I've looked at articles about installing HSRs, jetting them, etc. I can't find why one would switch to an HSR. What are the advantages? If this posted somewhere feel free to tell me to shut it and go use the search tool.

The carb guru's will argue this but for most guys to who a carb is a mystery....the HSR is a much better running carb by its nature.
The stock one is junk in my opinion, finicky and just not sized correctly not to mention it has to have a fuel pump.
I took an HSR out of the box (jetted for an HD) bolted it on and have driven it for 5 years without a lick of problems. good power and mileage and certainly much smoother.

Somebody else will give you the advantages. Just remember, that your CV carb will compensate for elevation changes, and the HSR won't.

It is a performance carb. Everything is connected to the throttle, so the slight delay while waiting for the slide to rise, isn't there. It can also be tuned with more alternatives. It is a real pumpless carb, although IMPO, that's not enough of a selling point, when I have two that are pumpless and trouble free with the CV's.

IMO there is no advantage over a properly tuned CV40. I had an HSR and got rid of it because I didn't see the worth. I'm sure there will be a bunch of members with an opposing opinion and will tell of how much better that the HSR runs. Again just my opinion, If anyone thinks the HSR runs better it is only because they finally took the time to properly tune the HSR and their CV40 was never tuned properly.

I went hsr because it is true pumpless. I know there are lots of folks who dont have a problem with there pumpless cv but there are plenty who do have problems. Around town im sure its fine but im wondering about hualing arse on the freeway.

That and it pops alot less than my cv did.

I have a two bikes. One with stock carb (pumpless w/grizzly valve) and one with HSR. Yes, they "perform" differently.

Mind you, the one with the HSR was installed by Erbman and I can only assumed "tweaked" to it's best performance (including a Yost tube and upgraded ignition). I originally thought of replacing it with a stock carb. But the performance is night and day. Snap response. Fires up instantly. Plenty of power all through the range. Mind you, in a bike with 160,000 miles on it.

For the money, I don't know. But since I have it, it's staying on there. My (unprofessional) opinion.

I have had both and that includes the 42 % 45. They are all good carbs the HSR's are racing carbs so the are performance increases in acceleration. And yes Dave my CV's were properly tuned and would get 50 mpg. My HSR's are properly tuned and will get 48-50 mpg too so that isn't an issue. I prefer the quick response of the HSR and the ease of being able to work on it but I managed to get some ease of maintenance on the CV as well. You still have to pull the tank to change the needle or it's settings but the HSR has 4 needles for tuning. They both have to have the bowl dropped to change the pilot jet,but the main jet is easy without dropping the bowl on the HSR. There are more options in tuning the HSR's so that can be a problem for some who don't like tinkering. In short they all are good if properly tuned so if you don't like to tinker stay with the CV and deal with it. If you like to tinker and have a little more acceleration then maybe you want an HSR.

Warden wrote:
I have a two bikes. One with stock carb (pumpless w/grizzly valve) and one with HSR. Yes, they "perform" differently.

Mind you, the one with the HSR was installed by Erbman and I can only assumed "tweaked" to it's best performance (including a Yost tube and upgraded ignition). I originally thought of replacing it with a stock carb. But the performance is night and day. Snap response. Fires up instantly. Plenty of power all through the range. Mind you, in a bike with 160,000 miles on it.

For the money, I don't know. But since I have it, it's staying on there. My (unprofessional) opinion.

Left out a important part of the picture...Nemesis extended length manifold. I just never did the mod to the manifold for the 42. Gregg (Nemesis owner)told me what to do, but never wrote it down and I forgot what he told me. But there is a way to better match his manifold to that carb.

EVERYTHING! It's just better! I love it and I would do it all over again! I was able to get a great deal on my HSR42 thanks to davej and he really took care of me! My Roadie seems to really respond so much better with the HSR

I'm pretty certain someone posted Dyno charts for a bike running each carb, and the difference was truly negligible. I have the stock CV on both of mine, with no pumps, and have no complaints whatsoever... I have opened up the intakes, the exhausts, ported manifolds, and Dynas in both. Stock carb, jetted according the directions with the kits worked perfectly, and my mpg's are always in the mid-40's around town and upper 40's on the interstate.