cv carb mod
#1
cv carb mod
Hey all:
I got a few questions about CV carb mods. My present carb on a 1991 FLHTC is a S&S super E carb with stock jets. Just had it rebuilt by a good carb guy. While it runs well after warm up it gets bad fuel mileage and you can smell raw gas(lots) in the exhaust. Soooooooo i read up and see you can do some mods on a stock CV (which I got) to make em real good for a relatively stock bike(stage 1 mufflers and ev27 cams). Sooooo...i go to E-bay and see a guy selling modified CV's. Says he'll get you rolling for bout 180 bucks if you trade in your old carb. Fully modified CV job?
1. Anybody done this?
2. Anybody heard of this?
3.Anybody local to this forum who does it?
Thanks WallyBally
I got a few questions about CV carb mods. My present carb on a 1991 FLHTC is a S&S super E carb with stock jets. Just had it rebuilt by a good carb guy. While it runs well after warm up it gets bad fuel mileage and you can smell raw gas(lots) in the exhaust. Soooooooo i read up and see you can do some mods on a stock CV (which I got) to make em real good for a relatively stock bike(stage 1 mufflers and ev27 cams). Sooooo...i go to E-bay and see a guy selling modified CV's. Says he'll get you rolling for bout 180 bucks if you trade in your old carb. Fully modified CV job?
1. Anybody done this?
2. Anybody heard of this?
3.Anybody local to this forum who does it?
Thanks WallyBally
#2
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RE: cv carb mod
ORIGINAL: wallybally
Hey all:
I got a few questions about CV carb mods. My present carb on a 1991 FLHTC is a S&S super E carb with stock jets. Just had it rebuilt by a good carb guy. While it runs well after warm up it gets bad fuel mileage and you can smell raw gas(lots) in the exhaust. Soooooooo i read up and see you can do some mods on a stock CV (which I got) to make em real good for a relatively stock bike(stage 1 mufflers and ev27 cams). Sooooo...i go to E-bay and see a guy selling modified CV's. Says he'll get you rolling for bout 180 bucks if you trade in your old carb. Fully modified CV job?
1. Anybody done this?
2. Anybody heard of this?
3.Anybody local to this forum who does it?
Thanks WallyBally
Hey all:
I got a few questions about CV carb mods. My present carb on a 1991 FLHTC is a S&S super E carb with stock jets. Just had it rebuilt by a good carb guy. While it runs well after warm up it gets bad fuel mileage and you can smell raw gas(lots) in the exhaust. Soooooooo i read up and see you can do some mods on a stock CV (which I got) to make em real good for a relatively stock bike(stage 1 mufflers and ev27 cams). Sooooo...i go to E-bay and see a guy selling modified CV's. Says he'll get you rolling for bout 180 bucks if you trade in your old carb. Fully modified CV job?
1. Anybody done this?
2. Anybody heard of this?
3.Anybody local to this forum who does it?
Thanks WallyBally
#3
RE: cv carb mod
ORIGINAL: wallybally
Hey all:
I got a few questions about CV carb mods. My present carb on a 1991 FLHTC is a S&S super E carb with stock jets. Just had it rebuilt by a good carb guy. While it runs well after warm up it gets bad fuel mileage and you can smell raw gas(lots) in the exhaust. Soooooooo i read up and see you can do some mods on a stock CV (which I got) to make em real good for a relatively stock bike(stage 1 mufflers and ev27 cams). Sooooo...i go to E-bay and see a guy selling modified CV's. Says he'll get you rolling for bout 180 bucks if you trade in your old carb. Fully modified CV job?
1. Anybody done this?
2. Anybody heard of this?
3.Anybody local to this forum who does it?
Thanks WallyBally
Hey all:
I got a few questions about CV carb mods. My present carb on a 1991 FLHTC is a S&S super E carb with stock jets. Just had it rebuilt by a good carb guy. While it runs well after warm up it gets bad fuel mileage and you can smell raw gas(lots) in the exhaust. Soooooooo i read up and see you can do some mods on a stock CV (which I got) to make em real good for a relatively stock bike(stage 1 mufflers and ev27 cams). Sooooo...i go to E-bay and see a guy selling modified CV's. Says he'll get you rolling for bout 180 bucks if you trade in your old carb. Fully modified CV job?
1. Anybody done this?
2. Anybody heard of this?
3.Anybody local to this forum who does it?
Thanks WallyBally
The S&S E carb is a very basic but agressive fuel delivery system. Been running a "G" onmy Evo since 94 and requires constant attention based on barometric pressure, ambient temp and elevation.
On the other hand the CV carb is superior and a darn good carb. Word of caution, purchased a new one and modify it yourself by picking up a jet kit. It's as simple as making toast.
GL Wallybally
#4
RE: cv carb mod
Don't know much about the super E carbs , but here's a link for basic settings.
http://www.nightrider.com/biketech/h...&S_jetting.htm
I personally like the stock CV carbs and run one on mine.
The CV can give you what you want and get good mileage in the process.
My mods are in my sig at the bottom , cost was about $20.00 for ,pilot jet , main jet , and needle.
I think the stock carb can't be beat for what you intend to accomplish.
Good luck , and let us know how/what you did to solve your problem.
I got most of my tuning ideas from the DIY section and careful observation of mileage and plug color.
Mick
http://www.nightrider.com/biketech/h...&S_jetting.htm
I personally like the stock CV carbs and run one on mine.
The CV can give you what you want and get good mileage in the process.
My mods are in my sig at the bottom , cost was about $20.00 for ,pilot jet , main jet , and needle.
I think the stock carb can't be beat for what you intend to accomplish.
Good luck , and let us know how/what you did to solve your problem.
I got most of my tuning ideas from the DIY section and careful observation of mileage and plug color.
Mick
#5
RE: cv carb mod
I think you'll be satisfied with a properly jetted stock 40 m.m. C.V. Back in the early 70's everyone was looking for a better carb for Harleys. S&S offered the "B" with no accelerator pump, guys modded Tollotsons, Harley offered the Bendix, old style Mikunis from Branch. I liked S.U.s off Jaguars. They were the only carb I could get to be smooth and clean running with no flat spots or burbles at any rpm. They were a vacuum slide carb with a hugh shiny dome on top. When Harley first offered the C.V. I was amazed, this is an updated S.U. vacuum slide carb. I think they're a great carb, better than an S&S for mild motors. Mikuni HSRs are my favorite now.
#6
RE: cv carb mod
I've had several different carbs on my RK over the past four years. First the original CV and then I went to the S&S Supper E, then Back to the CV then I got board and bought a new Mikuni 42 it was ok. But I ended up going back to the CV a couple weeks ago becuase I couldn't ever get my bike to run as good as I could with the CV. I know the Mikuni is a great carb but I had better luck tunning the CV. I could rejet theCV in the dark on the side of the road if I had to. The S&S was ok if I was drag racing WFO throttle all the time. There again I'm not the greatest carb tunner with the S&S either. SoI'd pick the CV over all of them. Good luck....
#7
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#8
RE: cv carb mod
Thanks for the advice and tuning tips. The accelerator pump was wayyy off. I did it to the spec sheet but it was pumping tons of fuel into the bike. Fixed it..I hope).
I set the idle mix just a quarter turn out of the lean side. Seems better too. It was a full turn and a half rich from that setting before.
Im gonna do the CV mod myself. Found a link off Yahoo for "CV mods". I'll do a rebuild while im there of course. Looks simple ...course so does brain surgery..
WallyBally
I set the idle mix just a quarter turn out of the lean side. Seems better too. It was a full turn and a half rich from that setting before.
Im gonna do the CV mod myself. Found a link off Yahoo for "CV mods". I'll do a rebuild while im there of course. Looks simple ...course so does brain surgery..
WallyBally
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