Carbs
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Intermediate
Joined: Mar 2008
Posts: 38
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Carbs
Anybody got any preferences on aftermarket carbs ? ........ Pro's & cons re Mikuni HSR & S&S super E carb ? ......... Performance over stock CV andfuel returns on all three ?
If I fit an S&S on a 1991 FXR Evo will I need new cables ?
If I fit an S&S on a 1991 FXR Evo will I need new cables ?
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
RE: Carbs
The stock CV is undersized for most HD engines and it has a throttle plate restricting it even more. S & S carbs have been around for a long while so there are lots of tuners with experience with that carb, but it does have a sag in the torque curve that you can move around and minimize it but it will still be there if the carb is sized right for your engine. The Mikuni a slide carb with no throttle shaft can be bolted on after checking the float level jet sizes etc. (as with any carb) and it will work well. Add a little dyno tuning and the mikuni will usually leave the others in the dust. It probably gives you the best bang for the buck, and more tuners are familiar with it every day.
Stellar HDF Member
Joined: Oct 2005
Posts: 2,379
Likes: 226
RE: Carbs
If any of my bikes had come with a Kehien CV carb I would have definitly used it! Lightly modified, a stage 1 evo will pull 64 horses with a properly set up CV. Check out Nightrider.com for all the details to set it up.
I've run the Mik and it is a great performer. I currently run an S&S Super E and it works great as well, but I would have never used them if I already had a good CV to start with.
I've run the Mik and it is a great performer. I currently run an S&S Super E and it works great as well, but I would have never used them if I already had a good CV to start with.
Road Master
Joined: Feb 2007
Posts: 849
Likes: 2
From: where i'm at
RE: Carbs
Wifey's 97 has an S&S. Easy to work on and you get get parts everywhere. I've had the stock Keihin carb and it was fairly easy to work on and a couple of mods and it works like a champ. Mikuni is awesome but somewhat expensive and toughest to work on and set up. Just my experiences. BTY fuel injection now....I'm sold.
jim
jim
Road Warrior
Joined: Apr 2007
Posts: 1,354
Likes: 1
From: S.W. Florida
RE: Carbs
I renderered my opinion privately as you requested 
.
BTW, There is no sag or hesitation in my Super E it is all a matter of properly tuning and adjusting the carb. According to many experts a 31 intermediate and 74 main are ay too rich for my combination, should be a 29.5 and 72 they say. Sorry experts the bike absolutely responded to both jet changes with just minor adjustments.Decreasing the accelerator pump shot made a big difference as well.
. BTW, There is no sag or hesitation in my Super E it is all a matter of properly tuning and adjusting the carb. According to many experts a 31 intermediate and 74 main are ay too rich for my combination, should be a 29.5 and 72 they say. Sorry experts the bike absolutely responded to both jet changes with just minor adjustments.Decreasing the accelerator pump shot made a big difference as well.
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Extreme HDF Member
Joined: Nov 2006
Posts: 13,389
Likes: 26
From: Windham,Maine
RE: Carbs
Like you have read,if you already have a CV carb,stick with it.My personal favorites are the proper S&S carbs,sized for the motors.The difference is small between all of them.
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,198
Likes: 3,087
From: NW AR
RE: Carbs
I have an S&S on my bike and I like it. I have no flat spots. With three jets (idle, intermediate and high speed) you can tune it pretty well. It was way too much carb for the 883, though, and the jets that came with it were no where near what was needed on either bike, even though the label specifically said it was for that exact motor.
Mikuni's are a good carb too, no doubt. I'd consider one of those, and I was looking for one for the Sportster at one point, but I never could find one small enough. Everyone thinks they need a 44 or something and the 883 probably needs about a 32-ish Mikuni.
I went EFI on the 883 and my wife says "It's like driving an automatic transmission. You just put it in gear and go." In other words, real smooth and power everywhere. If I was to change my bike, I'd go EFI on that too.
Mikuni's are a good carb too, no doubt. I'd consider one of those, and I was looking for one for the Sportster at one point, but I never could find one small enough. Everyone thinks they need a 44 or something and the 883 probably needs about a 32-ish Mikuni.
I went EFI on the 883 and my wife says "It's like driving an automatic transmission. You just put it in gear and go." In other words, real smooth and power everywhere. If I was to change my bike, I'd go EFI on that too.