Question about 2004 Yamaha FJR 1300

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Yamaha runing rich

I am at a loss on my bike. It has a hesitation right at the start and after its going it runs perfect. The idle is steady and strong. The power after about 2500 rpm is great but I just can't get is to launch very well. I have checked my plugs and when idling it is running rich, but when I have taken it for a good ride and take out the plugs they look good. I have had my carbs cleaned and run seafoam through them. Where should my air/fuel mixture adjustment be set? They are now about 4 turns out which seems a little excess. The Haynes manual does not have much on setting the carb. Can any one Help

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  • Anonymous Apr 27, 2009

    2006 v star. has new hard krome pipes been re jeted by a dealer. after a couple months it loads up at and only runs on one cylinder and then dies. if you take off and get past the low speed it it smooths out and runs perfect. but when you come to a stop it well load up and die. when it loads up is has a little black smoke out the tail pipe and when you pull the plugs you can tell it is rich. i have cleaned from the t=fuel tank all the way to the carbs. still does it.



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With the mixture screws out 4 turns, I would bet your piloit jets are too big. Try the next size down and see how it runs at low rpm. You don't want the mixture screws turned out 4 turns on any bike, nor all the way in. 1-3 turns out, closer to 2 is better, is a good general rule for setting them on most carbed bikes. If you have the right jets in the carbs, a quarter to half a turn on the screws makes a noticable difference, if you can crank them around all over and not change the way it runs much, the jets are wrong.

Posted on Nov 10, 2008

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Take a look at this web site. Follow their instructions and I'm sure you will be able to fix the problem.

Posted on Jun 09, 2009


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