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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> My Bike is a Jerk ... at Low Speeds /cgi-bin/YaBB.pl?num=1345492853 Message started by denistheruski on 08/20/12 at 13:00:53 |
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Title: My Bike is a Jerk ... at Low Speeds Post by denistheruski on 08/20/12 at 13:00:53 Bought a 2005 S40 about a month ago with ~4000 miles on it. I'm now noticing that at low speeds (not necessarily low RPMs), the bike jerks under acceleration. Not sure how else to describe it other than uneven acceleration, even though I'm holding the throttle steady. I did the easy stuff: changed the oil and replaced the air filter. That didn't help. What should I try next? Should I try a fuel additive to clean out the system? Should I check the spark plug? Could it be an issue with the carb? Basically, what's my next move? Not sure if this is related but my bike requires choke for about a minute upon startup, even with air temps at ~85 deg and higher. Without the choke, the engine idles very low (I already adjusted the idle screw) and dies. Any thoughts or points into some direction are greatly appreciated. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by RanDaMan on 08/20/12 at 13:06:34 stock muffler? :-? |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by bill67 on 08/20/12 at 13:07:00 Put some Sea Foam in the gas it will clean the carb and lube the carb slide. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by verslagen1 on 08/20/12 at 13:07:10 sounds like a sticky slide either disassemble and clean or add an ounce of seafoam per gal. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Dave on 08/20/12 at 13:09:17 I rode a stock unmolested bike when I was riding used ones looking for one to buy. I noticed that this bike did not run real smooth at low throttle settings just off idle....the way you would ride down the street in your neighborhood when you want to be nice to the neighbors. It rode much smoother under full throttle. I believe the engine was running a bit lean and would have benefitted from a larger pilot jet and the modification to the slide to replace the white spacer with the three washers. Go to the Technical Section, find the index, and look under Carb mods. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by bill67 on 08/20/12 at 13:09:46 If you want drop the float bowl and put a little Sea Foam in there it will work a little faster. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Charon on 08/20/12 at 13:25:26 Having read the MSDS list of ingredients in Seafoam, I believe it is a completely worthless product. The carburetor slide is lubricated by gasoline, which is itself a very light oil. And gasoline is at least as good a solvent as anything in Seafoam, particularly if the gasoline includes ethanol. However, if you'd feel better putting an additive in there, go for it. At the very least it will do no harm. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by bill67 on 08/20/12 at 13:27:28 Then just put some gasoline in your tank and your good to go.thanks charon I never would have thought of that. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Charon on 08/20/12 at 14:27:33 The thing about Seafoam and other gas additives is that you put small quantities (an ounce of Seafoam per gallon of gas, less than 1%, for instance) in a tank of fresh gas, then you run it. The fresh gas, with its Federally mandated detergent package, flushes out the system, and usually that is about all that is needed. The additive gets the credit, even though it basically does nothing. It is the placebo effect writ large. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by denistheruski on 08/20/12 at 15:15:22 Thanks for the responses, everybody. I'll try some SeaFoam and see if that helps. I've thought about the carb mod but I'm a bit apprehensive since this is my first bike and I've never really worked on cars or anything. Eventually, I'm sure I'll get there... RanDaMan, it is a stock exhaust. In face, the bike is 100% stock. So no votes for bad spark plug? Or is it possible that it's the petcock? |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Jacob on 08/20/12 at 15:25:58 My throttle was really choppy when I bought my bike brand new a few months ago.. I believe it has to do with the carb.. I did the white spacer mod. I changed out the white spacer with the 3 small washers I got from the jet kit I ordered from LANCER... Right after that mod I could ride down town, 2nd gear 25mph and it was smooth!! No lagging and it wasn't choppy at all!! I also changed my muffler to a harley dyna muffler and got rid of that CANON they call stock muffler, re-jetted my carb with the jetset I got from LANCER and it runs and sounds amazing!!! I also changed my spark plug to a performance star plug. I hated this bike stock but after a few mods, I am really starting to love it! (My opinion) |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Ed L. on 08/20/12 at 16:52:03 If the bike is jerking at a low speed try downshifting to a lower gear. Run a little more engine RPM and let the big single sing in it's torque range. If you are lugging the engine you are risking low oil pressure, it's not a Harley so twist that throttle. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Digger on 08/20/12 at 19:32:10 30313A3D27203C312621273F3D540 wrote:
Are you hearing any misfiring? |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by ZAR on 08/20/12 at 19:36:31 4A6B5043210F0 wrote:
Agreed.....sounds like you may be lugging the engine. Downshift and keep her in the power band. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by denistheruski on 08/20/12 at 20:43:32 Nope, not lugging. I feel some jerkiness through most of the RPM range, even at mid to higher revs. Could this be a hint: even when I'm sitting in neutral, a minute or so after start-up, if I rev it to mid-RPMs, it's very sluggish to respond. After more warm-up time, it's better in neutral but I still feel this "sluggishness" or jerkiness when I'm in gear. I searched for some youtube videos of misfiring to hear what it sounds like. Correct me if I'm wrong but it should sound like out of synch popping? Anyway, I don't think I'm hearing that on my bike but I'll listen closely on my ride tomorrow. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by justin_o_guy2 on 08/20/12 at 20:49:01 Sounds like a sticky slide |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Boofer on 08/20/12 at 20:59:54 Let's face it boys, gas is getting "worser" by the day. This month the first page in Motorcycle Consumer News is titled "Ethanol". And either Cycle World or Rider magazine has an answer in the tech section stating the effects Ethanol and the EPA has had on our bikes performance. Even the newer bikes with injection are having some problems with uneven power bands, jerking, parts that handle gas leaking or other problems. The owners are mad, the dealers just throw up their hands, and the bikes get a bad name. As one author put it, "These companies don't want to sell less than perfect machines, but it is what it is." That quote isn't verbatim, but lean engines running weak gas don't work like they should. Try taking half the sugar and putting 1/3 more water in your tea, and you'll get my drift. ;) |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Dave on 08/21/12 at 06:05:31 Where do you live? Maybe someone in the area can ride your bike and your ride theirs....and see if they can help. I think all members should update their personnel information to include where they are from......it would help us to know if we live close by and can help in person. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Routy on 08/21/12 at 06:06:18 Quote: Bought a 2005 S40 about a month ago with ~4000 miles on it. I'm now noticing that the bike jerks under acceleration. Not sure how else to describe it other than uneven acceleration, even though I'm holding the throttle steady ---------------------------------------------------------------- Your going to have to make up your mind,....... is it jerking under acceleration, (sp plug, dirty carb, restricted gas supply, etc) or is it jerking under steady throttle at low speed,......and 1 click on the choke improves it 90% ??? (white spacer mod will fix it) You can forget the "bad gas" garbage !! Todays gas keeps carbs spotless, and all our engines have never run better !! |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Trippah on 08/21/12 at 06:30:11 Well - a 20005 is 6 -7 years old, 4K mile is 600 per year unless it sat for a while. You say the idle is good - did you set it by ear of measure the RPM's.? Once you are sure the idle is in spec, then check the carb, with the previoiiusly mentioned sticky slide the logical culprit. Good luck with the hunt. :D |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by denistheruski on 08/21/12 at 14:58:14 Man I love the wealth of info at this forum. Thanks for everyone's responses. Dave, great call. I'm in Austin, TX. If there are any members in my area, it would be great to compare how my bike rides to someone else's. Routy, I guess I was a little unclear. I'm noticing this problem both during steady throttle and under acceleration but only at low speeds (under around 35 mph I'd say). It seems to get a little better after I've ridden a good 20 minutes and at highway speeds. Trippah, I set the idle by ear. Is there an easy way to measure RPMs without special tools/instruments? |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by justin_o_guy2 on 08/21/12 at 21:13:14 Well - a 20005 is 6 -7 years old, 4K mile is 600 per year unless it sat for a while. 600 miles a year IS sitting a while.. Id pull the tube to the air filter( yea, need a truck to get it out) & watch the slide when I twisted on the part the cable goes to on the carb. I think what youre describing sounds like a sticky slide. Would it be okay to squirt some Berrymans in it( shut off, of course) & use a thin screwdriver to raise the slide & let it drop a few times? I cant see a reason not to,, |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by youzguyz on 08/22/12 at 04:30:21 61606B6C76716D607770766E6C050 wrote:
I'm in San Antonio, and I am out riding every weekend. I could probably meet you half way Saturday or Sunday. Driftwood, Dripping Springs, Wimberley. that general area. I have another ride that I am suppose to lead, but those plans haven't gelled yet. Let me know if you want to do something, and which day, and I will see if I can nudge the other ride to the other day. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by denistheruski on 08/22/12 at 16:06:51 justin, I'm still getting used to the mechanical stuff. What is the slide in the carb and what does it do? youzguyz, I'm going to PM you in a minute. |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by Trippah on 08/22/12 at 20:39:49 To accurately set the idle you need a tachometer (inductive type) that reads the electrical impulses to your spark plug..either by wrapping a lead around the cable or a clip that clips onto the spark plug wire. You are talking about 45 - 100 dollars depending on how fancy and if you want permantenly mounted and of course permanently working. Some have added them I thin nk to their handlebar clusters..I''ll let the mechanics jump in because this has to be right before you start messing with the carb, ::) ::) |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by justin_o_guy2 on 08/22/12 at 21:02:50 If I could remember the make of the carb, Id enter ( carb name) carburetor exploded view The slide does what the butterfly does on a carb on a car, controls the airflow. Ours, tho, also raises & lowers the metering rod. The throttle cable doesnt lift the slide, tho, vacuum does. You know where it is, because I said how I would go about getting access to it, Anyway, since it is Vac. operated, just a fingerprint on it will mess up how it works, |
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Title: Re: My Bike is a Jerk ... at Low Speeds Post by youzguyz on 08/23/12 at 02:19:43 5B444245585F6E5E6E56444803310 wrote:
It's #2 in this exploded view: http://www.bikebandit.com/2005-suzuki-boulevard-s40-ls650/o/m147635#sch505570 The skinny round part at the bottom is metal, and is called "the slide". Like JOG says, you will see it when you pull off the boot between the airbox and carb. Can't miss it. |
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