Lets argue carbs
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Around here you can get a dyno run done for $50.
No tuning just the run.
If you have them tune it then it is $200.
No tuning just the run.
If you have them tune it then it is $200.
Club Member
Joined: Aug 2008
Posts: 22,857
Likes: 17,908
From: Lafayette, Louisiana
I've never had my bike dyno'd after the engine work a couple of years ago. It's more of a curiosity thing. It runs so good and pushes me back in the seat when I twist the throttle. Probably not making big numbers, but on the other hand, it might be interesting to see what the torque curve looks like.
Seasoned HDF Member
Joined: Jun 2010
Posts: 9,332
Likes: 3,873
From: Upstate New York
I've run both the CV and the Mikuni HSR42 on my bike and been very happy with both. Truth to tell, I'd still be running the CV if I'd not been persuaded to try the HSR42 on my first rebuilt motor in a vain attempt to improve cold starting (not the fault of either carb, but a serious internal problem with the first rebuilt motor-but that's another story).
For my nearly stock motor, the Mikuni was jetted a bit rich from the factory, and the accelerator pump settings are a bit off. The "mileage kit" improved things considerably. This kit consists of a number 50 accelerator pump nozzle (stock is 70), a 17.5 pilot jet (stock is 25), a leaner 98 needle (stock is 97) and a 165 main jet. I installed the parts, set the accelerator pump rod to "zero" gap per the instructions and that was it. I ended up going up to a #20 pilot jet to improve cold weather riding under trailing throttle. Mileage before the kit was 38-42 MPG. With this kit, I get 43-48 normally and can pull 50 MPG if I'm sparing with the throttle (hard to do, as this setup has such nice response). This setup works with my bike, but as they say, YMMV.
I have no first hand experience with the S&S to add to this discussion.
For my nearly stock motor, the Mikuni was jetted a bit rich from the factory, and the accelerator pump settings are a bit off. The "mileage kit" improved things considerably. This kit consists of a number 50 accelerator pump nozzle (stock is 70), a 17.5 pilot jet (stock is 25), a leaner 98 needle (stock is 97) and a 165 main jet. I installed the parts, set the accelerator pump rod to "zero" gap per the instructions and that was it. I ended up going up to a #20 pilot jet to improve cold weather riding under trailing throttle. Mileage before the kit was 38-42 MPG. With this kit, I get 43-48 normally and can pull 50 MPG if I'm sparing with the throttle (hard to do, as this setup has such nice response). This setup works with my bike, but as they say, YMMV.
I have no first hand experience with the S&S to add to this discussion.
Cruiser
Joined: Feb 2014
Posts: 129
Likes: 11
From: NPR, FL
My bike had the RS42 on it when I got it. It was running rich and getting crappy mileage so I lowered the needle 1 clip and that brought it up into the low to mid 40's. Not flat spots, no hesitation. Its a very smooth running carb. I also added the adapter so I could hook the cruise control back up.
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