[Andri mamm]

Hello,

I am having trouble with K3 gsxr 1000, bike turns on and drives well, but when i cruise on 5000 rpm the bike switches off, instruments as well the engine turns off when it goes below 5 like 4.5 rpm everything turns back on, also when i go faster over the 5000 rpm everything works. Any suggestions what to check ?

 

[TwistedMister]

hmmm... welp considering you asked imma suggest yo get the service manual and familiarize yourself with the systems,mainly the emissions and ECU

the only thing that makes this bike even partially difficult is the emissions/ECU components, it's like a computerized system, they all talk to each other nonstop, checking each component is working 100% and adjusting air/fuel mixtures

when you key on and the pump primes and needle sweeps that's the efl check telling itself all is good to go, fire up and be off with your bad self..

IF, something is amiss 95% of the time you will get a CHEK light after the self check meaning you need to pull codes and service said component..

you can get this code riding, like flip your kill switch when going down the road then flip it back on, leave key on.. after switching back to run you should get a "check" in the dash cuz it didn't pass the self check as one or several of the components were left out in the start process, you basically push started it and it's letting you know her this bike didn't start normally... THIS is the check to see of the self check is properly working as intended..

having said that the system can be simple as in a dirty side stand switch to complicated, something amiss in the ECU itself that sneaks by the self check but still causes issues, about 50% of the time it's a sensor something straightforward, fuel pressure/flow so forth..

get the manual, familiarize yourself with the system, and components, go to troubleshooting and follow their steps.. they are very good at diagnosing problems using known symptoms, "power loss at speed" so forth..

off the cuff I would say, check for any codes that mean dealer mode, very simple, around the back seat left side towards the front is the connector, has a rubber cover, locate.. the 4 hole connector that has only 2 wires running into it.. jump with paper clip, tape the exposed areas of clip so bare metal doesn't hit metal and ground out.. turn key on, codes will appear on clock..

start there, if nothing go onto fuel flow test.. fairly simple there..

keep going over the system till it pops up, might be very simple as in a emissions sensor that put the ECU in limp mode or a very difficult gremlin that hides well..

you've performed all the obvious right, spark plugs, air filter, new oil filter, new top grade oil... right? give a general inspection with panels removed, make sure nothing is disconnected, chaffed, broken, split, disconnected, so forth

also is it a SPEED related issue as in when you hit a certain speed, or is it RPM related as in when you hit a certain RPM, how does it cruise over 5000 RPM in 1st? 2nd? 3rd? 4th? 5th? so forth.. is is MPH related, or RPM related?

 

[BillV]

That sounds like a sympathetic vibration somewhere. My best guess is that it involves the kickstand and the associated switch. Look for a worn pivot or missing spring (there are two). You could rig up a switch bypass to check if it's really the problem.

Could also be in the kill switch, which is exposed to handlebar vibrations, or maybe the ignition switch.

You say it cuts out at 5000 RPM but is OK at higher values. So how do you get there? Are you being towed?

 

[Andri mamm]

That sounds like a sympathetic vibration somewhere. My best guess is that it involves the kickstand and the associated switch. Look for a worn pivot or missing spring (there are two). You could rig up a switch bypass to check if it's really the problem.

Could also be in the kill switch, which is exposed to handlebar vibrations, or maybe the ignition switch.

You say it cuts out at 5000 RPM but is OK at higher values. So how do you get there? Are you being towed?

No i am just going over it with speed when i wont let the throttle off at 5000 rpm it is fine, it will drive but as soon as i let it stay on 5000 rpm for second or two it instantly shuts it self down and goes back on when it goes under 5000