Need help, 2009 GSXR 750 Running Rough - GSXR.com
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post #1 of 24 (permalink) Old 08-17-2019, 03:04 PM Thread Starter
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Exclamation Need help, 2009 GSXR 750 Running Rough

Hello to everyone, new member here
so i have a 2009 Gsxr 750. bike has 9500 miles
list of mods: Two brothers slip on, set valve removed, cat removed, k&n intake air filter, and PC5
the bike has been professionally tuned at a local powersports shop mainly for suzuki sport bikes. bike has been dyno tuned to produce 140 hp to the rear wheel. bike feels like a rocket. i am having a major problem. The other night i was going to my gfs house on the parkway, average speed of 90 mph. i stopped by a gas station and got premium 93 gas. i left my girlfriends house around 2 am. it was around 84 degrees. took the parkway down to another main parkway, average speed of 150 mph. upon slowing down to get on ramp to merge to the second parkway, my bike started to sound like a Harley. sounded like a heavy misfire. i pulled over and it wasidling very rough. barely any power. i tried revving it and it hesitated to go above 4k. i rode the bike home about 14 miles doing 70 and cruising. i decided to bring the bike to my shop, were auto repair mechanics, and the bike was still shitty. passed 8k rpm, the bike takes off and no issues. under that, it idles bad and runs rough. i checked plugs, coils, fuel pump, fuel filter, pair valve, tps sensor -C00, goes up when i rev slightly. i removed injectors and cleaned them. checked plugs for spark. NO FI light is on. tested coils. i am stuck at this point. i tried switching back bikes ecm and removed pc5, still did the same thing. i have no idea what the problem may be, any help will be appreciated. thank you in advance

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post #2 of 24 (permalink) Old 08-17-2019, 03:55 PM
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Did you by some chance get a bad batch of gas? It does happen . Is any fi light on ? Did you run a compression test on the motor? Are all your cylinders firing?
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post #3 of 24 (permalink) Old 08-17-2019, 06:47 PM Thread Starter
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It definitely has to be a batch of gas. Before that the bike was running strong. I emptied the tanks. Pulled fuel pump cleaned that out. Flushed out fuel rail and injectors. Didn’t check compression but bike runs smooth after 8k in all gears. No FI light on. Put fresh gas in and it’s still the same.

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post #4 of 24 (permalink) Old 08-17-2019, 07:23 PM
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So it runs perfect than runs poorly and no power than runs perfect again?

What do you mean by "heavy misfire"? Backfire? Or just cylinder loss?

It would be great if you could catch it while it is doing it and see if one or more of the cylinders were off line.

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If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
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Last edited by rv6john; 08-17-2019 at 07:29 PM.
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post #5 of 24 (permalink) Old 08-17-2019, 07:31 PM Thread Starter
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So it runs perfect than runs poorly and no power than runs perfect again?

What do you mean by "heavy misfire"? Backfire? Or just cylinder loss?
It ran perfect before I got the gas. Then it ran like shit. It’s been running like shit but It idles fine at 1200 rpm. It runs like shit up until second injectors kick on after 8k rpms. It backfires once every few minutes. It feels like a misfire when I rev it around 3k rpm. I’m sorry if I don’t make sense

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post #6 of 24 (permalink) Old 08-18-2019, 04:50 AM
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It idles fine by itself at 1200? Or are you holding the throttle open to achieve that?

I'm trying to figure out if one cylinder is not firing from your description. The idle drops a couple of hundred rpm with one cylinder out but you have an automatic idle control so that could be compensating.

The best guess is that you have one primary injector not working correctly.

Start the bike up cold and check each header to see if one is noticeably cooler than the others. You can squirt them with a water bottle to see the difference as they get hot really fast.

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Originally Posted by Chuckster View Post
If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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post #7 of 24 (permalink) Old 08-18-2019, 05:12 AM Thread Starter
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Quote:
Originally Posted by rv6john View Post
It idles fine by itself at 1200? Or are you holding the throttle open to achieve that?

I'm trying to figure out if one cylinder is not firing from your description. The idle drops a couple of hundred rpm with one cylinder out but you have an automatic idle control so that could be compensating.


The best guess is that you have one primary injector not working correctly.

Start the bike up cold and check each header to see if one is noticeably cooler than the others. You can squirt them with a water bottle to see the difference as they get hot really fast.
Idles by itself at 1200. Start up is normal. Whether it’s cold or warmed up, if I twist the throttle to 3k rpm, it goes prrrrr which sounds like one is misfiring. I will check the temps tomorrow when I get to the shop. Didn’t think of that. Thank you

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post #8 of 24 (permalink) Old 08-19-2019, 07:52 AM Thread Starter
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Originally Posted by rv6john View Post
It idles fine by itself at 1200? Or are you holding the throttle open to achieve that?

I'm trying to figure out if one cylinder is not firing from your description. The idle drops a couple of hundred rpm with one cylinder out but you have an automatic idle control so that could be compensating.

The best guess is that you have one primary injector not working correctly.

Start the bike up cold and check each header to see if one is noticeably cooler than the others. You can squirt them with a water bottle to see the difference as they get hot really fast.
all 4 are around the same temp give or take 10 degrees. tested cold and warmed up after 5 mins.
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post #9 of 24 (permalink) Old 08-19-2019, 08:56 AM
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Quote:
Originally Posted by Baklava View Post
all 4 are around the same temp give or take 10 degrees. tested cold and warmed up after 5 mins.
But still running rough/poorly while you did this check?

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Originally Posted by Chuckster View Post
If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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post #10 of 24 (permalink) Old 08-20-2019, 02:52 PM Thread Starter
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Yes its still running the same, im going to try to upload a video. maybe this will clear it up
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post #11 of 24 (permalink) Old 08-21-2019, 12:19 PM Thread Starter
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here is the post, the low rpms has the most issue at 3k. any help will be appreciated
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post #12 of 24 (permalink) Old 08-21-2019, 12:58 PM
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It starts and idles nicely initially, but when you add throttle it sure sounds like it is going to 3 cylinders.

If it was my bike, I'd start it up and go to that rpm for a minute then check the headers again for a cooler pipe. It has to be a different temperature.

Finding the problem cylinder is the first step to solving the issue. My guess is that you are going to find a partially clogged or sticky injector on that cylinder.

Quote:
Originally Posted by Chuckster View Post
If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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post #13 of 24 (permalink) Old 08-21-2019, 01:01 PM Thread Starter
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alright ill try the temp reading again. maybe i missed something. also, i pulled all 8 injectors and cleaned them. manually sprayed them to check the angle of spray and it has the V spray. probably still continued after cleaning them

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post #14 of 24 (permalink) Old 08-21-2019, 05:08 PM
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I was assuming from the video that the miss is very consistent, ignition problems generally are not.

That is why I suspect fuel.

Quote:
Originally Posted by Chuckster View Post
If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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post #15 of 24 (permalink) Old 08-22-2019, 11:15 AM Thread Starter
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Hope everyone’s day is going great. Tried torquing to 8 ft lbs and she snapped
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post #16 of 24 (permalink) Old 08-22-2019, 12:10 PM
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Sounds like a plug arcing out to ground to me. Closely inspect your plug boots. Might be lucky it just a bad plug, like the broken one in your hand :/... Hope the other end comes out easy with a screw driver. Good luck...

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post #17 of 24 (permalink) Old 08-22-2019, 12:22 PM
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Not good. There were a few posts of spark plugs breaking in that place about a year ago, nothing recently.

Is that an "NGK" plug? There have been some threads floating around about counterfeit NGK plugs and I wonder if that is not one of them?

PLUG STUDIO / NGK

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If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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post #18 of 24 (permalink) Old 08-22-2019, 12:27 PM
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If the spark plug screwed in easily (hand torque) all the way till the gasket seated, the threaded shell should come back out easily with an easy out.

If you had to use a wrench to seat it, it may be a lot harder.

Quote:
Originally Posted by Chuckster View Post
If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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post #19 of 24 (permalink) Old 08-23-2019, 07:09 AM Thread Starter
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Quote:
Originally Posted by Spyder13 View Post
Sounds like a plug arcing out to ground to me. Closely inspect your plug boots. Might be lucky it just a bad plug, like the broken one in your hand :/... Hope the other end comes out easy with a screw driver. Good luck...
even with the new plugs, the misfire still happens. but it did get better. im thinking it may be a coil but it wouldnt explain how it smoothes out at high rpms 8k+. i gotta test them again. the plug boots looked good, no cracked or white marks. im baffled
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post #20 of 24 (permalink) Old 08-23-2019, 07:11 AM Thread Starter
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Originally Posted by rv6john View Post
Not good. There were a few posts of spark plugs breaking in that place about a year ago, nothing recently.

Is that an "NGK" plug? There have been some threads floating around about counterfeit NGK plugs and I wonder if that is not one of them?

PLUG STUDIO / NGK
i hand tighten this and then torqued it, it was 10 ft lbs of torque which i dont understand bc it went all the way in. i didnt try to over tighten it or anything, just twisted till it stopped. they might be fake tho but i got it from a reputable source.

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post #21 of 24 (permalink) Old 08-23-2019, 07:12 AM Thread Starter
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If the spark plug screwed in easily (hand torque) all the way till the gasket seated, the threaded shell should come back out easily with an easy out.

If you had to use a wrench to seat it, it may be a lot harder.

i was able to take it out, took a little effort but were good. the shell looks really cheaply made tho
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post #22 of 24 (permalink) Old 08-23-2019, 07:29 AM
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i was able to take it out, took a little effort but were good. the shell looks really cheaply made tho
Good deal.

Could you post a picture of the cylinder end of the shell? I wonder if it has the rough machine marks as NGK says is indicative of a phony spark plug.

Where did you buy the spark plugs?

Quote:
Originally Posted by Chuckster View Post
If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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post #23 of 24 (permalink) Old 08-23-2019, 08:35 AM Thread Starter
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Advance auto. Big auto parts chain in New York
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post #24 of 24 (permalink) Old 08-31-2019, 08:50 AM Thread Starter
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Fixed

Thank you for all the information and help.
i do not know what was the problem, i do not know what the fixed was. the bike is running strong again. i have a feeling it was the shitty gas that didnt burn off. 3 fill up of premium at a mobil 1 gas station. its running perfectly fine. if anything changes, i will let you know
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