| Author | Message | ||
     Dmac |
Have a 2001 Lighting I am converting to carburetor.I have the Daytona ignition.From a performance stand point do you prefer the S&S or the Mikuni? Thanks Dmac | ||
| Ratbuell |
Stock CV. Tune it right and you'll never go back, and you can't swing a dead cat without hitting spare / replacement parts. | ||
| Harleyelf |
But between those two, go with the Mikuni. S&S wants more displacement than we have to be efficient. I use one on my 120 inch monster softtail and I love it; on my S3 the 50s Jaguar SU works best for my riding style, but I's sooner use a Keihen than the S&S. | ||
| Brinnutz |
There is a manifold that Buell had for the race bikes to up the carb to a CV44. That's what I plan to do when I can spare the cash to get the carb. | ||
| Buellistic |
The QUESTION is do you want a carburetor that works in the RPM range that you ride or one that provides the air capacity for RACING ??? A PROPERLY SET UP OEM carburetor is hard to beat !!! | ||
| Sanders |
I have a mikuni works at every RPM range, never had a problem with it. | ||
| Natexlh1000 |
(can I have your old F.I. parts?) | ||
| Dave_02_1200 |
I have used both a Mikuni HSR42 and a reworked CV40 on my M2. Both are excellent but I lean toward the reworked CV40. The CV40 is a very good instrument. | ||
| Firemanjim |
Go with Mikuni if you must change---but why change, FI works great. And remember the carbed bikes use a different timing cup. | ||
| Rex |
Jim, I am thinking of bringing over my M2 to have you and Terry take a look at it, and bring up to shape. it has been a while since I have had an official look at the bike, other than oil change, etc. question on the Mikuni. I have one on my m2. difference from stock. stock would immediately start up and idle correctly all of the time. The mikuni is different. Takes much more choke when starting and must leave on choke for a while, or it will die. But once warmed up it is a different animal. after warm up, it idles faster. If you move the idle up when cold, or the first several miles, , and then the motor wams up, it then idles too high, and must be adjusted down. The stock carb never had this problem? | ||
| Someday |
Rex, Great to see you still have your M2. I remember seeing the article on it in "Battle 2 Win" magazine. Thought you were in Calif? | ||
| Buellistic |
The "IMHO" that the OEM CV Carburetor is the "BEST" is: You can go to your LOCAL HARLEY-DAVIDSON STEALERSHIP and get parts ... Used ones are readily available ... It is easy to tune yourself and "PRODUCT IMPROVE" ... The ENRICHNER(choke) can be adjusted to release as the engine warms up by vibration so so you do not have to be concerned about leaving it on ... The ENRICHNER(choke) can be used in checking you jetting ... "BUT" the main reason is that "i" prefer to "PRODUCT IMPROVE" OEM Parts, "PLUS" you can have the best of both worlds, ie: gas mileage and performance ... | ||
| Dannybuell |
Perhaps the poor M2 mikuni experience is due to the M2's taller gearing. I ran with an thunderslide kitted Kehein for 94,000 miles on my 96s1. I finally broke down and bought a Mikuni 42-11 easy kit. Darn! Easy up front accelerator pump adjustment and all is well. Don't put off for tomorrow what you can do today, you might just like it and do it again tomorrow. | ||
| Buellistic |
DannyBUELL: The ACCELERATOR PUMP was the first thing "i" removed on my "PRODUCT IMPROVEMENTS" on the OEM Kehein 40 MM ... If you can not stay on the cam, you should not be riding a BUELL !!! (Message edited by buellistic on February 16, 2012) | ||
| Rich |
I have a S&S super E on my Buell. I last set the idle on it in 1993, I believe. | ||
| Al_lighton |
Lafayette, I couldn't disagree with you more on this particular issue. My S1W is modded to the hilt, and I still consider the Mikuni to be the single BEST mod that I put on it. At ANY RPM, it has SNAP. I don't care what you do to a CV40, you'll never get it to SNAP like a mikuni. You can certainly GREATLY improve a CV from stock condition, but it won't have the instantaneous response of the Mikuni. Changed from a CV to a Mikuni on my Honda XR400 as well, for all the same reasons. Same result, and even MORE important on a dirtbike. You need that front end to snap up ANY time you wack it in the dirt. Gas mileage....I probably took a hit. Who cares, I don't ride my S1W to save money on gas. I'll get a Prius for that..... To each their own, but I'll never change the mikuni. | ||
| Buellistic |
Al; "Now" if "i" was building a "BIG CUBIC INCH" EVO SPORTSTER engine for my S3 it would get a MIKUNI ... "i" would the SEE THE DYNO RUN SHEETS on a correctly "PRODUCT IMPROVED" Kehein and PROPER TUNED MIKUNI ... As for Snap, a 2 teeth drop on the counter shaft sprocket will do the trick !!! In BUELLing LaFayette | ||
| Harleyms |
my S1W with a HSR42 got 47mpg on the tank I checked last fall, but it was on there when I bought it  | ||
| Firemanjim |
You took off the accelerator pump!!!! That is a step backwards--- and I got 50+ mpg on my 88" S-2 with the Mikuni. Rex sounds like it has a vacuum leak and is running lean, | ||
| Dannybuell |
From right out of the box the Mikuni EZ kit idle mixture was best at 1.5 turns out, the jet might be a bit too big. After a few test runs the idle speed was adjusted. I backed off the accelerator pump a bit too. EZ. | ||
| Radon30 |
I would not go with s&s , I had one on my bike the transition between circuits is not comfortable. My opinion s&s is a good carb. for drag racing, on or off throttle, Stock or mikuni. | ||
| Dave_02_1200 |
Dmac, The choice of carbs depends on what characteristics you are seeking and how you want the bike to respond. In my earlier post I said that I prefer the reworked CV40 on my M2. That is because I ride the M2 on wet mountain roads that are often littered with sand and gravel where log trucks come onto the road, wet leaves, and even green moss where the road is covered by the trees. Under those conditions, smooth "soft" power delivery is the best Rx for riding quickly while staying in control. However, in stock form the CV40 was a bit too soft in its throttle response so I enlarged the vacuum port in the slide to 1/8" to quicken throttle response a bit. Now the throttle response seems about halfway between the "too slow" stock CV40 and the "right now!" hit of the Mikuni HSR 42. If you ride on dry pavement and you want instant throttle response, go with the Mikuni HSR 42 (Easy Kit #4211). If you ride in the wet on slippery road surfaces, the reworked CV40 can be very good. Hope this helps explain how I see the difference between the two. | ||
| Outdoors |
I'm going to try re-working the cv some. My biggest complaint is that it sometimes seems too slow to respond when I come off of the throttle. Almost like the vacuum is retarding the slide's fall. Do you think that enlarging the vacuum port will help. Is 1/8" the recommended size for enlargement? Thanks. My other bike is a '79 T140 Triumph with twin Amal MK II carbs. The mikuni is very similar in design and I find they work great. If a little work on the cv doesn't get me what I want then the easy kit will be next. | ||
| Ft_bstrd |
I like my Mikuni. It is a quick twist compared to the CV, but I tend to be a little heavy on the throttle anyway. | ||
| Radon30 |
Then the s&s would suit you ft b. :-)) | ||
| Dave_02_1200 |
Outdoors, The lag when I closed the throttle on the stock CV40 was annoying. It also seemed a bit slow to respond when accelerating too, it almost felt like I had an elastic band for a throttle cable. Opening the vacuum port to 1/8" made response much better on both acceleration and roll-off. Now throttle response is almost as direct as a cable-operated slide. ps My 1978 Bonneville has Amal MK II carbs with cable-operated slides and they still work great after all these years. They give excellent throttle response, both up and down. (Message edited by Dave 02 1200 on February 18, 2012) | ||
| Buellistic |
Opening up the slide vacuum port helps to get the slide up for more snap, "BUT" no one seems to know about the SCREAMING EAGLE CARBURETOR SLIDE SPRING PN 27728-99 which has 13/210 grams spring tension where the OEM spring has 200/290 grams of spring pressure ... "AND" for even more snap decrease the the counter shaft sprocket by 2 teeth ... | ||
| Kenm123t |
Al how does the Mikuni do with ethanol in the gas on my Cvs I m finding the needle jet tubes holes corrode and even when we clean the parts the holes have closed up a bit and then mixture is erratic as vacuum changes | ||
| Dave_02_1200 |
I have been adding an ounce of Pennzoil full synthetic outboard oil to each tankful and I have not had any problems with either my Mikuni or my CV40. It was intended as a top end lube for valve guides and cylinder bores but maybe it is helping avoid corrosion in the fuel system too. | ||
| Gusm2 |
I much prefer the mikuni to stock cv, as a fuel addative and upper cylinder lubricant I use Castrol R40 ......... Nostalgic aroma too  |
