Carb issue that needs a lil help
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Intermediate
Joined: Nov 2013
Posts: 33
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From: RV, USA
Alright so I called my buddy at Truett and he said that it sounded like a fuel issue. Well I took the bike on a very little ride today to check things out since leaning out the carb. She is still idling pretty dang high, even when opening up the choke all the way. When backing out the idle screw, it does absolutely nothing. I've even twisted it in to see if she could go higher and no the idle speed doesn't change at all. What could be the issue on that? Cause I think the stall problem is because the carb is getting too much air and not enough gas when I hit the throttle, and thats what shuts the bike down while I ride it. The other peculiar thing is that the shut off situation always happen in 2nd or 3rd gear and never in first. I think when it hits the lower rpm, alot of air goes in, but not enough gas to equal out and the bike shuts down. So whats your thoughts on that? The jets I have in this Keihin are 165 main and 52 slow.
BTW - She stalled out three times while I rode today. And in 2nd to 3rd gear, the carb would pop when I'd let off the throttle and just idle.
BTW - She stalled out three times while I rode today. And in 2nd to 3rd gear, the carb would pop when I'd let off the throttle and just idle.
Last edited by brentswth20; Mar 9, 2014 at 09:14 PM.
Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
Alright so I called my buddy at Truett and he said that it sounded like a fuel issue. Well I took the bike on a very little ride today to check things out since leaning out the carb. She is still idling pretty dang high, even when opening up the choke all the way. When backing out the idle screw, it does absolutely nothing. I've even twisted it in to see if she could go higher and no the idle speed doesn't change at all. What could be the issue on that? Cause I think the stall problem is because the carb is getting too much air and not enough gas when I hit the throttle, and thats what shuts the bike down while I ride it. The other peculiar thing is that the shut off situation always happen in 2nd or 3rd gear and never in first. I think when it hits the lower rpm, alot of air goes in, but not enough gas to equal out and the bike shuts down. So whats your thoughts on that? The jets I have in this Keihin are 165 main and 52 slow.
BTW - She stalled out three times while I rode today. And in 2nd to 3rd gear, the carb would pop when I'd let off the throttle and just idle.
BTW - She stalled out three times while I rode today. And in 2nd to 3rd gear, the carb would pop when I'd let off the throttle and just idle.
Slow jet controls idle to about 1/8 throttle and you definitely have some issues in that range. The fact that you are unable to adjust the idle mix also indicates the slow jet is probably too small.
The needle controls 1/4 to 3/4 throttle. First gear passes through these ranges a lot quicker than 2nd or 3rd. You're having problems with Idle and transition to the needle...so work on these ranges. I like the 88 Sportster needle (N65C) to fatten up the midrange.
You're always going to have some problems with those pipes. It will be hard to get it to run smoothly through the entire range. I do think you'd be much happier with a CV carb as others have mentioned.
Last edited by nhrider1; Mar 10, 2014 at 11:51 AM.
Thread Starter
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Intermediate
Joined: Nov 2013
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From: RV, USA
I think you need to bump the slow jet up a size, and make sure the internal passages aren't blocked. You may need to raise or change the needle too.
Slow jet controls idle to about 1/8 throttle and you definitely have some issues in that range. The fact that you are unable to adjust the idle mix also indicates the slow jet is probably too small.
The needle controls 1/4 to 3/4 throttle. First gear passes through these ranges a lot quicker than 2nd or 3rd. You're having problems with Idle and transition to the needle...so work on these ranges. I like the 88 Sportster needle (N65C) to fatten up the midrange.
You're always going to have some problems with those pipes. It will be hard to get it to run smoothly through the entire range. I do think you'd be much happier with a CV carb as others have mentioned.
Slow jet controls idle to about 1/8 throttle and you definitely have some issues in that range. The fact that you are unable to adjust the idle mix also indicates the slow jet is probably too small.
The needle controls 1/4 to 3/4 throttle. First gear passes through these ranges a lot quicker than 2nd or 3rd. You're having problems with Idle and transition to the needle...so work on these ranges. I like the 88 Sportster needle (N65C) to fatten up the midrange.
You're always going to have some problems with those pipes. It will be hard to get it to run smoothly through the entire range. I do think you'd be much happier with a CV carb as others have mentioned.
Last edited by brentswth20; Mar 10, 2014 at 12:17 PM.
Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
You already have a 52 slow jet, so you have to go up from there. I think the next size up is a 55. Don't know for sure if the butterfly carb and CV use the same slow jets, but I found this listing for a butterfly carb.
http://jetsrus.com/a_jets_by_carbure...low_35-xxx.htm
Disregard the needle stuff. I just looked at a diagram and there is no needle in the butterfly carb...only the CV.
http://jetsrus.com/a_jets_by_carbure...low_35-xxx.htm
Disregard the needle stuff. I just looked at a diagram and there is no needle in the butterfly carb...only the CV.
Last edited by nhrider1; Mar 10, 2014 at 03:02 PM.
Thread Starter
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Intermediate
Joined: Nov 2013
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From: RV, USA
You already have a 52 slow jet, so you have to go up from there. I think the next size up is a 55. Don't know for sure if the butterfly carb and CV use the same slow jets, but I found this listing for a butterfly carb.
http://jetsrus.com/a_jets_by_carbure...low_35-xxx.htm
Disregard the needle stuff. I just looked at a diagram and there is no needle in the butterfly carb...only the CV.
http://jetsrus.com/a_jets_by_carbure...low_35-xxx.htm
Disregard the needle stuff. I just looked at a diagram and there is no needle in the butterfly carb...only the CV.
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Thread Starter
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Intermediate
Joined: Nov 2013
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From: RV, USA
Since its most likely going to take me at least 7-10 days to get a CV, I am just trying to get this running right in the meantime.
Thread Starter
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Intermediate
Joined: Nov 2013
Posts: 33
Likes: 0
From: RV, USA
You already have a 52 slow jet, so you have to go up from there. I think the next size up is a 55. Don't know for sure if the butterfly carb and CV use the same slow jets, but I found this listing for a butterfly carb.
http://jetsrus.com/a_jets_by_carbure...low_35-xxx.htm
Disregard the needle stuff. I just looked at a diagram and there is no needle in the butterfly carb...only the CV.
http://jetsrus.com/a_jets_by_carbure...low_35-xxx.htm
Disregard the needle stuff. I just looked at a diagram and there is no needle in the butterfly carb...only the CV.
And like I said earlier, I am going to get a CV very soon, but just want to get this Keihin running right like it did no more than 2 weeks ago.
Thanks for the help!