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Uses squid tentacles as a butt-plug
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Discussion Starter #1
SO sometimes I do bad things on a back road highway of sorts. I use it to open up my bike every once an a while. Two months ago I indicated 185 I believe GPS said about 168. Then I was cruising last week at about 143 GPS. Today I lubed the clutch cable ( cable lube tool from other post worked AMAZING) took her out to open her up. Brand new stingray vett pulled up beside me on this highway and motioned to "speed up a bit". I was in 6th gear I kicked her down to third rapped it out, hit 4th and noticed it hesitated to move past 13k as he pulled ahead of me I hit 5th which didn't want to pull past 12k now hes far ahead of me, which he SHOULD NOT be, I kicked 6th and twisted. 12k is where she stopped... 122 mph gps was the best she had. Almost like some weird governer at 122. The things I noticed that I don't think would effect it but thought I would put out were:

1.Gas light is on low gas indicated (not sure if this was the same the first time but definitely the second time)
2. Quite a bit of wind ( definitely both time a good amount of wind very flat land where I'm riding.)
3. Full exhaust installed no dyno no ECU controller or mapping (bought the bike this way has never effected it before.)

"You shouldn't be going that fast on public roads" yea yea yea I don't do this daily just when I adjust something or want to clean her out, and the track is VERY far from me and my skill on the track is not there enough to justify spending the cash right now.

Any ideas guys ? Also anyone know a good place near phoenix AZ to dyno?
 

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Have you checked the pump to see if its maintaining the correct pressure and giving the engine the right amount of fuel it needs?the result is an incorrect engine mixture of fuel and air
 

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Also general maintenance on "her"😁 is very I'mportant. Bad gas or clogged fuel filter, improper oil level or a dirty air filter could result in loss of power drastically in your machine.
 

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Uses squid tentacles as a butt-plug
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Discussion Starter #4
Also general maintenance on "her"😁 is very I'mportant. Bad gas or clogged fuel filter, improper oil level or a dirty air filter could result in loss of power drastically in your machine.
Just replaced the entire pump and assembly recently. I thought this too but its very subtle and only after 122mph it doesn't bog down at all just acts like there is no more to give. I thought maybe the filter is clogged but doesn't the engine get the same amount of fuel at 14k in any gear? it has no problem 1st through 3rd and only stops at 12k in 4th through 6th but doesn't bog. Im gunna pull the fuel pump assemb this weekend and clean the filter but outside of that im lost.:eek:
 

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Did you clean the screen on the fuel petcock? Remove the tank,turn it sideways so fuel doesn't come out, remove it and blow it out with compressed air. It could be a cogged jet in the carbs too..



Are you the original owner to the bike? Other then opening it up on lengthy open roads when u go out for a braaap how hard are you riding?I have heard that a warn out clutch plate could cause similar issues.
 

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I know things... A lot of things.
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Just replaced the entire pump and assembly recently. I thought this too but its very subtle and only after 122mph it doesn't bog down at all just acts like there is no more to give. I thought maybe the filter is clogged but doesn't the engine get the same amount of fuel at 14k in any gear? it has no problem 1st through 3rd and only stops at 12k in 4th through 6th but doesn't bog. Im gunna pull the fuel pump assemb this weekend and clean the filter but outside of that im lost.:eek:
Unless the pump assembly was new and OEM, it doesn't necessarily mean that the flow should be ok. And even in that case, bad fuel can clog the strainer so, generally, the only way to tell, is to measure. Engine fuel consumption generally depends on engine speed and throttle opening, so you might not giving it as much throttle in the lower gears, but even if you do, smaller power output in the first gears would still allow the bike to accelerate to redline. At higher speeds the wind resistance might not allow it to do so.

Another possibility for lower power output at higher engine speeds and loads, which did feel like a premature top speed in my case, would be worn spark plugs.
 

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Uses squid tentacles as a butt-plug
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Discussion Starter #8
Did you clean the screen on the fuel petcock? Remove the tank,turn it sideways so fuel doesn't come out, remove it and blow it out with compressed air. It could be a cogged jet in the carbs too..



Are you the original owner to the bike? Other then opening it up on lengthy open roads when u go out for a braaap how hard are you riding?I have heard that a warn out clutch plate could cause similar issues.
I've got an K4 hence why its posted in the 04-05 spot so no carbs here buddy and I've never herd of a clutch plate causing issues like this....
Unless the pump assembly was new and OEM, it doesn't necessarily mean that the flow should be ok. And even in that case, bad fuel can clog the strainer so, generally, the only way to tell, is to measure. Engine fuel consumption generally depends on engine speed and throttle opening, so you might not giving it as much throttle in the lower gears, but even if you do, smaller power output in the first gears would still allow the bike to accelerate to redline. At higher speeds the wind resistance might not allow it to do so.

Another possibility for lower power output at higher engine speeds and loads, which did feel like a premature top speed in my case, would be worn spark plugs.
Understood on the assembly. I only use OEM parts where they are available however it was gently used and has a warranty on it. It has caused no problems in the last two months since install I would be hesitant on thinking it was this part. Now spark plugs on the other hand could be the culprit the previous and original owner never changed anything just let it run so this is a good possibility. Another possibility which I was going to check this weekend is the strainer being clogged. When I replaced the assemb I noticed rust and a bunch of other shit in the tank. I cleaned it out best I could (turkey baster....) and when on my way got most out but the strainer might be clogged now.
 

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Dreaming of buttsecks for years...
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I thought maybe the filter is clogged but doesn't the engine get the same amount of fuel at 14k in any gear?
It's not going the same speed at 14k in any gear, right? It's a matter of work being done. 14k in 2nd gear is a lot slower than 14k in 5th. In 5th, you're going to be pushing a whole lot more wind, more rolling resistance, etc. It needs far more energy, and that comes from fuel. That's why all these "bogged down" threads all read the same way.... problems present in higher gears and higher RPMs.
 

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Uses squid tentacles as a butt-plug
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Discussion Starter #10
It's not going the same speed at 14k in any gear, right? It's a matter of work being done. 14k in 2nd gear is a lot slower than 14k in 5th. In 5th, you're going to be pushing a whole lot more wind, more rolling resistance, etc. It needs far more energy, and that comes from fuel. That's why all these "bogged down" threads all read the same way.... problems present in higher gears and higher RPMs.
Thank you for explaining that. I had a hunch but wasn't sure and it makes sense, engine works harder needs more food. So at this point I'm pulling my assemb tonight and cleaning the strainer and checking the plugs ill update after a test.
 

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Dreaming of buttsecks for years...
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Why don't you test it to see if that's the problem before you start trying to correct a problem you're not even sure exists?
 

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Uses squid tentacles as a butt-plug
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Discussion Starter #12
Why don't you test it to see if that's the problem before you start trying to correct a problem you're not even sure exists?
Test what ? I know the strainer needs to be cleaned that was on my to-do list regardless and the plugs should have been checked when I bought the bike which I didn't. Im not changing anything or buying any parts aside from plugs if they are badly fouled.
 

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Disregarding differences in gear-dependent mapping and ram-air effects, an engine going at a certain throttle opening and a certain speed, will consume the same fuel and produce the same power regardless of gear. Of course at higher gears, the higher wind drag, rolling resistance, etc. will result in lower acceleration as more work has to be done against them. I suspect most fuel starvation issues manifest at higher gears because lower gears don't allow WOT so readily, either because the bike will drift the rear wheel, or wheelie, or because of psychological factors.
 

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Uses squid tentacles as a butt-plug
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Discussion Starter #14
Disregarding differences in gear-dependent mapping and ram-air effects, an engine going at a certain throttle opening and a certain speed, will consume the same fuel and produce the same power regardless of gear. Of course at higher gears, the higher wind drag, rolling resistance, etc. will result in lower acceleration as more work has to be done against them. I suspect most fuel starvation issues manifest at higher gears because lower gears don't allow WOT so readily, either because the bike will drift the rear wheel, or wheelie, or because of psychological factors.
Now I am confused. Hahaha what do you think the issue could be?
 

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You're bike hasn't been in the vicinity of any two bros products has it? Lol
Sounds like you're on the right track with cleaning the filter and checking the plugs. That would be my first step as well.
 

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Uses squid tentacles as a butt-plug
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Discussion Starter #16
You're bike hasn't been in the vicinity of any two bros products has it? Lol
Sounds like you're on the right track with cleaning the filter and checking the plugs. That would be my first step as well.
Full yoshi all day everyday. I used a two bros once to prop my bike up :lmao
 

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You know, if you had these issues on track, I would be glad to help you out with some ideas but you did this on public roads with speed limits. Your bike has a potential issue that needs to be fixed, but fuck-right-off.

You addressed this issue of the speed difference and you asked not to be disparaged... but that was fucking stupid. Maybe that issue might save your life.
 

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Now I am confused. Hahaha what do you think the issue could be?
My comments had more to do with physics, than with your issue. If you're concerned about why you're only noticing the problem in higher gears, it might be that the reduced power output is not so noticeable in the lower gears, as it will result in lower acceleration, which doesn't stand out as much as a lower top speed, or it might be that you're inadvertently not opening the throttle as much in the lower gears (which can happen easier than one might think).

Your description of the problem in the OP is a bit confusing, as I'd think you'd be going faster than 122 mph at 12K rpm and 6th gear (assuming stock gearing), but, at any rate, if you can't redline the 4th gear, you're producing a lot less power than you should. That might be due to fuel starvation, which you should check by measuring the flow produced by the pump, bad spark, which you should initially check by inspecting and/or replacing the spark plugs, or other issues, which you should consider only after making sure the usual problems mentioned above are not causing your problem.
 

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Dreaming of buttsecks for years...
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Test what ? I know the strainer needs to be cleaned that was on my to-do list regardless and the plugs should have been checked when I bought the bike which I didn't. Im not changing anything or buying any parts aside from plugs if they are badly fouled.
Test to see if you have a fuel delivery issue.
 

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Uses squid tentacles as a butt-plug
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Discussion Starter #20
My comments had more to do with physics, than with your issue. If you're concerned about why you're only noticing the problem in higher gears, it might be that the reduced power output is not so noticeable in the lower gears, as it will result in lower acceleration, which doesn't stand out as much as a lower top speed, or it might be that you're inadvertently not opening the throttle as much in the lower gears (which can happen easier than one might think).

Your description of the problem in the OP is a bit confusing, as I'd think you'd be going faster than 122 mph at 12K rpm and 6th gear (assuming stock gearing), but, at any rate, if you can't redline the 4th gear, you're producing a lot less power than you should. That might be due to fuel starvation, which you should check by measuring the flow produced by the pump, bad spark, which you should initially check by inspecting and/or replacing the spark plugs, or other issues, which you should consider only after making sure the usual problems mentioned above are not causing your problem.
Test to see if you have a fuel delivery issue.
Its a damn fuel delivery issue AGAIN. The housing reservoir cracked again somehow. I don't have the time to delve into this further I think the strainer is getting clogged and causing a vacuum of sorts and cracking the reservoir. In any regards ill replace it again and sell the bike, I've got another project I'm looking at haha.
 
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