different fuel circuts really fine tuning can be a pain. After my 5th or sixth time changing jets and the needle I just let a pro dyno it. Case closed for me.
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Joined: Aug 2005
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Mine has a serious flat spot at 3500 when I smack it hard too. Gonna have to try this accelerator pump. When I am cruising there is no issue.
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