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I recently aquired a HSR 42 carb and am trying to decide if I should install it or not. I've read some places that a properly tuned CV carb can make almost the same numbers as a HSR carb. I've read others that the Mikuni makes a huge difference.
I am running an SE aircleaner and will either go to slip-ons or a full exhaust. Also how hard is it to tune the Mikuni?
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What is the bike and what other modes do you have besides seac and pipes in the future?
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Where ever you go there you are
02 FLHTCUI
SE 103 Tmax
SE AC SEII Slip-ons
TW6H W/4 Deg. off set gear
04 FXSTDSE2
V&H Pro Pipe Standard Baffle
For me, I ride a dyna and when It was stock with SE mufflers and then VH short shots with AN big sucker air cleaner I added the Mikuni 42, the bike made NO extra power and had a overly FAT midrange even after some tuning.
Later on after the HQ big bore kit with cams and head work the Mikuni realy started to shine, I added one other thing to the carb, the HQ Mikuni tuning kit for like 20$, this kit made the overly rich off idle and mid range go away!
Now i can tune pretty much just with the main jet and the occational needle settings.
Doug at HQ runs the CV exclusively from what ive heard and has been using the BIG CVs
with great sucsess. This is with just jetting, no funky Dyno jet kits or other "gimmiks".
so, sometimes it boils down to $$$ and what your comfortable with working on or tunning with.
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95 Sport/touring HQ big bore kit
.575 Firestorm cams
D&D fat cat
Mikuni 42 mm
magnecor spark cables
Last edited by new_mentor70; 12-09-2008 at 08:37 PM.
Big thing about the Mikuni is the much improved throttle response compared to the CV. The slide is connected directly to the throttle cable...no vacuum diaphram like the CV. The Mikuni is easy to work on, but there are a lot of things to tweak. Pilot jet, main jet, needle size, needle clip, accelerator pump nozzle, 2 accelerator pump adjustments, idle mixture. Mikuni has an excellent tuning manual on their website you can download, tells you how to dial it in fairly easy. A lot of folks end up with a 17.5 or 20 pilot jet, 98 needle with the clip in the middle, 165 main jet, 50 pump nozzle and the accelerator pump adjusted per the manual.
Downside is the slide rattles...a lot. Even more if you have cams with more overlap than stock.
Mikuni vs. CV Carb
