Jerking and bucking at cruising speed - Chicagoland Sportbikes
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post #1 of 19 (permalink) Old 05-21-2011, 05:53 PM Thread Starter
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Jerking and bucking at cruising speed

Im having a problem with my 01 GSXR 1000 jerking and bucking at light throttle, basically only when I'm trying to keep a steady speed. If I give it any amount of throttle to accelerate it is fine and pulls hard. It seems like the problem is not there when the engine is cold, and gets progressively worse the longer I ride. I replaced the plugs a few hundred miles ago, and it seemed to help at first, but then the jerking started again.

I bought the bike as it is and don't know any history of it. It has a Micron high-mount slip on, eliminating the exhaust valve, a K&N (which I cleaned and oiled when I did the plugs) and a Yoshimura Engine Management System, which is two boxes in the cargo area. I don't know anything about the tune in the EMS.

Any advice? Thanks in advance.

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post #2 of 19 (permalink) Old 05-21-2011, 08:46 PM

 
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See regulator thread.

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post #3 of 19 (permalink) Old 05-22-2011, 09:44 AM Thread Starter
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Thanks, that reminds me of something I forgot to mention in my original post.

There was one time a couple months ago that I went to go for a ride, and for some reason the bike didn't want to start. It was acting like it was flooded, and after trying unsuccessfully to start the bike I drained the battery. I pulled the seat off and removed the battery, and in doing so I noticed 2 green wires back by the rectifier that were melted, and I think I bumped one and broke it off. I took the battery home and charged it up, put it back in the bike, and it fired right up. I took a few short rides, and I assume the bike was not charging and just running off the battery because of the broken wire.

When I found some free time I cut out the melted wires and soldered in some new wire. When I was done I put a multi-meter on the battery and verified that it was being charged with the engine running. It appeared as if I fixed that issue.

That brings me to last night.

So, last night I went to my storage unit and looked over the wiring around the fuse box. I removed the right side fairing and looked over all the wiring there and I didn't see anything obvious. I made sure all connectors were snapped in and snug, and wiggled everything to make sure all wires were secure. I even started the bike and wiggled wires to see if it would affect idle, which it did not. I went on a short ride, and the problem was still there.

When I got back, shut the engine off, and quickly decided to move it, so I started the bike back up right away. I noticed that as I started it, it cranked for a second or two longer than normal before starting, and once started the tach did not respond right away, and instead did another full sweep, then started showing the rpm. I shut the engine off and started it a couple more times, and the tach did this every time. After the third or fourth time doing this, when I pressed the start switch, the engine turned over very slowly, and the headlights were very dim like the battery was dead, and it would not start. As soon as I let off the start switch, the headlights came back on full brightness, and it was as if the battery was fine. Go to start it again, same thing. I did not have a multi meter with me to check the battery voltage.

At that point I called it a night. When I get off work today I'm going to go and pull the tail section off and check the wiring back there by the rectifier and see if I find anything wrong. I'll admit, I know really don't know a whole lot about this kinda stuff

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post #4 of 19 (permalink) Old 05-22-2011, 10:08 AM

 
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Look a the wiring coming out of the fuse box into the box next to the fuse panel.

squeeze the female just a touch so they make better contact.

Gus
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post #5 of 19 (permalink) Old 05-22-2011, 12:47 PM Thread Starter
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I'll check that out too, thanks

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post #6 of 19 (permalink) Old 05-22-2011, 12:49 PM Thread Starter
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Oh, and does anybody know how to remove the fusebox from the ram air duct? I tried last night and couldn't figure it out, and I don't want to break anything messing around with it.

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post #7 of 19 (permalink) Old 05-22-2011, 06:15 PM

 
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is it on a frame of sorts ? It might slide up a tab held by rubber.

Gus
We offer three kinds of service @ Resurrection
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FAST service CHEAP won't be GOOD
and cold beer.

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post #8 of 19 (permalink) Old 05-22-2011, 10:06 PM Thread Starter
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Yep, it slips onto a bracket with rubber grommets at each end. Everything looked good visually, and all the wires seemed secure. I ended up pulling the tail section off and found another burned wire going to the rectifier. I was mistaken about what I previously wrote - it was not green wires I repaired before, it was two out of three yellow wires that I fixed and they still look good. Now the third yellow wire is a crispy critter. What could be causing these wires to burn up? They are burning at the connector for the rectifier but not on the rectifier side. BTW these wires are not going into a connector, they are plugged into the rectifier plug separately. I'm sure there's supposed to be a plug from the factory, but it was probably chopped off by the previous owner to fix burned wires, or so I assume.

What are the odds that this is causing my herky jerky problem?

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post #9 of 19 (permalink) Old 05-22-2011, 10:16 PM

 
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most wires get crispy because of resistance.These yellow wires 3 are sending ac voltage to the rectifier which then sends DC power to the regulator.

Any bad connections with IGS (Icky green stuff)can cause the hot wire.
after cleaning these connections and tightening the female you may choose to apply some electric grease.

These are for charging not ignition.

These wires can be disconnected and the bike will run until the battery dies.

Although a loose battery ground or positive connection can cause the bike to run as you describe.Along with a bad connection through the fuse panel as I said earlier.

Gus
We offer three kinds of service @ Resurrection
GOOD - CHEAP - FAST
You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.

Last edited by resurrection; 05-22-2011 at 10:27 PM.
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post #10 of 19 (permalink) Old 05-22-2011, 10:39 PM Thread Starter
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Ok, thanks. I will repair this one and tighten up the connections/apply grease. I'll also trace the battery leads and check them out. I'll also double check the fuse panel. Thanks so much for the help.

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post #11 of 19 (permalink) Old 05-23-2011, 04:53 AM
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Grasshopper would be proud Gus! Someone who actually listens when advice is given instead of running their mouth. Prime example of the help one can get on this board if one will just stfu for a change. Way to be Gus

Quote:
Originally Posted by Loki047 View Post
As long as their tits are bigger than their dicks, im in.

-"You will meet your destiny on the road of avoidance."

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post #12 of 19 (permalink) Old 05-23-2011, 06:19 AM

 
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I'm an ass that has no business sense see other threads.

Gus
We offer three kinds of service @ Resurrection
GOOD - CHEAP - FAST
You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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post #13 of 19 (permalink) Old 05-25-2011, 06:41 PM Thread Starter
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Well it looks like I got it figured out. After double and triple checking all wiring, I decided for shits and giggles to make a jumper wire and put it into dealer mode to check the tps. It was off, so I adjusted and put the bike back together. Test rode the bike 15 miles to work to repair the broken rectifier wire, and it didnt jerk once on the way here.

Thanks for all the help and advice

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post #14 of 19 (permalink) Old 05-25-2011, 06:56 PM
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well done!

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post #15 of 19 (permalink) Old 05-25-2011, 09:04 PM
Eat a bag o' dix!
 
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Awesome

Quote:
Originally Posted by Loki047 View Post
As long as their tits are bigger than their dicks, im in.

-"You will meet your destiny on the road of avoidance."

-"Yesterday is history, tomorrow is a mystery, and today is a gift. That is why we call it the present."

-"It's not considered premarital sex if you don't plan on getting married."
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post #16 of 19 (permalink) Old 05-25-2011, 09:43 PM

 
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cool beans

I'll get it next time, damn it

Gus
We offer three kinds of service @ Resurrection
GOOD - CHEAP - FAST
You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.

Last edited by resurrection; 05-25-2011 at 09:46 PM.
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post #17 of 19 (permalink) Old 07-22-2015, 10:04 PM
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How were u able to put it in dealer mode .My gsxr750 jerks bad when I'm trying to do a slow speed like 20-35 MPH. How do I fix that? Please help.
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post #18 of 19 (permalink) Old 01-28-2019, 04:11 PM
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my 03 GSXR 1000 is doing the same thing... its not the chain or my sprokets. its been driving me crazy.. i cant figure out what it is. When i get home today i am going to check out the rectifier.. i believe its on the left side under the rear fairing. I have changed it in the past, so i am hoping that i accidentally ddid something a little off, or a wire had resistance and lost a good connection. This jerking has GOT to stop. ITS DRIVING ME NUTS!!!
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post #19 of 19 (permalink) Old 02-10-2019, 11:53 AM
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Dealer mode is a jumper between two pins on a connector that is under the seat. It's detailed in the OEM service manual.

In dealer mode, you will see the temp gauge change to a pair of digits, and a dash. The position of the dash (top, middle, bottom) tells you if the TPS is set right.

I don't have my manual handy, so I can't tell you which the two pins are.

Other causes of bucking at neutral throttle could be a clogged/bad injector, or a bad spark plug/coil. If either of these are intermittent, you could see these symptoms, although they should still be there under acceleration, just less noticeable.

Craig
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Last edited by beac83; 02-10-2019 at 11:55 AM.
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