Bike Dies Over Bumps!! Help!! - 600RR.net
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post #1 of 17 (permalink) Old 11-28-2007, 12:53 AM Thread Starter
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Angry Bike Dies Over Bumps!! Help!!

Here's my situation, when I ride over bumps like say railroad track, my bike will die. Sometimes, its just for a second, once it died and wouldn't start back up until I unpluged my ECU and pluged it back in. I have an 04 with a pc3usb, and full exhaust. Here's what i know. It feels like the bike isn't getting fuel when this happens. My wire harnesses are all right, the kickstand switch, and kill switch aren't it, the bike still turns over when this happens. Any help would be great, I'm leaning towards my ECU, Bank Angle Sensor, my fuel shut off relay, and that's where I'm at right now. Any ideas would be greatly appreciated.
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post #2 of 17 (permalink) Old 11-28-2007, 01:05 AM
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Originally Posted by snailracing View Post
I'm leaning towards my ECU, Bank Angle Sensor, my fuel shut off relay, and that's where I'm at right now. Any ideas would be greatly appreciated.
it could be any one of those. i suspect a loose connection somewhere. i wouldn't rule out any of the afore mentioned though. it could be broken internally. time to get a rear stand, a multimeter, and a dead-blow hammer.
post #3 of 17 (permalink) Old 11-29-2007, 06:57 AM
 
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That sounds like a good starting point. Check your Fuel pump wire under your tank, it might be loose or have dirt in it. T




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post #4 of 17 (permalink) Old 11-29-2007, 07:21 AM
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I had this with a brand new GPX250. I was trying to put some kms on it while running it in and ended up almost stranded a 100 miles from home. The bike displayed similar symptoms to what you have described except that it was happening more when cornering. I was able to keep it running by pulling the wiring harness at the head stem. May I say it was a tame ride home.

I started diagnosing the issue and found it was definately related to the main wiring harness. I was able to narrow it down to a junction just below the seat and upon removal of the tape found a poorly soldered joint on the earth wire. Got the soldering iron out and fixed up the joint which fixed the problem.

Hope you find your problem sooner than later.
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post #5 of 17 (permalink) Old 11-29-2007, 08:17 AM
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Loose connection at the battery? start with the basics.


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post #6 of 17 (permalink) Old 11-29-2007, 09:17 AM
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+1 for starting at the battery connections and working your way to the grounding wires. Then the rest of the electrical system.
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post #7 of 17 (permalink) Old 11-29-2007, 09:37 AM
 
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yeah def loose conec with the battery is where id look first, then the tip sensor connections....its probally moving around when hitting bumps and causing the bike to shut off...good luck.
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post #8 of 17 (permalink) Old 11-29-2007, 02:07 PM Thread Starter
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Thanks for all the advice, I'm hoping to get some progress done today on her, and i'll keep everyone posted.
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post #9 of 17 (permalink) Old 11-30-2007, 06:49 AM Thread Starter
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Here's what I got as of now, Bank Angle is good, battery connections good, PC3 good, fuel stop relay is good. Next I'm going to cheak ECU, and then move on to fuel pump wiring, and injectors under the tank.
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post #10 of 17 (permalink) Old 11-30-2007, 12:05 PM
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i hate dealing with electrical problems! but sounds like all the advise i would give has been given already
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post #11 of 17 (permalink) Old 12-02-2007, 05:06 PM Thread Starter
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The ECU seems alright, and so do all my relays and my battery connections are tight. Next I'll look at all my wiring, which i'm not looking forward to. I'm starting to wonder if it is the ECU or PC, and they are just having a moment of not working. Here's how I've been testing it, I take the item and give it a solid hit with my dead blow to simulate hitting a bump. Why I think it's the ECU, the one time, it wouldn't start up again, I unplugged the ECU and it fired back up after that. Thanks again for the advice already.
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post #12 of 17 (permalink) Old 12-03-2007, 07:20 AM
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+1 my guess is tilt sensor
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post #13 of 17 (permalink) Old 12-06-2007, 02:47 PM Thread Starter
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Angry

Any more ideas people, I havn't been able to figure it out, everything seems to check out alright. I've heard of the power commanders going bad but, I'm completely sure what the observed issues were with them. Any help is still greatly appreciated.
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post #14 of 17 (permalink) Old 09-02-2008, 01:00 PM
 
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I know this is an old thread, but I'm experiencing the same problem on my 08. Did you ever figure out what this was? Or has anyone else had this problem? Thanks.
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post #15 of 17 (permalink) Old 09-02-2008, 01:10 PM
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Check the kickstand switch. My buddy had the same problem with his trackbike at BeaveRun. His bike kept cutting out when he went over all the bumps and it turned out his kickstand was just slightly bouncing off the sensor or whatever. He ziptied the kickstand up for a session and no problems.
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post #16 of 17 (permalink) Old 09-02-2008, 01:11 PM
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relays

Try the relays first, I havn't played with the 07/08 enough to know where there at but if you have the bike running and play with the relays and it cuts then your good.
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post #17 of 17 (permalink) Old 09-02-2008, 01:56 PM
 
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I'd be looking at the wiring around the headstock from the bars.
Had this on one of my bikes & it was a wire grounding out coming from the kill switch that had rubbed around the headstock due to installing it without enough slack.
Its unlikely (but still possible) to be ECU, injectors, or relays due to it starting normally immediately after.
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