Rpms won't go higher than 8k - Page 2 - ZX6R Forum
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post #16 of 75 Old 07-20-2016, 10:00 AM
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Could be fuel pump. Check in your tank and with a flashlight, check for any rust or debris. If there is gunk in there, could be your issue.


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post #17 of 75 Old 07-20-2016, 10:16 AM Thread Starter
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Originally Posted by DFx View Post
Could be fuel pump. Check in your tank and with a flashlight, check for any rust or debris. If there is gunk in there, could be your issue.
I will definitely check that after I test it without the PC connected. the reason i'm doubting its the pump is that the revs stop precisely on 8k rpms no matter what gear. the bike doesn't struggle when it gets to 8k and it doesn't bounce at all. It seems like it'd most likely be the pc. but, i can't say for sure. i'm just hoping because i hear fuel pumps are expensive.
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post #18 of 75 Old 07-20-2016, 11:01 AM
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Don't rule out the fuel pump just because it stops exactly at 8k RPM. One of my bikes would stop at the exact RPM as well. I ruled out the fuel pump because I thought there is no way it was the fuel pump since it stopped at the exact same RPM. Come to find out weeks later after pulling out all of my hair that it was the fuel pump.

I would check the system in this order
1) Power commander
2) Fuel Pump and lines
3) Ignition coil, wires and plugs (resistance are within spec)
4) Gas tank vent and flow (is it venting properly, unrestricted)
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post #19 of 75 Old 07-20-2016, 11:03 AM Thread Starter
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Originally Posted by Sabotage View Post
Don't rule out the fuel pump just because it stops exactly at 8k RPM. One of my bikes would stop at the exact RPM as well. I ruled out the fuel pump because I thought there is no way it was the fuel pump since it stopped at the exact same RPM. Come to find out weeks later after pulling out all of my hair that it was the fuel pump.

I would check the system in this order
1) Power commander
2) Fuel Pump and lines
3) Ignition coil, wires and plugs (resistance are within spec)
4) Gas tank vent and flow (is it venting properly, unrestricted)
no, for sure i'm not ruling it out. thanks for the tip on the order of checking the system. I'll give an update soon
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post #20 of 75 Old 07-20-2016, 11:18 AM Thread Starter
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Originally Posted by Sabotage View Post
Don't rule out the fuel pump just because it stops exactly at 8k RPM. One of my bikes would stop at the exact RPM as well. I ruled out the fuel pump because I thought there is no way it was the fuel pump since it stopped at the exact same RPM. Come to find out weeks later after pulling out all of my hair that it was the fuel pump.

I would check the system in this order
1) Power commander
2) Fuel Pump and lines
3) Ignition coil, wires and plugs (resistance are within spec)
4) Gas tank vent and flow (is it venting properly, unrestricted)
did you have to replace your fuel pump? how much do they run?
i have seen a few equivalent fuel pumps on ebay for pretty cheap $30-60. They aren't sold as a complete assembly. All parts to put together yourself. Should I stay away from those?
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post #21 of 75 Old 07-20-2016, 11:34 AM
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I bet it is the kickstand sensor. I have seen the same issue with a few buddies. Same thing sensor was loose and would stall out at a certain rpm. I think it would go to around 9-10 grand.

Dude.....you're about to get roasted. You pour soul
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post #22 of 75 Old 07-20-2016, 11:41 AM
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Remove the power commander, the full exhaust wont cause an issue just to rule it out. The "low power" answer is stupid btw, the seller is an idiot and it sounds like he sold you a fucked up bike. Even if the power commander lost the tune, it will go to a 0 tune, not some imaginary "low power mode".
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post #23 of 75 Old 07-20-2016, 11:46 AM Thread Starter
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Originally Posted by BrandonZX6r View Post
I bet it is the kickstand sensor. I have seen the same issue with a few buddies. Same thing sensor was loose and would stall out at a certain rpm. I think it would go to around 9-10 grand.
i will see if it's that as well. but the bike doesn't stall out at 8k, it continues to move
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post #24 of 75 Old 07-20-2016, 11:47 AM Thread Starter
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Remove the power commander, the full exhaust wont cause an issue just to rule it out. The "low power" answer is stupid btw, the seller is an idiot and it sounds like he sold you a fucked up bike. Even if the power commander lost the tune, it will go to a 0 tune, not some imaginary "low power mode".
gotchya. yeah the seller did say he was referring to the ecu, not the power commander. and then went on to say it could be a sensor, yadda yadda.

so yeah removing the pc tonight. will udpate
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post #25 of 75 Old 07-20-2016, 11:53 AM
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i will see if it's that as well. but the bike doesn't stall out at 8k, it continues to move
It is definitely not the kickstand sensor, I am not sure what RPM the secondary injectors are supposed to kick in but this may be a possibility as well.
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post #26 of 75 Old 07-20-2016, 12:19 PM
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It is definitely not the kickstand sensor, I am not sure what RPM the secondary injectors are supposed to kick in but this may be a possibility as well.
Manual says 5500 rpm. I dont think thats correct though. I remember mine kicking in at 8K. Its been a while tho so I could be wrong

Last edited by Scorpi0; 07-20-2016 at 12:24 PM.
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post #27 of 75 Old 07-20-2016, 12:24 PM Thread Starter
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8K they should kick in.
and the power commander is in between the ecu and secondary injectors. as far as i can see and understand anyway. so it would make sense if the power commander is fucked up and the secondary injectors are being mislead.

again, i don't know shit. but i really like working on the bike so far. even the little i have done. opening her up and learning how she works. i have so much to learn, but i'm a very visual learner, so i like this stuff a lot.
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post #28 of 75 Old 07-20-2016, 12:27 PM
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Yeah man maintenance is fun. If I am bored and I stare at my bike for too long I will end up finding something to mess around with lol.

Anyway, fully disconnect the power commander. U want the bike to be running on its original ECU only.
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post #29 of 75 Old 07-20-2016, 12:32 PM
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Also, since u have the bike apart. An easy way to check the secondary injectors is to remove the air filter and look inside with a flashlight and mirror. Start the engine and rev the bike to 8K RPMs. They should have came on at that point. If not, then thats a problem.
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post #30 of 75 Old 07-20-2016, 12:51 PM Thread Starter
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Originally Posted by Scorpi0 View Post
Also, since u have the bike apart. An easy way to check the secondary injectors is to remove the air filter and look inside with a flashlight and mirror. Start the engine and rev the bike to 8K RPMs. They should have came on at that point. If not, then thats a problem.
got it. will do
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