K5 not running properly - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #1 of 25 (permalink) Old 04-17-2019, 10:07 AM Thread Starter
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K5 not running properly

Hey guys, after winter my bike is not running properly. Bike won't idle (dies if not using throttle), revs quite poorly and has a sound of diesel engine.

I have changed the plugs and checked the timing. Exhaust heads will heat up and engine will fire up instantly if applying throttle at the same time.

Any advice what to check next? Thanks!
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post #2 of 25 (permalink) Old 04-17-2019, 10:16 AM
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Re: K5 not running properly

First, please go introduce your self in the "Starting Line" section and tell us about yourself!

Some things that come to mind are fuel injectors and the fuel pump. Since it is somewhat running, you could try to run some seafoam through it and see if that helps clear it up if the injectors are gunked up
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post #3 of 25 (permalink) Old 04-17-2019, 10:40 AM
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Re: K5 not running properly

Did you look to see if your fuel tank rusted?
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post #4 of 25 (permalink) Old 04-17-2019, 10:50 AM
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Re: K5 not running properly

When I hear "diesel engine", that suggest knocking like a blown connecting rod but I'm more inclined to believe you're running on 3 cylinders, which makes the bike sound like shit and do everything you're describing. If you've changed the plugs, possibly a coil went south.

Very easy to check - when you say exhaust heats-up, did you check all 4? Rather than running it like that, I'd pull the plugs and just check each for spark.


Pull out your phone and record a quick video.
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post #5 of 25 (permalink) Old 04-17-2019, 11:09 AM
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Re: K5 not running properly

Do you see FI flashing on the dash? Also, how does the engine perform under load? Can you ride the bike and if so, does the engine operate better or worse at larger throttle openings?
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post #6 of 25 (permalink) Old 04-17-2019, 11:59 AM
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Re: K5 not running properly

This issue is not mechanical. I would bet tree fiddy that you didn't use a battery tender during storage, right? Test your battery voltage. These bikes run basically on battery power when at idle.
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post #7 of 25 (permalink) Old 04-17-2019, 12:36 PM
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Re: K5 not running properly

Check the rear tire pressure and make sure your blinker fluid is topped-off.
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post #8 of 25 (permalink) Old 04-17-2019, 03:55 PM
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Re: K5 not running properly

Check vacuum lines Mate if not clogged with condensation! Seriously...
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post #9 of 25 (permalink) Old 04-17-2019, 04:39 PM Thread Starter
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Re: K5 not running properly

I will do those things tomorrow. All 4 heads were warming up instantly (but sounds like running on 3 cylinders). When giving throttle engine is working better after some jerkiness but you have to give some throttle constantly. I charged the battery couple of times but i will check it also.
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post #10 of 25 (permalink) Old 04-17-2019, 04:48 PM
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Re: K5 not running properly

Start with vacuum lines, diconnect from Manifold Air Pressure sensor and blow into them, if You feel resistance there's water/residue in those lines and your MAP sensor tells rubbish to the CPU and it does not run the engine right... the proper blow through may clear them and the bike will start normal however You still need to clean them or replace them (don't go for original ones if You do, they're bloody expensive...)
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post #11 of 25 (permalink) Old 04-17-2019, 09:52 PM
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Re: K5 not running properly

Quote:
Originally Posted by Kartel View Post
Start with vacuum lines, diconnect from Manifold Air Pressure sensor and blow into them, if You feel resistance there's water/residue in those lines and your MAP sensor tells rubbish to the CPU and it does not run the engine right... the proper blow through may clear them and the bike will start normal however You still need to clean them or replace them (don't go for original ones if You do, they're bloody expensive...)
I would also start with these. Try disconnecting the IAP sensor's connector first. If bike runs better, then the vacuum lines are clogged.
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post #12 of 25 (permalink) Old 04-18-2019, 04:25 AM
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Re: K5 not running properly

+1 on the vacuum lines if the motor runs better with more throttle. You can probably test them by seeing if running with the IAPS disconnected makes the problem go away, or otherwise significantly changes engine operation.
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post #13 of 25 (permalink) Old 04-18-2019, 11:16 AM Thread Starter
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https://youtu.be/4YX6dwIzBFA
Link to the video. Im not touching the throttle when bike dies. Airbox is off in the video. Vaccuum line seemed to be ok and no difference betweem airbox or without. Bike has also xtre.
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post #14 of 25 (permalink) Old 04-18-2019, 11:35 AM Thread Starter
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There was also short hizzing (pressure release) sound which can be seen at the beginning of the video.
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post #15 of 25 (permalink) Old 04-18-2019, 12:13 PM
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Re: K5 not running properly

That's definitely all 4 cylinders. I'm leaning towards @dpapavas
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post #16 of 25 (permalink) Old 04-18-2019, 12:18 PM
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Re: K5 not running properly

Disconnect the xtre for now. What is the idle speed once warmed up? I guess the answer is 0 RPM if it won't idle but it should try to idle at some RPM before dying. Have you been fiddling with either the idle or fast idle screws or the TP sensor mounting screw? Can you see the secondary throttle and, more significantly, the cam on the end of the secondary throttle shaft move to the fast idle position when you turn the ignition on to start it? You should also be able to see the cam rotate to the normal position after running for 30 seconds or so. The bike should idle at 1200 RPM (by the tach) and the TP sensor should be set to the middle position per 4-20 of the service manual. I don't hear either a diesel sound or a "hizzing" sound in your video. The gas cap will make a sound shortly after a ride that I think is the vent operating (mine is an E33, don't know if other models do this).

Last edited by BillV; 04-18-2019 at 12:46 PM. Reason: Minor updates
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post #17 of 25 (permalink) Old 04-18-2019, 12:27 PM
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Re: K5 not running properly

Quote:
Originally Posted by BillV View Post
Disconnect the xtre for now. What is the idle speed once warmed up? Have you been fiddling with either the idle or fast idle screws? Can you see the secondary throttle and, more significantly, the cam on the end of the secondary throttle shaft move to the fast idle position when you turn the ignition on to start it. You should also be able to see the cam rotate to the normal position after running for 30 seconds or so. The bike should idle at 1200 RPM (by the tach) and the TP sensor should be set to the middle position per 4-20 of the service manual. I don't hear either a diesel sound or a "hizzing" sound in your video. The gas cap will make a sound shortly after a ride that I think is the vent operating (mine is an E33, don't know if other models do this).
Yes ALL models should vent and make that sound I was quite confused my first time as well then realized it was coming from my cap.
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post #18 of 25 (permalink) Old 04-18-2019, 01:25 PM
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Re: K5 not running properly

Quote:
Originally Posted by jamuha View Post
https://youtu.be/4YX6dwIzBFA
Link to the video. Im not touching the throttle when bike dies. Airbox is off in the video. Vaccuum line seemed to be ok and no difference betweem airbox or without. Bike has also xtre.
Did you disconnect the sensor?
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post #19 of 25 (permalink) Old 04-18-2019, 02:18 PM Thread Starter
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Re: K5 not running properly

IAPS was disconnected on that video. Throttle valves move as they should be and i adjusted TP sensor last year.
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post #20 of 25 (permalink) Old 04-18-2019, 05:25 PM
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Re: K5 not running properly

You mean Manifold Air Pressure Sensor connecting to vacuum lines not the one under the seat which is Atmospheric Air Pressure Sensor... right? And You removed the little rubber hose off it Correct?...
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