|
SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Idle Mixture Screw /cgi-bin/YaBB.pl?num=1116902127 Message started by bobo383 on 05/23/05 at 19:35:27 |
|
Title: Idle Mixture Screw Post by bobo383 on 05/23/05 at 19:35:27 It's behind a little plug on the right side of the carb. I've already drilled the plug out, but here's the location: http://i4.photobucket.com/albums/y114/bobo383/IdleMixture.jpg If any of you are handwriting analysts, please keep quiet. Oh, I guess you could tell that already... |
|
Title: Re: Idle Mixture Screw Post by klx650sm2002 on 05/24/05 at 02:43:49 I like to set the tickover a little rich, it gives a more consistant idle speed as the engine warms up. Clive W :D |
|
Title: Re: Idle Mixture Screw Post by gazab44 on 05/24/05 at 05:33:57 Is it just for idle speed or does it affect anything else? |
|
Title: Re: Idle Mixture Screw Post by Reelthing on 05/24/05 at 05:48:04 There's a diagram around here some place that shows about where the different fuel paths kick in - and the Idle Mixture goes fairly far up the throttle - high effect at least to 1/4 maybe 1/3 throttle - I'll look for the picture |
|
Title: Re: Idle Mixture Screw Post by Reelthing on 05/24/05 at 05:50:36 Here it is ... http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1104205157 |
|
Title: Re: Idle Mixture Screw Post by klx650sm2002 on 05/24/05 at 07:00:56 That diagram is for slide carbs and also holds true for the slide movement of a cv carb. Only with a cv carb the slide position is not directly related to the twistgrip. Clive W :D |
|
Title: Re: Idle Mixture Screw Post by Reelthing on 05/24/05 at 07:10:57 As Bobo pointed out the hardwired carbs are a lot more to punch, you get a moment of bog if it's rich enough and then bang - do they actually run much better than a vac operated - I doubt it - but more fun - anyway - don't you think the idle mixture carries up about the same place 1/4-1/3 on a CV vac carb - maybe even longer as the "lazy" vac slide takes it's sweet time to pull the needle out |
|
Title: Re: Idle Mixture Screw Post by Love2Ride on 05/24/05 at 07:29:02 gazab44 wrote:
This one is the idle fuel/air mixture. Idle speed is a thumbscrew on the left side of the carb. |
|
Title: Re: Idle Mixture Screw Post by Reelthing on 05/24/05 at 07:34:28 Good point - this not for the idle RPMs - that is thumb screws job |
|
Title: Re: Idle Mixture Screw Post by klx650sm2002 on 05/24/05 at 07:42:13 I found a big gain in performance when i went from a keihin CVK40 (with dynojet kit) to a keihin FCR41 and no bogging low down. Clive W :D |
|
Title: Re: Idle Mixture Screw Post by Reelthing on 05/24/05 at 08:05:00 I may have to give one a go - on the bog stuff - if you can truely jerk the venture wide open the air out runs the fuel a brief moment and you get that kick when it catches up - now the accelerator pumps job is to smooth this out - d@mn I need one to fool with! |
|
Title: Re: Idle Mixture Screw Post by Love2Ride on 05/24/05 at 08:26:04 If I get one, I really want to get one that has the vacuum port on it. I've found I actually like the way the petc0ck operates. |
|
Title: Re: Idle Mixture Screw Post by Reelthing on 05/24/05 at 08:39:46 On order... bet we can add a vac take off - got a vac guage around here some place - just need to measure how much we need |
|
Title: Re: Idle Mixture Screw Post by bobo383 on 05/28/05 at 08:38:50 Reelthing wrote:
No need to measure the vac, it's the pressure between the engine and the throttle (blades on stock carb, slide on the amal). You may have to drill and tap to put a fitting in there, forward of the slide in the neck of the carb... No big deal. |
|
Title: Re: Idle Mixture Screw Post by Oklahoma_Mike on 09/19/05 at 10:47:17 We didn't note which way does what. Right to Rich (CW) Left to Lean (CCW) Is that correct? 8) |
|
Title: Re: Idle Mixture Screw Post by Savage_Rob on 09/19/05 at 11:37:33 I believe CCW makes the mixture richer while CW leans it. |
|
Title: Re: Idle Mixture Screw Post by Oklahoma_Mike on 09/19/05 at 12:13:44 Oklahoma_Mike wrote:
after further research I believe you are right R to L and L to R or Right to Lean (CW) Left to Rich (CCW) |
|
Title: Re: Idle Mixture Screw Post by texsam on 04/15/09 at 16:06:14 i got a quick question i adjusted my idle mixture screw it solved most backfiring issues screwed screw in cw all the way and turned 2.5 times out ccw but now my muffler wich is stock is whistling a tad should i be concerned about back pressure, compression ect.?? just bought 06 s40 and luvin it!!!!great bike |
|
Title: Re: Idle Mixture Screw Post by verslagen1 on 04/15/09 at 18:46:49 Your bike must be happy to whistle. I changes the muf to a supertrapp and it just growls all the time. |
|
Title: Re: Idle Mixture Screw Post by texsam on 04/16/09 at 11:02:12 cool just didn't know thanx for the advise |
|
Title: Re: Idle Mixture Screw Post by PTRider on 04/16/09 at 11:27:44 Look for something else causing the whistle. Coincidences happen. An aftermarket muffler will likely be louder, and may offer more power at wide open throttle...or may not, and may cause a power loss. For more about properly designing exhaust and intake systems, the best work I know of is Scientific Design of Exhaust and Intake Systems by Smith and Morrison. It is old, but the principles remain valid. http://www.bentleypublishers.com/automotive-engineering/Scientific-Design-Exhaust-and-Intake-Systems.html A local public library can probably get this book, perhaps by an interlibrary loan. |
|
Title: Re: Idle Mixture Screw Post by texsam on 04/17/09 at 17:51:37 thanx ptrider, i gotta question when the engine hasn't been ran for a while and is dead cold it stumbles rite after starting for a sec or 2,does that mean i have the a little mixture screw to rich?????this is in the mourning like 4 am temp bout 65 - 70 degrees, choke also makes it worse so thats why i'm thinkin to rich........................................ 8-) 8-) 8-) 8-) 8-) 8-) 8-) later on guys |
|
Title: Re: Idle Mixture Screw Post by texsam on 04/26/09 at 17:28:11 i've set my screw at 3 and 1/8 turns is that to far???it seems to work good less backfire??good starts. |
|
Title: Re: Idle Mixture Screw Post by sakara on 04/29/09 at 09:08:54 yeah, usually anything over 3 turns out is too far and you should jet up. There's so many jet/carb posts, you;ll find all the info there and then some. |
|
Title: Re: Idle Mixture Screw Post by texsam on 05/15/09 at 16:31:51 where can i find a larger pilot jet i have 52.5 and it runs best 3 1/4 turns out so i think i need to go 1 size up but i don't know where to look i have an 06 s40 |
|
Title: Re: Idle Mixture Screw Post by Duane on 05/15/09 at 21:04:20 64564156505268655855370 wrote:
I agree |
|
Title: Re: Idle Mixture Screw Post by LANCER on 05/16/09 at 05:07:50 5571767B7275777B455773717F1A0 wrote:
after further research I believe you are right R to L and L to R or Right to Lean (CW) Left to Rich (CCW) [/quote] Yep, correct info for the stock BS40 carb |
|
Title: Re: Idle Mixture Screw Post by LANCER on 05/16/09 at 05:33:13 26393A363E3D342721550 wrote:
Your local dealer should have them available. If not then beat them thouroughly about the head and shoulders, then politely apologize for the slight over reaction to their lack of customer support and then let your fingers do the walking through the yellow pages to see if another local independent shop has a jet assortment. If not available locally then go online; their are many parts suppliers listed in this tech section. I am away from home and will not be back for 2 weeks or so, otherwise I would just send you one. Keep after it, someone has one. **There is one other possible option depending on how far you are willing to go. If you have a set of the tiny diamond files, usually 8-10 of assorted shapes included, can be had for very low $ at Harbor Freight or Northern Tool stores; one of the files in the set is round and very pointed and the tip of that file may be used to open the brass pilot jet hole. It must be done gently and carefully lest you open it too far and find yourself in a too rich situation. The brass is soft and files off very easily, so when inserting the point of the file into the end of the jet you just very lightly turn/twist the file with the fingers back and forth a couple of times; just enough to remove a hair of metal. Install jet back in carb and test run & readjust the pilot screw. (If you do this you might as well reset the pilot screw back to a 1.5 turn out position to give you a new starting point). I find it a fun thing to do, just don't file the first time so much that you can really see metal on the point of the file, because if you can easily see the brass on the file the first time then you have likely gone too far already... I know about that one. The first time I tried it I think I went up 2 or 3 jet sizes, but I was much to heavy handed and had turned the file probably 8-10 times until I could actually see that the hole was bigger. That was a mistake. Working gently and lightly will avoid that. It is much better to go by touch, you can feel the file contact the brass hole and a couple of gentle turns is enough for each test step. It is fun stuff. |
|
Title: Re: Idle Mixture Screw Post by texsam on 05/16/09 at 11:49:59 thank you i'll take a look see what i'll do i might do that file thing you just said thats a good idea |
|
Title: Re: Idle Mixture Screw Post by texsam on 05/16/09 at 14:17:06 let me ask one more question,when i bought the bike the brass plug was already removed and from day one i never needed to use choke not even when it's 45 - 50 degrees outside and the bike is dead cold when i adjusted the screw i tested it and it came out to 3 1/4 turns on the mixture screw best idle performance ect. then i turned it in to just 3 turns and it requires a little choke even in 80 degree weather sois that weiird to not use choke in those conditions (to rich) or is it weird to use a little choke 80 degree weather these are only on cold starts i mean dead cold starts |
|
Title: Re: Idle Mixture Screw Post by texsam on 05/18/09 at 14:22:54 when you install the diaphragm lockplate for white spacer mod the dimple ffaces down????? correct |
|
Title: Re: Idle Mixture Screw Post by PTRider on 05/18/09 at 18:49:43 3F20232F27242D3E384C0 wrote:
Correct. |
|
Title: Re: Idle Mixture Screw Post by texsam on 05/19/09 at 02:58:07 thank you |
|
Title: Re: Idle Mixture Screw Post by kickstartmyheart on 05/19/09 at 08:05:28 i have one thing to add... when you are preparing to drill out the brass piece of junk covering the air screw have some deep creep and gasket remover on hand... you will have to clean the threads very carefully because you screw has been lock-tite'ed in place... its very tempting to unscrew the thing and strip out those delicate threads and try to order a new brass air screw online but if you have ever ordered carb parts online its anything but easy... also... when you figure out that the idle jet is 52.5 you can get a micrometer and some tiny little drill bits and drill it out instead of searching for a larger jet online... heres what i did... first you you get your jet and try fitting a drill bit down the hole till one fits snug... measure it.. should be about .50mm . next find a bit thats around .55, .57mmdrill your jet carefully.. clean, replace, test. i found .58 to be the lucky number... no more backfiring on the highways... |
|
Title: Re: Idle Mixture Screw Post by andyr on 05/19/09 at 09:42:33 On my 2005 S40, modified by the previous original owner with a gutted Harley type muffler, pod style air filter and a Dynojet (?) kit, turning the mixture screw full to the right (CW) actually INCREASED the idle speed. This caused poor cold and low-end performance though with much backfiring. I went 2 turns CCW and this decreased the idle speed but the bike ran better with less backfiring. I'm relating this story because the idle speed issue confused me quite a bit since it was counter intuitive. - Andy R. |
|
Title: Re: Idle Mixture Screw Post by LANCER on 05/19/09 at 13:25:44 252C3A3D2C3B2D2C273D490 wrote:
I maty, strange things can happen when a tiny passageway or two are clogged either partially or fully. |
|
Title: Re: Idle Mixture Screw Post by DavetheDog on 05/22/09 at 13:33:29 0E1A01160D0D0A06630 wrote:
Nice, thanks for that info. It's just what I was looking for. I am in need of something in between the 52.5 and the 55. I am wondering though, did you do anything with the hole on the side for the emulsion tube or just drill out the hole down the center? |
|
Title: Re: Idle Mixture Screw Post by LANCER on 05/22/09 at 14:34:39 At the tme I did that I had the stock jet with just the hole in the end. If you have the air-bleed type with the side holes it will still work for you, increasing the size of any/all of the holes will increase fuel flow. For now just do the end hole. |
|
Title: Re: Idle Mixture Screw Post by diamond jim on 05/28/09 at 21:39:03 50756271607C71707B73140 wrote:
You running a pod filter? If so, try the 52.5 but then add a 2" tube between the pod filter and carb. This will increase the vacuum/velocity and pull fuel up through the 52.5 jet more effectively. Should be enough to get you fuel delivery that falls between the 52.5 and the 55 w/ bleed holes when using a pod filter directly on the carb. A 2" tube won't be quite long enough to effect powerband characteristics, just improve flow enough to make the 52.5 work a little better. Whenever I've improved flow, I've needed to make changes to reduce fuel delivery yet get better power and response. |
|
Title: Re: Idle Mixture Screw Post by Tonydtiger1971 on 07/27/09 at 20:02:11 626F626F333833000 wrote:
As a matter of fact I do enjoy Graphology ;D |
|
Title: Re: Idle Mixture Screw Post by dhowe003 on 08/07/09 at 13:57:20 Hey I am stumped because I can't get my 87' savage to run right. My carb has a 55, 150, and 1/2 spacer with K&N style filter and sportster muff. I adjust the idle screw to a good idle and the idle mix screw(right side) out 3/4 and it starts off great and will idle all day. I get the bike out on the road and it starts sputtering and popping and will die on me. If I put the coc to prime instead of on it will run. Does this make any sense to anyone? I am thinking the floats need adjusting, but I have them set to what my Clymer told me to do, and I have no other ideas. Please help. |
|
Title: Re: Idle Mixture Screw Post by Yonuh Adisi on 08/07/09 at 14:46:07 3834332B396C6C6F5C0 wrote:
Check the vacuum line for cracks and/or holes. If there is gas in the vacuum line, you have a defective petcock. (Hey Verslagen? do I get a nickle now?) |
|
Title: Re: Idle Mixture Screw Post by dhowe003 on 08/07/09 at 15:55:56 what would be the damage if i ride with it on prime until i get a new petcock? |
|
Title: Re: Idle Mixture Screw Post by Yonuh Adisi on 08/07/09 at 16:56:46 05090E1604515152610 wrote:
If you run out of gas while riding you have no reserve. |
|
Title: Re: Idle Mixture Screw Post by dhowe003 on 08/07/09 at 18:08:10 Thanks, I have another question. When you change the spacer, do you need to make any additional adjustments to the floats? |
|
Title: Re: Idle Mixture Screw Post by guidosguitarlounge on 08/15/09 at 19:24:15 great info. |
|
SuzukiSavage.com » Powered by YaBB 2.2! YaBB © 2000-2007. All Rights Reserved. |