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I own a 2006 Street Glide, carbed, with a Stage One kit. Python pipes. Would it be foolish to put an S&S carb on it? Would performace change? I don't dislike the HD carb, just looking for a simple performance upgrade without getting into the motor.
I agree with Bryan. Stock Harley carbs are pretty good units and not real difficult to tune for mild performance. You can buy the parts for a primary gear change to the 3.37 for about the same price as an S&S or Mikuni. Much better bang for the buck going to a gear change. It will act like a completely different bike. You would be hard pressed to feel the difference in the carb change. Throttle response might be better, but seat of the pants would not be as big a difference as the 3.37 swap.
I went with the S&S after I did the S&S 510G cams just because I couldn't get the Stock C/V carb tuned right. The guy doing my Dyno tune talked me into doing the S&S Super E installed with a Dyno tune for $350.00. Bike runs good, but if I wasto do it again I would go with a Mikuni.
Half the fun of owning these toys is the tweaking part of it.You could play with the Harley carb a little and save a few penny's.Modifing the performance is so personal it is hard to suggest things.
S&S I have fuel injected,S&S and Mikuni on different bikes. Both S7S and Mikuni are great products. The S&S is a little more tuneable in the long run and Mikuni will give a good throttle response. Again, personal choice, but IMO the HD carb is very limited when it comes to tuning.
I actually work for Keihin US and can give a little comment on our carbs (OEM), although I'm sure you can understand I don't want to comment about my competitors!
The OEM CV carbs are tuned primarily for emissions. Because of that there are some compromises in the idle and off-idle settings that cause lean running. Any reputable dealer will be familiar with these issues and would be able to help you fix them pretty easily. Unfortunately, the lawyers and Uncle Sam won't let us talk about that. As for performance, the carb was designed to provide smooth running through the rev range, included smooth idle and low end torque. If you want a lot of top end power, going to an FCR or other flat slide type carb will give it to you, but at the expense of low speed performance and smoothness. The 44mm CV was introduced to add more air flow and horsepower for engines that have been modified for displacment. We have recently added the 51mm CV for 100, 110, and bigger engines. These are designed to give you power but still keep good tunability and smooth running throughout the rev range, not just top end.
Hope that helps a little... I'd be happy to answer any other general carb questions, but I don't know about specific setups. As OEM we really never got into that.
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