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Discussion Starter #1
I have poured through posts and haven't found this answer yet. I'm sure I will get a good related post once I have this up, but here goes:

I have a 2000 929 that is pretty much stock (except for filters and oil) <!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="[email protected]@[email protected]@[email protected]@[email protected]@5xe" filled="f" stroked="f"> <v:stroke joinstyle="miter"/> <v:formulas> <v:f eqn="if lineDrawn pixelLineWidth 0"/> <v:f eqn="sum @0 1 0"/> <v:f eqn="sum 0 0 @1"/> <v:f eqn="prod @2 1 2"/> <v:f eqn="prod @3 21600 pixelWidth"/> <v:f eqn="prod @3 21600 pixelHeight"/> <v:f eqn="sum @0 0 1"/> <v:f eqn="prod @6 1 2"/> <v:f eqn="prod @7 21600 pixelWidth"/> <v:f eqn="sum @8 21600 0"/> <v:f eqn="prod @7 21600 pixelHeight"/> <v:f eqn="sum @10 21600 0"/> </v:formulas> <v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/> <o:lock v:ext="edit" aspectratio="t"/> </v:shapetype><v:shape id="_x0000_i1025" type="#_x0000_t75" alt="" style='width:12pt; height:12pt'> <v:imagedata src="file:///C:/DOCUME~1/MICROL~1/LOCALS~1/Temp/msoclip1/01/clip_image001.gif" o:href="http://www.fireblades.org/forums/images/smilies/biggrin.gif"/> </v:shape><![endif]--><!--[if !vml]-->:D<!--[endif]-->. It has new sprockets and chain as well. It has something like 25k miles on it.
Before and after the new chain and sprockets, when I am cruising in town or through campus at 25-40 mph, I get something like a chugging or surging. I'm not really sure what to call it. The effect is like I am pulling on the throttle a tiny bit and then letting off repeatedly, so it jerks the bike forward over and over. I don't have problems with it at higher speeds (50+) that I can tell. And at those slower speeds, it seems to happen the same in any gear.
Maybe this could be corrected with changing the idle or maybe the valves need to be adjusted. I don't think it is a fuel/air problem, but maybe at faster speeds, the rhythm just evens out to me.
It has also occurred to me that this is indicative of needing a valve adjustment.

Anyone have this problem already? Should I look at FI or valves or flapper mod or just switch to a Goldwing? :eyebrows:
 

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At what rpm's does the surging occur? It could be the HTEV opening/closing. Some mild surging is typical with the 929's due to the FI and HTEV...
 

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Discussion Starter #3
Low RPMS

Generally, from idle to 4000. It is the kind of thing where there isn't enough weight/wind resistance for their to be a constant load. In that condition, it's like it switches rapidly from throttle to coast and back again.
I feel inept trying to describe this symptom, anyone feel free to offer a better description.
 

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That's right around the range where the HTEV opens and closes. Have you checked the play in the throttle? You might try taking out any slack which helps lessen the on/off effect. The FI in the 929's is not known for it's smoothness either.

I think what you're experiencing is fairly typical...
 

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Red Rider said:
That's right around the range where the HTEV opens and closes. Have you checked the play in the throttle? You might try taking out any slack which helps lessen the on/off effect. The FI in the 929's is not known for it's smoothness either.

I think what you're experiencing is fairly typical...
Mine used to do a similar thing until I got rid of the htev. The FI is still a little twitchy at low rpms
 

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I am asuming that it is not too violent?
I have issues with my clutch at times when it does not engage fully. (Most likely from not shifting properly) It will chug along until I let it out smoothly.

I doubt that this is what you are experiencing though.
 

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Mine did and does the same thing. The problem got quite a bit better after i synched the throttle bodies but not totally gone.:idunno: Not sure what else to do.
 

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My '00 does the exact same thing. Easy solution? Change gears. My bike snaps back and forth at about 2500-3000, so I usually change a gear down, but if thats not possible I go up, and it gets smooth again. Haven't done any flapper/htev mods though.
 

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Depending on how rough you say it is, I would check for fraying or possibly an open circuit on your cam pulse generator (located on left side of head toward the top, black and grey wires going to it). When I had this problem, it felt like I was riding a bull (no, I've never ridden a bull before, but it had to be close to it...maybe not). Worth a look at the least.
 

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Sounds a lot like a fuel/air problem to me? If it is only right near closed throttle try turning the idle up slightly, How long has it been going on? Maybe bad fuel or dirt injectors etc. (possibly water in the fuel, try adding about half a cup of methylated spirits to the tank)
Surging can be caused by a lean condition, maybe a possible air leak somewhere?
 

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It's either/or the fueling and what gear you're in. If you cruise around campus doing 40-60KM/Hr in top gear, you'll get that no matter what you do, make sure you're in the appropriate gear for your speed. Add to that the mapping will help it, coz they're usually rich down low, and that'll cause the chugging as well, and you'll be sweet. But try the gear selection first to save you the dough.
 

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Aftermarket Exhaust

Factory mapping may be the issue, as my bike had a full D&D on it when I got it. Looking to get a power commander soon though.
 

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Discussion Starter #19
So, I was noticing a symptom like this the other day. Two days ago I cleaned, lubed, and adjusted my chain. I had lots of time, so I made sure that the adjustment was done right by triple checking after I was done. When I went for a ride, I didn't get this kind of behavior. The low-speed crusing was very smooth and switching from accellerating to slowing was very smooth as well. I guess I have never adjusted my chain very well in the past. From now on, I know what to do.

Oh, and why are related posts "Walking while intoxicated" and "Riding while pregnant?" WTF?
:idunno:
 
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