SuzukiSavage.com - Low Speed Idle screw

Arnold Serious Thumper Offline The dude abides... Posts: 896 Westchester, NY Gender:	Low Speed Idle screw 09/03/10 at 11:18:41 Or rich/lean screw. Let's see if I get this right or if I am confused. Unscrew will make the mix leaner. Screwing will make the mix richer. ???
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jabman Senior Member Offline Posts: 411 England Gender:	Re: Low Speed Idle screw Reply #1 - 09/03/10 at 11:23:48 thats how it works for 2 stroke carbs but for the savage you have it back to front in is leaner out is richer
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Arnold Serious Thumper Offline The dude abides... Posts: 896 Westchester, NY Gender:	Re: Low Speed Idle screw Reply #2 - 09/03/10 at 11:29:37 Well I'll be darned. So I have been screwin it in (clockwise) according to instructions I read thinking I was making it rich and I should have gone counterclockwise. Trying to richen to get rid of backfiring...
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Arnold Serious Thumper Offline The dude abides... Posts: 896 Westchester, NY Gender:	Re: Low Speed Idle screw Reply #3 - 09/03/10 at 11:30:35 Although I must say it does not make that huge of a difference.
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jabman Senior Member Offline Posts: 411 England Gender:	Re: Low Speed Idle screw Reply #4 - 09/03/10 at 12:50:37 how many turns out from seated are you ?
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Arnold

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Re: Low Speed Idle screw
Reply #5 - 09/03/10 at 13:21:16

To me it sounded the best at one full turn from fully screwed in. But then it seemed unusual as most people have it between 2 and 4 turns from screwed in so I backed it up. Right now it is 2 full turn from all the way in but I have yet to test it out. It seems at one turn from fully seated it pops less but doesnt run very well, it actually ran better when it was popping louder.

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Re: Low Speed Idle screw
Reply #6 - 09/03/10 at 13:35:03

Practical theory... Afterfire commonly known as backfire is caused by the collection of raw fuel vapor in the tailpipe. So if you're adjusted very lean there'll be very little fuel to collect even though the engine is misfiring like crazy. Richen the mixture till it's running better, it misfires less but still does. But now has more fuel to pass and collect in the tailpipe. Richen it still more and you get to a magic point where misfire rarely occurs and very little fuel is sent to the tailpipe to await the influx of fresh air. And when it does, it goes poof, rather pow or KERPOW.

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Arnold Serious Thumper Offline The dude abides... Posts: 896 Westchester, NY Gender:	Re: Low Speed Idle screw Reply #7 - 09/03/10 at 13:39:24 Basis instructions I read everywhere about carb state to screw in all the way, the slowly back it up until the idle is the highest then adjusting the idle on the other side of the carb at the throttle screw. Problem is, in my case, idle is the highest when the screw is all the way in.
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jabman Senior Member Offline Posts: 411 England Gender:	Re: Low Speed Idle screw Reply #8 - 09/04/10 at 01:57:43 the other way of doing it is adjusting the screw for the best off idle throttle response, and how the bike chugs along with the throttle basically shut like my bike will take 3rd gear at 24mph no problem whats the slowest speed you run in 3rd gear? without the engine lugging
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Routy

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Re: Low Speed Idle screw
Reply #9 - 09/04/10 at 03:39:38

This is the proper way to adjust ANY "air/fuel" mixture screw on ANY carb. If this adjustment does not respond normal, most times it is caused by contamination some where in the low speed circuit, not saying that it couldn't be normal in some cases.
Removing the "air/fuel" mixture screw, and giving it a shot of air,....(or Seafoam?) will sometimes improve the response to the adjustment.
Arnold wrote on 09/03/10 at 13:39:24:

Basis instructions I read everywhere about carb state to screw in all the way, the slowly back it up until the idle is the highest then adjusting the idle on the other side of the carb at the throttle screw.

Problem is, in my case, idle is the highest when the screw is all the way in.

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Rich
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Arnold

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Re: Low Speed Idle screw
Reply #10 - 09/04/10 at 07:28:56

jabman wrote on 09/04/10 at 01:57:43:

the other way of doing it is adjusting the screw for the best off idle throttle response, and how the bike chugs along with the throttle basically shut

like my bike will take 3rd gear at 24mph no problem

whats the slowest speed you run in 3rd gear? without the engine lugging

I think you're about right, I usually switch from 2nd to 3rd right above 20mph. I like the torque on that engine, it really lets you go down in rpm in any gear. It also sounds good that way.

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Arnold

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Re: Low Speed Idle screw
Reply #11 - 09/04/10 at 07:34:32

Routy wrote on 09/04/10 at 03:39:38:

This is the proper way to adjust ANY "air/fuel" mixture screw on ANY carb. If this adjustment does not respond normal, most times it is caused by contamination some where in the low speed circuit, not saying that it couldn't be normal in some cases.
Removing the "air/fuel" mixture screw, and giving it a shot of air,....(or Seafoam?) will sometimes improve the response to the adjustment.
Arnold wrote on 09/03/10 at 13:39:24:

Basis instructions I read everywhere about carb state to screw in all the way, the slowly back it up until the idle is the highest then adjusting the idle on the other side of the carb at the throttle screw.

Problem is, in my case, idle is the highest when the screw is all the way in.

I think I was so used to be too lean that now that I put 155 main jet and pilot with bleed that I may actually have been too rich now.

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