K6 600 Bogging under heavy throttle/higher RPM - Suzuki GSX-R Motorcycle Forums Gixxer.com
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post #1 of 27 (permalink) Old 04-23-2017, 09:31 PM Thread Starter
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K6 600 Bogging under heavy throttle/higher RPM

Good evening everyone,
I recently purchased a K6 GSXR 600 16,000 miles and am having some issues with it bogging down. So far I have changed the oil/filter (OEM/AMSOIL), purchased a new K&N airfilter (not the race one), flow tested the fuel pump/filter assembly. I also adjusted the throttle position sensor tonight, but have not gotten a chance to test it out tomorrow. My biggest concern is what my valves looked like when I pulled the airbox off (see pictures below) do these look normal for 16k miles? should I run a fuel system cleaner? does this clean valves aswell? anyway the next steps I have found doing research is syncing the throttle bodies and getting the injectors cleaned/tested. also the exhaust valve servo has been removed (counter clockwise all the way to open correct?) Lastly, it has a R55 race exhaust and no power commander, but from my knowledge it should not need a tune.? If anyone has any input on what I should and should not do it would be greatly appreciated. This bike is currently my DD until I fix my truck.
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post #2 of 27 (permalink) Old 04-23-2017, 09:40 PM Thread Starter
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Re: K6 600 Bogging under heavy throttle/higher RPM

Fuel filter and exhaust
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post #3 of 27 (permalink) Old 04-23-2017, 09:49 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

When did this problem begin manifesting? Did you make any modification before it began? Can you describe how it "bogs down", and at what specific RPMs?

What was the result from the fuel flow test? Did you perform a fuel pressure test? What condition are your spark plugs in? Have you considered your fuel injectors?

If you are running a full aftermarket exhaust, you absolutely need a tune.
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post #4 of 27 (permalink) Old 04-23-2017, 10:08 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

Did you run the fuel flow test as described by the manual? For 30 seconds? And what was the fuel amount?
As Tate said, a full exhaust most definitely needs a tune using either an ECU flash or a fuel module. However, you talking about the servo sounds like it has just a slip-on. And the valve is to be fully counter-clockwise to be open.

If it's bogging at high RPM, no amount of TB syncing is going to fix that. That's a big issue, and you need to test it. If it's not the pump, it is quite possible that a fuel injector is not spraying, spark plugs need to be replaced, vacuum leak, low compression, etc.

2006 GSXR 250 with an Akrapovic full exhaust and a flashed ECM. 162whp, 77ft-lb. Slow-lane certified
2000 Honda VTR 1000. Practically a 250.
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post #5 of 27 (permalink) Old 04-24-2017, 07:30 AM Thread Starter
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Re: K6 600 Bogging under heavy throttle/higher RPM

Quote:
Originally Posted by tatersalad314 View Post
When did this problem begin manifesting? Did you make any modification before it began? Can you describe how it "bogs down", and at what specific RPMs?

What was the result from the fuel flow test? Did you perform a fuel pressure test? What condition are your spark plugs in? Have you considered your fuel injectors?

If you are running a full aftermarket exhaust, you absolutely need a tune.
I purchased this bike last weekend, I noticed the problem after I got it home. It runs great until I attempt to clutch up, or go WOT. In better detail, If I am in first - 2nd gear WOT it will feel like I am hitting brakes and engine at same time and there is just no power, but If I back off the throttle and kind of follow the power with the throttle I can still get good acceleration. With more load ( higher speeds ) it reduces the amount of throttle I can give the bike. I will redo the fuel pump flow test, I followed a video but after some research it does not seem entirely accurate. I have considered the fuel injectors, I am waiting to spend the money on getting them cleaned and tested at our local shop.
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post #6 of 27 (permalink) Old 04-24-2017, 07:43 PM Thread Starter
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Just did another flow test, held the starter down for two fifteen second passes and got a little over 1 liter if fuel, is this good? I cannot get ahold of a service manual either so if anyone has a k6 gsxr 600 manual laying around please let me know
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post #7 of 27 (permalink) Old 04-24-2017, 08:04 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

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Originally Posted by Brownrp92 View Post
Just did another flow test, held the starter down for two fifteen second passes and got a little over 1 liter if fuel, is this good? I cannot get ahold of a service manual either so if anyone has a k6 gsxr 600 manual laying around please let me know
Do it the right way, then report back. That is not the right way.
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post #8 of 27 (permalink) Old 04-24-2017, 09:16 PM Thread Starter
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Thanks for the help nick!!!!!! probably would help if I had a service manual, there are several different ways I have seen online to do this so tell me the right way
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post #9 of 27 (permalink) Old 04-24-2017, 09:43 PM Thread Starter
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Update** I adjusted the TPS to the middle, and made sure that the (-)dash in dealer mode only stays at middle or top never going below, it became jerky and gave me little to no power, it sounded horrible, couldent even pull me in 2nd. I brought it back and adjusted it back to all the way up (maxed out the adjustment) so the line never leaves the top. From my knowledge this further confirms a fuel delivery issue. From the looks of the filter(clean) I may be looking at a new pump. If anyone can point me to the rightway on how to test my pump that would be greatly appreciated, the pumps are expensive...

The last test I did was two 15 second bursts(holding the starter down) I was not sure how to wire the fuel pump and didn't have time to track down the solenoid/didnt want to burn out my starter, It came out to be a bit over 1 liter of fuel.
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post #10 of 27 (permalink) Old 04-24-2017, 10:56 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

Quote:
Originally Posted by Brownrp92 View Post
Update** I adjusted the TPS to the middle, and made sure that the (-)dash in dealer mode only stays at middle or top never going below, it became jerky and gave me little to no power, it sounded horrible, couldent even pull me in 2nd. I brought it back and adjusted it back to all the way up (maxed out the adjustment) so the line never leaves the top. From my knowledge this further confirms a fuel delivery issue. From the looks of the filter(clean) I may be looking at a new pump. If anyone can point me to the rightway on how to test my pump that would be greatly appreciated, the pumps are expensive...

The last test I did was two 15 second bursts(holding the starter down) I was not sure how to wire the fuel pump and didn't have time to track down the solenoid/didnt want to burn out my starter, It came out to be a bit over 1 liter of fuel.
You lift up the tank and there is a connector connecting the fuel pump with 3 wires to diconnect. Use some speaker wire or something and hook it up to the battery. It will then pump and you can test it properly.

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post #11 of 27 (permalink) Old 05-16-2017, 03:27 PM Thread Starter
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Hello all, just returned from a three week training. I ended up stealing a friend's bike and I have it untill next week, I swapped out gas tanks and fuel lines and still the same issue. What steps should I take next to solve this issue? I would like to get as much done with this donor bike here as possible. Thanks in advance
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post #12 of 27 (permalink) Old 05-16-2017, 04:05 PM Thread Starter
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Re: K6 600 Bogging under heavy throttle/higher RPM

Swapped ECU's, no difference. Would also like to note that when downshifting it Backfires ALOT and the cold start idle is too low. Thanks all
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post #13 of 27 (permalink) Old 05-16-2017, 04:27 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

I have a feeling the SET valve is not wide open.
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post #14 of 27 (permalink) Old 05-16-2017, 04:36 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

Just keep swapping everything until it works. Might as well swap the throttle bodies and injectors while you're at it.
You can also check the SET valve, but it looks like it's fully open in that photo.
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post #15 of 27 (permalink) Old 05-16-2017, 04:43 PM Thread Starter
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Current spark plugs, I am not good at reading these.

Swapped plugs and coil packs with known good. No noticeable difference.
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post #16 of 27 (permalink) Old 05-16-2017, 05:26 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

Those look a little lean.
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post #17 of 27 (permalink) Old 05-16-2017, 07:46 PM Thread Starter
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So this bike came with 750cc throttle bodies. just checked the engine and it is N which is 600... I put my friends on mine and the TPS is way off throwing a code and I don't want to mess his up too, might try it out tomorrow but im giving up tonight.

MY TB O2HO
DONOR BIKE TB O1HO
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post #18 of 27 (permalink) Old 05-17-2017, 06:41 PM Thread Starter
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just finished playing with the TPS on the 600 throttle bodies.... same issue I literally don't know what to do at this point, it didn't backfire asmuch this time though
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post #19 of 27 (permalink) Old 05-17-2017, 09:00 PM
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Re: K6 600 Bogging under heavy throttle/higher RPM

I don't see it addressed but how are you checking the TPS? Is the engine off or is the bike running?
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post #20 of 27 (permalink) Old 05-17-2017, 09:19 PM Thread Starter
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initially off, I set TPS to center line then rolled the throttle a few times to make sure it didn't go down. Started it and drove it around. It didn't have any power but idles okay. I then maxed it out to line on top and it ran the best. I backed it down after in increments too see how it would take, only making it worse each time.

Last edited by Brownrp92; 05-17-2017 at 09:30 PM.
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