|Posted on Tuesday, December 22, 2009 - 10:20 pm: ||
Having some issues with my new 00 buell and the stock carb. gas is pouring out from what looks like the accel pump nozzle and coming out the KN cone intake..
Before i work on this one, is it worth upgrading to the mukuni?
|Posted on Wednesday, December 23, 2009 - 02:19 am: ||
How much gas? Is it continuous? If you twist the throttle it pumps from the accel pump each time. Even little rotations of the throttle. If it's continuously pouring gas then I'd check for a stuck float or debris in the float needle. You might want to take it apart and clean it. Remove the jets and blow out passages. You should be fine with your stock CV-40 they are easy to work on.
|Posted on Wednesday, December 23, 2009 - 03:36 pm: ||
I have had both a modified CV40 and a Mikuni HSR 42 on my M2. Now I am back to the CV 40 and stock muffler.
The CV 40 is a very good carb once it is jetted correctly and the CV is very smooth in operation.
On the other hand, the HSR 42 is more easily tuned and has that immediate throttle response we love about manual slide carbs.
If your bike is stock, or close to stock, I would stay with a rejetted CV 40 but if it is built, the HSR 42, or even a 44 is the way to go.
|Posted on Wednesday, December 23, 2009 - 09:21 pm: ||
Erik - Bottom line is that a Mikuni HSR 42 brings NOTHING to the table under 6000RPM over a properly adjusted CV 40.
The CV 40 is no more difficult to tune than the Mikuni, if you know what you are doing (which is the same case with a Mikuni)!
If you break a cable on a Mikuni you have to figure out what version you have to special order a new one (no one is going to hand one over the counter).
A CV 40 cable can be had by stumbling into any HD dealership and picking up a cable for any bike big twin, sporty or Buell from anything carbureted from 1989 and up to get you through.
Lastly, the Mikuni has a far stiffer throttle spring because it operates a slide on the Mikuni as opposed to a throttle blade in the CV 40.
If you want a bigger carburetor set yourself up with a bigger CV….
(Message edited by rickie_d on December 23, 2009)
|Posted on Friday, December 25, 2009 - 02:43 am: ||
I run the mikuni 42 with no problems mine is built up thow but very happy with it and I'm running the stock thottle cables the choke cable is diffent but easy to find
|Posted on Friday, December 25, 2009 - 01:35 pm: ||
"I'm running the stock trottle cables the choke cable is differnt but easy to find"
That is because you have the last version that does utilize the stock cables; unfortunately Mikuni did manufacture several different models prior that had several different cable brackets. Those models will not accept stock cables!
That aside, the mikuni still does not out perform a tuned CV-40 below 6000RPM.
Not many people will admit that after spending 350 or more bucks and seeing the dyno chart unchanged.}
(Message edited by rickie_d on December 25, 2009)
|Posted on Saturday, December 26, 2009 - 01:05 pm: ||
i upgraded to the mikuni and it was the best thing that i ever put on my m2 shes never rode so smooth i get excatly 50 mpg on the freeway and 33 in city! it was a great investment for me!
|Posted on Sunday, December 27, 2009 - 12:08 am: ||
I will never question my decision to invest in the HSR.
Right out of the box, it ran rings around my CV. Even after the Thunderslide kit.
Keihin Cough? Gone. Throttle response? Instantaneous.
It's not about dyno charts for me. I could care less. It's about practical rideability. And the Mikuni kicks butt. Just my opinion, but it needed saying.
|Posted on Sunday, December 27, 2009 - 03:40 pm: ||
Well, if anyone wants their old CV out of the way, I'll be happy to give them a good home. I've got three tubers that run them, quite happily. Spares are always welcome!
|Posted on Sunday, December 27, 2009 - 04:08 pm: ||
+1 a properly tuned CV works great.
|Posted on Wednesday, December 30, 2009 - 12:03 am: ||
Clean the jets & such, and check your jetting. That should fix you up.
Make sure you have the right idle jet, the stock one is lean, also check the idle screw & see if it's plug has been pulled, and clean it ( and make sure it's there! ) and set it.
If following above link's settings, ignore needle choice advice, the Buell one is better. Also your main jet is bigger than they say, Buell's breath better.
On a stock '00 M2, the CV is fine. The Mikuni is more easily adjusted, but I've had zip problems changing jets etc. even roadside. ( on a CV you do dump the bowl full of gas though...the mikuni is nice! )
Throttle response IS different, but if you have the right idle jet, you don't get the "Keihin Cough".
If you build your bike with ported heads, big cams, I'd go with the Mikuni before the CV44, I hear it's trickier to get right, but don't know, myself.
|Posted on Wednesday, December 30, 2009 - 10:35 am: ||
I have a 2000 M2 with Buell CF intake and Supertrapp muffler. I switched to a 45 slow jet and adjusted the mixture screw to about 2.75 turns out. It worked great however a friend and local HD tech (he also owns two Buells) gave me a slim washer to try under the needle. It seems to have helped the mid range some and I am quite please with it. I get no coughing and plugs read great.
I run it very easy until warm and often run the first couple miles of the day with the enricher slightly out.
|Posted on Thursday, December 31, 2009 - 02:58 pm: ||
Freshen up and jet your CV40 and you will be surprised at how well it can work with a stock, or lightly modified, motor.
I think it is the cheapest and best solution and you will love the smooth power delivery.