After-market Carbs.
#1
04-07-2008, 08:44 AM
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#2
04-07-2008, 08:47 AM
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#3
04-07-2008, 09:19 AM
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#4
04-07-2008, 09:30 AM
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RE: After-market Carbs.
The CV-40 that came standard on the evo Sportsters is more than adequate for applications up to 100HP with proper tuning. I have mine tuned with the Yost kit changing the needle, spring, enlarging the vacuum port in the slide to 1/8", Yostemulsion tube, 45 pilot, 185 main jets. I run a Forcewinder and Samson pipes.
I get great performance as well as quick throttle response. The mikuni HSR-42is a nice carb and will perform well but for stock applications doesn't produce much more than 1-2 HP over what a properly tuned CV-40 will make.
For noticable power gains you may wanna look into a set of andrews cams or something similar, and if you really wanna get nutty, a setof buell thunderstorm heads and pistons along with those cams will get you in the really nutty range. [8D]
I get great performance as well as quick throttle response. The mikuni HSR-42is a nice carb and will perform well but for stock applications doesn't produce much more than 1-2 HP over what a properly tuned CV-40 will make.
For noticable power gains you may wanna look into a set of andrews cams or something similar, and if you really wanna get nutty, a setof buell thunderstorm heads and pistons along with those cams will get you in the really nutty range. [8D]
#5
04-07-2008, 09:32 AM
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#6
04-07-2008, 09:57 AM
RE: After-market Carbs.
ORIGINAL: Biker Trash
The CV-40 that came standard on the evo Sportsters is more than adequate for applications up to 100HP with proper tuning. I have mine tuned with the Yost kit changing the needle, spring, enlarging the vacuum port in the slide to 1/8", Yostemulsion tube, 45 pilot, 185 main jets. I run a Forcewinder and Samson pipes.
I get great performance as well as quick throttle response. The mikuni HSR-42is a nice carb and will perform well but for stock applications doesn't produce much more than 1-2 HP over what a properly tuned CV-40 will make.
For noticable power gains you may wanna look into a set of andrews cams or something similar, and if you really wanna get nutty, a setof buell thunderstorm heads and pistons along with those cams will get you in the really nutty range. [8D]
The CV-40 that came standard on the evo Sportsters is more than adequate for applications up to 100HP with proper tuning. I have mine tuned with the Yost kit changing the needle, spring, enlarging the vacuum port in the slide to 1/8", Yostemulsion tube, 45 pilot, 185 main jets. I run a Forcewinder and Samson pipes.
I get great performance as well as quick throttle response. The mikuni HSR-42is a nice carb and will perform well but for stock applications doesn't produce much more than 1-2 HP over what a properly tuned CV-40 will make.
For noticable power gains you may wanna look into a set of andrews cams or something similar, and if you really wanna get nutty, a setof buell thunderstorm heads and pistons along with those cams will get you in the really nutty range. [8D]
#7
04-07-2008, 10:08 AM
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RE: After-market Carbs.
Biker Trash, sounds like that might work for me I just want a little quicker response. I'll look into the Yost Kit is it like a Thunderslide Kit?
Mine has been tuned on the dyno and runs great. Just looking for more off the line.
My next overhaul will include Buell Heads.
Mine has been tuned on the dyno and runs great. Just looking for more off the line.
My next overhaul will include Buell Heads.
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#8
04-07-2008, 10:15 AM
Road Master
RE: After-market Carbs.
I put the Mikuni 42 on my bike and left it on for about a week. They are not easy to tune, at least in my opinion. Maybe with a stock bike but not mine. We had it on the dyno for like 3 hours before I said no mas. My dyno results were less than with the CV with the right jets and Thunderslide kit. There was some better response but not real noticeable in my case. My results are somewhat skewed because my bike is somewhat heavily modified.
I've seen posts where shops have given people estimates as high as 12 hours to dyno tune a Mikuni. That's ridiculous I know but it does give some credibility to the potential difficulties involved. If you want one, Eastern Performance is definitely the place to buy it.
I've seen posts where shops have given people estimates as high as 12 hours to dyno tune a Mikuni. That's ridiculous I know but it does give some credibility to the potential difficulties involved. If you want one, Eastern Performance is definitely the place to buy it.
#9
04-07-2008, 10:34 AM
Outstanding HDF Member
RE: After-market Carbs.
ORIGINAL: tgarrett1
Biker Trash, sounds like that might work for me I just want a little quicker response. I'll look into the Yost Kit is it like a Thunderslide Kit?
Mine has been tuned on the dyno and runs great. Just looking for more off the line.
My next overhaul will include Buell Heads.
Biker Trash, sounds like that might work for me I just want a little quicker response. I'll look into the Yost Kit is it like a Thunderslide Kit?
Mine has been tuned on the dyno and runs great. Just looking for more off the line.
My next overhaul will include Buell Heads.
Where I live is around 700 ft above sea level and my set up is good forbelow 1000 ft abovesea level.
The Yost CV-40 Master kit retails for around$110 but americanclassicmotorson ebay has it for $89with free shipping. http://cgi.ebay.com/ebaymotors/CV-40...spagenameZWD1V
Edit: heres a couple of links thatI viewed before purchasing my kit...
http://www.mklsportster.com/xlyost.htm
http://www.mklsportster.com/xlyost.htm
http://www.americanthunderbike.org/p...views/yost.php
#10
04-07-2008, 01:21 PM
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RE: After-market Carbs.
Just a note on the thunderslide kit...
There was one installed on my bike when I bought it used...
After installing the Yost tube, I found the composite slide a little too "reactive" with the yost spring, and switched back to the stock one (stiffer)
After reading about the thunderslide, I personally wouldn't have swapped for the composite slide.Since it was already in the carb...I just worked around it.
Definately recommend the Yost kit though..very tunable...
Rick C.
There was one installed on my bike when I bought it used...
After installing the Yost tube, I found the composite slide a little too "reactive" with the yost spring, and switched back to the stock one (stiffer)
After reading about the thunderslide, I personally wouldn't have swapped for the composite slide.Since it was already in the carb...I just worked around it.
Definately recommend the Yost kit though..very tunable...
Rick C.