| Author | Message | ||
     Wesbuell |
Can anyone tell me the alternative weaker slide spring, Screamin Eagle p/n 27728-99? Would like to get one locally but can't! Apparently you can even find cv springs at Kwaka dealerships but if I can get a HD part number maybe the dealers could order one in. While I am talking carbs, Aussie washer sizes must be different and I am having no joy finding #4 washers. What are the dimensions of the #4 washers used as shims? | ||
| Rick_a |
The Blast! spring should do the trick. Not sure about the part #. | ||
| Buellistic |
SPRING,slide BLAST(P3) PN 27636-00Y This spring controls how fast the slide opens !!! | ||
| Wesbuell |
Thanks for that, I knew the sun would rise over there sooner or later...haha. So the Blast spring should be weaker than the one on the '98 M2? Then the slide will open faster yeah? | ||
| Buell_bert |
SOOOOO this weaker slide spring makes it open faster/quicker and this causes the engine to rev faster? Why did they not put it in from the factory. A price is always paid somewhere. I would guess fuel economy would be affected. If that is the case I'll keep mine as it is, as it has plenty of power now and I like to go as far as I can on a tank of gas. | ||
| Wesbuell |
Haha - good point, but I am not overly concerned with economy, otherwise I would ride something with 110 cc. Don't mind feedin' the beast a bit more fuel for a bit more performance! Although, to put it into perspective,I have been bangin' out 30,000 miles a year in a jeep for the last ten years, so I am loving my fuel bill on the Buell  | ||
| Rick_a |
I have used the stock CV, the same carb highly modified, an HSR42 and finally an HSR45 Mikuni. Fuel economy did not change at all with any of them. The slide will be more responsive. | ||
| Jayvee |
CV Performance sells one for about ten bucks. I have one in my bike, came with it when I bought the bike, so don't know the difference though. If they won't ship one to you, I will, for cost. | ||
| Wesbuell |
Thanks Jayvee, I will check it out. Managed to find some shims at a kwaka dealer, so the spring is the only thing missing from the setup. | ||
| Outdoors |
On my M2 I notice sometimes that the engine doesn't back off as soon as I would like. Sort of like the vacuum is slowing the slide closing some. I thought about slightly enlarging the slide hole but didn't want to drill it if not required. I actually thought that a stronger spring might slam the slide closed faster?? Short of a mikuni, what is the cure for quicker slide action (opening and closing)? Thanks | ||
| Dave_02_1200 |
I drilled my slide and it improved my throttle response. Simple, cheap, and effective. | ||
| Outdoors |
Dave, I remember you posting the drill method before. What size drill bit should be used and did you stay with the stock spring? | ||
| Dave_02_1200 |
I'll have to look in my notes for the size of the drill bit I used to open the hole in the slide. Also. I shortened the stock spring a bit for quicker initial response. Now my CV40 provides instant response and still maintains the easy-to-control, smooth power delivery that CV40s are known for. | ||
| Wesbuell |
Buellistic recommended the blast spring, so I am getting one to try. I drilled the vaccy hole to 3mm, giving me what I hope is the perfect balance between my greed wanting the 1/8 hole, and my fear of lack of effectiveness from a 7/64 hole, haha. Don't know if it has made a difference as while rejetting and changing intake seals I found some fraying of the throttle cable where it comes out of the bracket mounted on the carb! Being an amateur genius, I pulled the cable through a bit and trimmed off the fraying strands, unfortunately this enabled the cut pieces to catch on the sheath when it returned, completely stuffing it!!! It looks to me like it was cut by rubbing on exit from the mount, so I will try to make the cable entry more upright when installing the new one???? On the good side of the ledger, whilst I cannot tune the carb yet, the bike starts with no choke now! Could be that I am slowly winning. Just on the performance greed factor, I had to do the jets twice, as I tried a 48 and a 200, the 48 was too much jet with the accelerator pump still connected methinks. | ||
| Jayvee |
If it starts from cold with no choke at all, wouldn't that mean too rich? Also, I'd be curious if anybody has measured the wire diameter of the Blast spring. The CP spring is like .020 thinner than the factory, is why I ask. Wondering if the Blast is similar. (Message edited by jayvee on August 27, 2013) | ||
| Wesbuell |
Thanks for confusing the issue Jayvee, hehe. I might wait for some feedback before ordering the blast, (blasted?), spring, Al can send me one but if it is no good there is no point as the cv spring apparently works. If I don't go with the blast spring and cv won't send me one I may need to take you up on your offer. I think the carb was quite rich with the 48, but haven't really bothered testing it with the 45 while I wait for my throttle cable. It was a warm day, and I may have had the idle set a little high, so hopefully it isn't too rich. Keep copping sunny days while I wait for parts - awesome.  Still, gave me time to rebuild front caliper, that should stop the scraping noise/brake drag. I will let you know how it goes in a few days when the cable turns up, because I want the carb tuned and out of the way so I can install my new shock and RIDE...pretty sure that's what I have the bike for????? | ||
| Jayvee |
Back to the original question as far as the Screamin' Eagle spring vs. a Blast spring... The Screamin Eagle should be available (if not in stock) from any H-D dealer, and looks to accomplish what you want for $3. (The CP spring is $10.) The Blast spring purportedly does the same thing, but not readily available (don't know how much $) + shipping. Why not try the S. E. first? By the way, my jets are 44 slow, 195 high, and use the old Sportster XLH needle ( unshimmed.) Turns out my spring came already the 'weaker' spring, that's why I have a spare CP spring. I also followed Buellistics example, and smoothed the front edge of the slide bottom; also smoothed the slide wings (sides going up and down in the channels.) Also smoothed out the accelerator pumper post, ala Dakota Kid. | ||
| Wesbuell |
Alright, now I'm fascinated, haven't heard of smoothing the slide wings or acc. pumper post, more info please, (if ya don't mind?). Did the slide bottom, happy to keep going. Haha I was under the impression, and Al at American Sport Bike confirmed it, that the S/E spring was no more? Would love to get a couple if they still exist. That is one nice lookin' yellow beasty you have there Jayvee. | ||
| Jayvee |
Yeah, I find a lot of discussion about using this S. E. part number spring, but no one seems to have them anymore. Also, seems to be the one used on a CV44 carb too. Here's a discussion on jetting from about a year ago, scroll down for picture: http://www.badweatherbikers.com/buell/messages/476 23/692297.html Here's the ad for CVP nozzle, not just smoothed out, it omits the upper skinny portion of it altogether: https://store-debc0.mybigcommerce.com/accelerator- pump-nozzle/ Here's the Dakota Kid carb picture: http://www.baggersmag.com/tech/0207hrb_hot_cv_carb uretors/photo_03.html#photo_03.html?&_suid=1378234 8009390524019781437713 | ||
| Mr_grumpy |
I drilled the slide hole to 3mm many years back but the thing that made the most improvement to the Keihin was cropping a couple of coils off the slide spring. | ||
| Wesbuell |
Wow...finally two people who have done it, posted it, and not been castigated in the thread...Bahahahahahahaha. Just kidding, I have only heard and read criticism of this method from people who haven't tried it, good to hear some real feedback. I looked at doing mine but have no baseline, so don't know if the PO has messed with it. If I knew the original length I would have a crack, as I can always get another spring. Bit of an update, I think the 45 is ok now that I have replaced the throttle cable. The throttle couldn't return fully, hence the easy start without choke!!!! The 200 is no problem, I am actually wondering if it is a little lean, as when I am doing 80 to 100 in 4th or 5th gear and I open the throttle all the way up it doesn't respond when I let it off 1/8 to 1/4. It actually seems to continue accelerating a little, which indicates that it may be lean, IIRC? I also slapped two 22 thou shims under the needle. Pulled hard, butt when cruising in the midrange it was 'puffing'? Every so often, like missing a beat or coughing, (hard to describe). I have taken one shim out and will see how it goes tomorrow. Waiting for parts is great for the bike, calipers rebuilt, new pads, electrical problems chased, Penske installed, etc, etc. BTW, thanks everyone for the input, it is excellent.  | ||
| Jayvee |
I was wrong, I use the 42 main jet. Joe Minton wrote extensively on jetting, and suggests the stock slow jets, but the different needle. Got the needle from Walnut Creek H-D, tried it 200 Main, but went down to 195. Slow is 42. I never go full throttle anyway, but that's a different problem. |
