SuzukiSavage.com - 2006 S40 small jerks when keep my throttle steady

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: 2006 S40 small jerks when keep my throttle ste Reply #15 - 03/23/17 at 15:56:21 If it runs steady at higher RPM it is running right with less vacuum.
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eau de sauvage Serious Thumper Offline Posts: 2565 Queensland Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #16 - 03/23/17 at 16:40:00 Doesn't this sound like a surging issue? If so prolly solved with a little adjustment on the fuel/air mix screw.
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Afan Full Member Offline SuzukiSavage.com Rocks! Posts: 156 Des Moines, IA Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #17 - 03/23/17 at 17:35:34 Ruttly wrote on 03/23/17 at 15:06:55: Or a vacuum leak ! I'm listening...
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Afan

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Re: 2006 S40 small jerks when keep my throttle ste
Reply #18 - 03/23/17 at 17:45:51

justin_o_guy2 wrote on 03/23/17 at 11:16:12:

OEM jets on a 2006 are gonna be small.
In the lower gears the throttle opening at lower speeds may be still trying to use the idle circuit. You're just off idle. That's why I suggested the choke. Get a bit more gas in it and see how it acts.
The stock petcock will get you one day.

I just tested it. Yes, when I pull the choke to the first position it's better. When I pulled the choke all the way it was ok. Hardly to feel any jerking motion.
But the bike was "roaring" Grin

In one moment, while in 2nd gear and riding through the resident area, I accidentally let go of the throttle, took of my hand, and the bike continue to go w/o any problem. Like a scooter. Grin

So, I'm assuming I should do some corrections of the fuel mixture, right?

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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #19 - 03/23/17 at 17:48:45 These carbs are jetted really lean from the factory. You are experiencing a lean surge. You need to rejet the carb with larger jets to flow more fuel. Pulling the choke out essentially accomplishes the same thing. That bucking is your engine complaining you're not giving it enough fuel.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: 2006 S40 small jerks when keep my throttle ste Reply #20 - 03/23/17 at 17:49:45 What has been done to get the jetting off? Id probably check the idle air.
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Afan Full Member Offline SuzukiSavage.com Rocks! Posts: 156 Des Moines, IA Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #21 - 03/23/17 at 17:51:35 justin_o_guy2 wrote on 03/23/17 at 17:49:45: What has been done to get the jetting off? Id probably check the idle air. Sorry but don't understand this?!?
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justin_o_guy2

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Re: 2006 S40 small jerks when keep my throttle ste
Reply #22 - 03/23/17 at 18:13:48

Hey, me neether! But you are gonna need to do it.
I'd try it before I rejet. But, you're probably lean. That's what I was expecting the choke to show. You added a bit of fuel, and it got better.
I Suspect you're running off the pilot circuit at those speeds , but why a carb gooroo hasn't joined in, I dunno.
Look in the tech section.
Your carb may still have the brass cap over the adjustment. How to remove it is covered, too.

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Afan Full Member Offline SuzukiSavage.com Rocks! Posts: 156 Des Moines, IA Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #23 - 03/23/17 at 18:30:31 justin_o_guy2 wrote on 03/23/17 at 18:13:48: Your carb may still have the brass cap over the adjustment. How to remove it is covered, too. This is what are you talking about, right? http://suzukisavage.com/cgi-bin/YaBB.pl?num=1221818822 And yes, still have brass cap over the adjustment.
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eau de sauvage

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Re: 2006 S40 small jerks when keep my throttle ste
Reply #24 - 03/23/17 at 18:38:47

Yep that is the screw you need to adjust. FFIW, I recently rejetted a larger pilot for a new muffler, BUT before I did that simply adjusting that air/fuel mix completely eliminated the surging problems. While the S40 is jetted lean, you do not need to rejet to eliminate the surging, just setting the air/fuel screw correctly will fix your current problem.

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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #25 - 03/23/17 at 18:38:47 That's the one. Your carb has probably never been touched.
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #26 - 03/23/17 at 18:39:42 eau de sauvage wrote on 03/23/17 at 18:38:47: just setting the air/fuel screw correctly will fix your current problem. Not necessarily. At least not for me.
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

eau de sauvage Serious Thumper Offline Posts: 2565 Queensland Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #27 - 03/23/17 at 18:46:06 Once you've got that little brass sucker out this is how you adjust it... http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1157720585
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eau de sauvage

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Re: 2006 S40 small jerks when keep my throttle ste
Reply #28 - 03/23/17 at 18:48:29

Kris01 wrote on 03/23/17 at 18:39:42:

eau de sauvage wrote on 03/23/17 at 18:38:47:

just setting the air/fuel screw correctly will fix your current problem.

Not necessarily. At least not for me.

Ha! fair enough. I'm at sea level. Mind you it was nearly 3 turns out so I went for a bigger pilot anyway.

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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: 2006 S40 small jerks when keep my throttle ste Reply #29 - 03/23/17 at 18:48:38 Savage_Rob wrote on 09/08/06 at 06:03:05: If after you have finished this process, the pilot adjusting screw is 2.5 -3 turns out, then you definitely need the next larger pilot jet. For myself, if I go over 2 turns out then I go up to the next size pilot jet. Pay attention to this!
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged