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Old 09-21-2009, 04:28 PM   #1
OJgsxr
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Mechanical Issue Help

I have been having a very strange problem with my 08 GSXR 600 out at the track recently (last 7 or 8 track days) and it was the worst its been at Hallett this last weekend. Before last weekend it would happen maybe once a track day (typically not the first session) but last weekend it happened at the start of every session.

At the start of some of the sessions the bike will start chopping the throttle for some unknown reason. The RPMs will fluctuate on the tach and the bike will be really jerky. It will not start acting up until I start to accelerate hard, if I just coast around in the pits there are no problems and when it is happening if I pull in the clutch I can rev the engine with no issues. After 1/2 to 1 lap it will start working properly and I wont have any problems the rest of the session. Last weekend at Hallett the engine completely shut off once and I had to turn the bike (key) completely off then back on again to get the bike to start back up.

I have tried all of the basic stuff, connectors, making sure the bike warms up properly etc. The only performance mod I have made is a full yoshi exhaust. Its a full track bike so I cut off all of the switches on the clutch side (high/low beams etc) and pulled the accompanying fuses. The connectors for the lights and turn signals are still there but just zip tied to the fairing stay.

Any help or suggestions would be greatly appreciated (aside from the obvious comment of "its a GSXR that's your problem"). Thanks.
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Old 09-21-2009, 04:30 PM   #2
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sounds like a bad fuel pump.


find someone with a GSXR that will swap fuel tanks with you for a bit, put their tank on, and ride it and see if it fixes the problem.
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Old 09-21-2009, 05:27 PM   #3
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has the bike ever been dropped before?
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Old 09-21-2009, 07:21 PM   #4
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with the 08 600 there is a recall for the h02 sensor which causes a intermittent problem with rpms normally at steady speed/throttle opening.
This is what usually happens.

Any gear but easiest to find 3 or 4th, steady throttle aprox 6krpm the rpms will drop aprox 500-800rpm and then suddenly SNAP back on... can be pretty bad. This is a intermitent problem and not exactly the same as the one you are having.. but close. try to ride your bike at say 3rd gear 6-7k steady throttle and see if the rpm drop aprox 800rpm while holding steady throttle then snap back... Mabye this will help you.

Also have you bypased your clutch switch??

Last edited by Houston Terrell; 09-21-2009 at 07:24 PM. Reason: cauuseeee
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Old 09-21-2009, 08:50 PM   #5
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What Terrell said, sounds like a bad O2 sensor.
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Old 09-22-2009, 08:27 AM   #6
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OJgsxr's bike has a full yoshi exhaust on it. the 02 sensor is bypassed at the ecu (jumper wire) with the installation of this exhaust, isn't it?
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Old 09-22-2009, 09:17 AM   #7
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I cant remember if I cut off the O2 sensor or not but I did install a jumper on the ECU as per yoshi instructions to prevent it from going into limp mode.

Also when the problem does occur I can pull the clutch in and it revs fine to high RPMs and back down. Is this still consistent with an O2 sensor problem?
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Old 09-22-2009, 09:29 AM   #8
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Also, It has been dropped 2x, once before I got it (got it as a total from insurance) and back in April it was low sided at TWS (Texas World Speedway). The problem didnt start happening right after the low side but maybe like 2 or 3 track days after that.

The clutch switch has not been bypassed.
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Old 09-23-2009, 03:01 PM   #9
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Ok, the O2 sensor is in there, I called Polaris West about a recall on the sensor and they said they couldn't find a recall, however they say the emissions are covered for several years. They can diagnose if its the O2 sensor or not tomorrow but wont be able to get the part in before next week if that is the problem.

I have a track day this weekend with Bucks days, is there anything I can do to get the bike to work properly during the track day?
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Old 09-23-2009, 03:05 PM   #10
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Im sorry.. it is not a reacall it is a TSB.. Which means it is covered however it is a intermitent problem that is not happening enough to issue a recall.. Sorry for that.
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Old 09-23-2009, 03:55 PM   #11
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Quote:
Originally Posted by Patrick View Post
What Terrell said, sounds like a bad O2 sensor.
post a thread in the want to buy section maybe someone has one laying around
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Old 09-24-2009, 10:28 PM   #12
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Quote:
Originally Posted by OJgsxr View Post
Also, It has been dropped 2x, once before I got it (got it as a total from insurance) and back in April it was low sided at TWS (Texas World Speedway). The problem didnt start happening right after the low side but maybe like 2 or 3 track days after that.

The clutch switch has not been bypassed.
I have had this same problem before on my 07. It might be O2 Sensor but it can also be, If the bike has been dropped check out the Fuel Sensor under rear seat. See if it is firmly attatch.

Normally when you drop the bike sometimes u can fck up the fuel sensor and you have to get a new one. The reason why I say this is because the fuel sensor will sometimes allow the bike to stay on in neutral(or even with clutch pressed in) but it shuts it down in gear.

Just a Thought.
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Old 09-27-2009, 10:08 AM   #13
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Turns out it was the O2 sensor. I unplugged it under the gas tank and all day yesterday at my track day it ran without 1 hiccup. Thanks guys for the help, now to decide if I want to get an O2 sensor or a power commander.
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