SuzukiSavage.com - Idle Mixture Screw

texsam Full Member Offline SuzukiSavage.com Rocks! Posts: 138	Re: Idle Mixture Screw Reply #30 - 05/18/09 at 14:22:54 when you install the diaphragm lockplate for white spacer mod the dimple ffaces down????? correct
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PTRider Senior Member Offline Posts: 397	Re: Idle Mixture Screw Reply #31 - 05/18/09 at 18:49:43 texsam wrote on 05/18/09 at 14:22:54: when you install the diaphragm lockplate for white spacer mod the dimple ffaces down????? correct Correct.
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texsam Full Member Offline SuzukiSavage.com Rocks! Posts: 138	Re: Idle Mixture Screw Reply #32 - 05/19/09 at 02:58:07 thank you
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kickstartmyheart

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Re: Idle Mixture Screw
Reply #33 - 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...

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andyr

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Re: Idle Mixture Screw
Reply #34 - 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.

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LANCER

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Re: Idle Mixture Screw
Reply #35 - 05/19/09 at 13:25:44

andyr wrote 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.

I maty, strange things can happen when a tiny passageway or two are clogged either partially or fully.

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DavetheDog

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Re: Idle Mixture Screw
Reply #36 - 05/22/09 at 13:33:29

kickstartmyheart wrote on 05/19/09 at 08:05:28:

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...

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?

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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10676 Oklahoma Gender:	Re: Idle Mixture Screw Reply #37 - 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.
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diamond jim

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Re: Idle Mixture Screw
Reply #38 - 05/28/09 at 21:39:03

DavetheDog wrote on 05/22/09 at 13:33:29:

... I am in need of something in between the 52.5 and the 55...

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.

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Tonydtiger1971

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Re: Idle Mixture Screw
Reply #39 - 07/27/09 at 20:02:11

bobo383 wrote 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...

As a matter of fact I do enjoy Graphology Grin

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dhowe003

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Re: Idle Mixture Screw
Reply #40 - 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.

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Yonuh Adisi FSO

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Re: Idle Mixture Screw
Reply #41 - 08/07/09 at 14:46:07

dhowe003 wrote 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.

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?)

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dhowe003 YaBB Newbies Offline 87' bobber Posts: 22 Kansas Gender:	Re: Idle Mixture Screw Reply #42 - 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?
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Yonuh Adisi FSO Serious Thumper Offline Savage Jedi (Knight) Posts: 3622 Pilot Valley NV, aka Tatooine Gender:	Re: Idle Mixture Screw Reply #43 - 08/07/09 at 16:56:46 dhowe003 wrote 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? If you run out of gas while riding you have no reserve.
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dhowe003 YaBB Newbies Offline 87' bobber Posts: 22 Kansas Gender:	Re: Idle Mixture Screw Reply #44 - 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?
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