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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> 2006 S40 small jerks when keep my throttle steady /cgi-bin/YaBB.pl?num=1490288039 Message started by Afan on 03/23/17 at 09:53:59 |
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Title: 2006 S40 small jerks when keep my throttle steady Post by Afan on 03/23/17 at 09:53:59 Hi, What could cause "jerking" when in 2nd or 3rd gear, keep the throttle steady and ride 20-35 mph? They are small, sometimes hard to feel, every couple seconds jerks. In 4th gear rarely, sometimes, hard to tell. Kinda the lower speed it is more frequent and "harder" jerks. When accelerating it's ok. The bike wasn't winterized the best way, but in last 2 months I rode couple tanks of gas with that gas cleaner thing and looks ok. Battery is good. I thought it could be the carburetor so I took it off and cleaned (even it was cleaned about 2 years ago). Any idea what it could be? Where to start? :-[ |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by batman on 03/23/17 at 10:27:04 Sounds like your lugging the motor at 20mph you should be in first gear,35 is best in 2nd gear,you shouldn't go to 3rd unless you doing about 40mph.Torque peaks at about 3500rpm the speeds your trying to ride at the rpm is about 2200rpm (to low). |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 10:37:32 2023362F232C767A420 wrote:
The way I'm doing is I would start in 1st, of course, and shortly after switch to 2nd. When reach 30 mph (or a bit before, depends if I'm still accelerating or ride on a slow road) I would switch to 3rd gear. Learned from my manual car and ST1100 I have too. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by justin_o_guy2 on 03/23/17 at 10:38:56 Unless you're climbing a bit of a hill or pushing into a stiff breeze, you should be able to roll along in second at twenty, as long as the rear tire is not taller than stock. Very gentle acceleration should be fine from there. Same is true for thirty in third. Try putting the choke on the first click and see if anything changes. Is there any noise that coincides with the pulse? Try setting the petcock to prime. And, try holding a set speed in a lower gear. See if Batman is onto something. Run a steady speed between 25 & 30 in second and see how it goes. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 10:59:39 4F5056514C4B7A4A7A42505C17250 wrote:
Ok. I'm gonna try all these and post if there is any difference. Thanks. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by batman on 03/23/17 at 11:03:32 Afan ,you can't go by what your 1100 cc bike does,your single has to fire once every 720 degrees (the piston fires every other rotation )the st 1100 has a power stroke every 180 degrees,different animal!Just like our idle,you need to keep the revs up a bit higher on this puppy. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 11:05:06 3132273E323D676B530 wrote:
True... :-/ |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by justin_o_guy2 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. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 11:40:23 46595F5845427343734B59551E2C0 wrote:
I had installed Yamaha petcock as suggested on this forum. I'm selling the bike and every time I mentioned it they made sour face. So I put the original back on. :( |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Ruttly on 03/23/17 at 12:28:40 So was it ok with raptor petcock ? If so maybe it's the stock one you put back on ! |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 12:38:01 527574746C79000 wrote:
No. it was the same with the raptor. Although, this is my very first bike EVER, and I bought it from a dealership. So, many of the bike "behaviors" I assumed it should be that way. After I put the raptor I didn't see any difference - what is not any good argument because, as a newbie, it would be hard for me to feel any "slightly" or less difference. Last year, I hopped on the bike for old time sake and felt (recognized?!?) the jerking motions. In January this year it was really bothering me. I'm selling the bike - now it freaks me out! ;D And, when I put the OEM back - no difference again. So, pretty sure it doesn't have anything with petcock. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 12:44:06 As I said, I took off the carb and cleaned it. Checked and cleaned the membrane and the needle, float bowl, float needle, main jet, pilot jet... Didn't touch the air/gas adjusters (or whatever the name is). Could I screw up something while cleaning it?!? :-[ |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by norm92de on 03/23/17 at 12:52:38 Afan, You may have a lean misfire. What is your altitude above sea level? What JOG suggested may help if it is running lean. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 14:31:34 56574A55010A5C5D380 wrote:
I live in Iowa - pretty "low" :D |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Ruttly on 03/23/17 at 15:06:55 Or a vacuum leak ! |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by justin_o_guy2 on 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by eau de sauvage on 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 17:35:34 517677776F7A030 wrote:
I'm listening... :o |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 17:45:51 7A656364797E4F7F4F77656922100 wrote:
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" ;D 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. ;D ;D ;D So, I'm assuming I should do some corrections of the fuel mixture, right? |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Kris01 on 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by justin_o_guy2 on 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 17:51:35 514E484F52556454645C4E42093B0 wrote:
Sorry but don't understand this?!? :-[ |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by justin_o_guy2 on 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/23/17 at 18:30:31 26393F3825221323132B39357E4C0 wrote:
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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by eau de sauvage on 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Kris01 on 03/23/17 at 18:38:47 That's the one. Your carb has probably never been touched. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Kris01 on 03/23/17 at 18:39:42 46544043545250350 wrote:
Not necessarily. At least not for me. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by eau de sauvage on 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by eau de sauvage on 03/23/17 at 18:48:29 665F445E1D1C2D0 wrote:
Not necessarily. At least not for me.[/quote] 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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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Kris01 on 03/23/17 at 18:48:38 4D7F687F797B414C717C1E0 wrote:
Pay attention to this! [smiley=thumbsup.gif] |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Kris01 on 03/23/17 at 18:52:36 54465251464042270 wrote:
LOL! Every bike is different. What works perfectly for one person may not do anything for someone else. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by justin_o_guy2 on 03/23/17 at 19:21:53 Start out by closing the screw. Count the turns in. Seat it gently, You'll need to drop the idle speed to be able to catch the engine respond to the adjustment. Ride and warm it up. I did the adjustment at stop lights. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Ruttly on 03/23/17 at 20:37:42 Check all the vacuum hose at carb , tank , charcoal canister for being loose or cracking. Also check rubber intake manifold between head & carb. Start engine spray some carb cleaner around it and along the hoses , you will hear the change in idle when you find a leak , do it outdoors and try not to spray it on painted areas , just on hoses & manifold |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by batman on 03/24/17 at 10:41:17 It seems a shame that Afan has been a member for nearly 4 years and hasn't even attemped to adjust the air screw,or mod the carb for his elevation, and just wants it running good so he can sell it ! |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/24/17 at 11:26:36 4142574E424D171B230 wrote:
It's true. In my defense, if I may, this is my first bike, no bike-knowledge before. I learned a lot. But less than year after I bought it I got a 60 mile commuting job and I bought a bigger bike so I can take an Interstate to get to my office. Also, after three 200+ miles trips with S40 around Iowa I found that my tail bone is not in good relationship with the seat. But it was fixable I think. I bought tank bag and sissy bar bags... I was getting ready for longer trips. But, as I said, I bought other bike... I'm sorry if I hurt anybody's feelings... :-[ And I'm very thankful for all your help, I really appreciate it. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Kris01 on 03/24/17 at 17:33:38 Once you sell the Savage, stick around. You'll want it back! ;D |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/24/17 at 17:59:16 675E455F1C1D2C0 wrote:
;D |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by eau de sauvage on 03/24/17 at 19:54:07 645D465C1F1E2F0 wrote:
Mine isn't. ;¬) https://youtu.be/KHbzSif78qQ?t=32s |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/25/17 at 15:51:51 27352122353331540 wrote:
If I may, again... :) It looks like it doesn't work well. My air/fuel screw was on 2 1/4 turns. I turned up to 4 turns (from the full closed position) and the difference was really tiny (maybe it was my brain?!?!). I was turning in 1/4 turns and was waiting for 15-20 sec to see/hear any difference. I turned back one turn so it's now 3 or 3 1/4 turns. I did just short test ride around the block because it was rain but didn't feel big difference. It was better, sure. But not sooo better as when I pull the choke. :( |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Ruttly on 03/25/17 at 19:54:21 IN most cases , going beyond 3 turns out does nothing. All the adjustment is in the first 3 turns. However when you adjusting it make sure engine is at full operating temperature and choke is off. Did you check for vacuum leaks ? |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by batman on 03/26/17 at 13:27:45 I believe his surging is do to the needing the white spacer mod and maybe a larger idle jet being his elevation is a bit less than 800ft. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by Afan on 03/26/17 at 15:41:21 301716160E1B620 wrote:
Done. This is what I found. Only one spot when sprayed caused the change in idle. https://youtu.be/-CCUxjjDQho |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by batman on 03/26/17 at 18:02:39 Afan that appears to be the outboard end of the throttle shaft ,I' d remove that c clip and see if there isn't a seal under it ,like an O ring,that you can replace as the air is being suck in and leaning out the fuel mix.I admit I've never had mine out so I don't know what you'll find.oops! just looked in the clymers book, clip ,washer,seal. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by justin_o_guy2 on 03/26/17 at 18:55:46 Let it sniff a few drops of transmission fluid. If that doesn't help, either fix it right or try a seal leak stopper. |
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Title: Re: 2006 S40 small jerks when keep my throttle ste Post by batman on 03/26/17 at 23:42:08 If the seal is bad try an O ring,maybe a little vasoline for lube. |
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