Plus it idled fine
Out is leaner, in is richer. It's an air bypass into the throat and no fuel actually passes through it. Hence, out = more air (leaner) in = less air (richer).Mikuni manual will tell you how to adjust the mixture:http://www.mikunioz.com/tuning_manuals.htm
no collar, just a round plastic ring at the bottom, does turning out enrich the mixture?
mine has a round plastic ring at the bottom of the needle that fits into the hole the needle seats into.
Wrong! Not for the BS-29. CCW (out) is richer. CW (in) is leaner. It's a gas screw, not an air screw in the BS-29. The Mikuni site you've linked him to does not cover the BS-29 on the AVL engine.
Not really UNDERSTANDING ALL THE CAPS, but I am pretty sure its not an o-ring. its about a 1/4 inch thick, plastic and sits under the notches on the slide needle inside the slide. I am not making this up, there is a plastic ring (plastic not rubber like an o-ring) under the notches on the slide needle that seats inside the slide. There is no disrespect meant in this post, just trying to clarify. I am talking about the inside of the slide, not the screw on the outside of the carb.
Ooops. Yep, wrong carb. Glad I don't have one of those. Threw one from my old Suzuki in the trash.
tooseeveeJust about every carb has it's lovers and haters. Many HD owners think the CV is the bomb. I'm just too wed to Mikuni. I didn't care much for the Carter on my Sportster either! ;-)
1/4 throttle responsiveness. I've had the same issue. Drop the needle one notch richer. That plastic washer will spin and then you can push it anyway you want. It moves once you free it up. Also, our UK brothers have shaved about .7mm off the bottom of the slide allowing a richer condition which may solve the slow to return to idle condition. I'm running a 17.5 pilot, 120 main now , richest notch, about 1/2 turn on the mixture screw.
...........But don't you mean raise the needle a notch richer, not drop the needle a notch richer?Just askin'. Also, could you discuss a little how shaving the bottom of the slide richens the mixture? I can't see it in my head.
Hope the rain stopped. It's beautiful by me and I'm out the door soon to ride!I'm not a slide expert by any means, but Scottie said it. By shaving the bottom our our BS29 slide, we reduce the size of the cutout thereby richening things up. The combo between slide and needle really effect that 1/8 to 1/4 throttle response I believe. I always get by terms mixed up on the needle notches. Scottie's explanation is what I meant to say, but he's done a much better job.
Excellent! Sounds like your very close. I find can't leave mine alone
How many turns out on the mixture screw? How many did you start @?
Thanks, mine is on the bottom notch. Just wanted a reference point.
Looks like I'm going to have to pick up some shims tomorrow...Thanks guys, this thread is great. If I can figure out how to replace the pilot jet in my BS29 I'll be taking mine for its first test drive tomorrow after work.
Thanks for the info and the offer of the diagram- I think I know what I need to do now. I'll try and get the pilot in while it's mounted to the machine, but if I need to move the needle or add shims, I'll have to bring it inside somewhere clean and safe, right?
These tiny little shims are available at any Jap bike dealer with a good stock of Mikuni parts.
CV's are awesome ride a day carbys when set up decently. Very forgiving of seasonal atmosphere and altitude changes and very efficient at atomizing the fuel and mixing it with air. They can be modded for increased performance too.http://www.indiancarsbikes.in/automotive-technology/crisp-punch-ported-throttle-slide-cv-carb-9399/
I've actually done this, and the response from the throttle is noticeable. Not a 'stellar' increase in performance, but responsive is the best word to describe it.I was worried about messing with the only slide I had, so I ended up contacting the author in the article to order an additional slide. If I recall, it cost about 11 USD + about 25 in shipping from India. So I have 2 slides. One thing to note is that I believe as a result of this mod (I say believe, as I changed a whole number of things and cant be certain the slide mod is the root cause), is that my starting procedure really changed. After rejetting, and opening things up, I couldnt start the bike either cold or hot consistently. Before all my mods, I was kicking it easy with just choke. Not so after the mods. It acted like it was missing air. So now, I hold the throttle at about 1/8 open on kicking over (which should be a no-no), and I get zero kick back and 1st kick starts; hot or cold. You may not experience the same thing as each bike has it's own personality. It works for me. Would I do it again? Yes I would... I like the CV carb, but would like a little more performance out of it between 1/8 and 1/2 throttle. When I wack it open, it goes nicely!
Just for my future reference do you recall what size drill bit you used?
If you pull the tank off you can get to the slide and needle without removing the carb. That's my preference. Others find it easier for them to leave the tank in place and remove the carb. Really it's personal choice; 6 of one, half a dozen of the other.