Need Help Bike shuts off at idle, and feels like it has two powerbands

[Hubn]

hi everyone, my bike recently startet to shut off in neutral (after a few minutes) at red lights and it accelerates weird in 3rd and 4th gear.
It jerks forward in 3rd and 4th gear when i rev it past 7k rpm.

I suspect it might be a clogged fuel filter, but i'm not really sure and just wanted to ask if someone had the same problem.
Im not really experienced with working on bikes, so i'd be very thankfull for every suggestion.

Thanks in advance

 

[1JZSupra]

Have you installed any modifications at all?

 

[Hubn]

Have you installed any modifications at all?

Nope, my rc is completely stock

 

[Hubn]

Ok, so i fixed the crack in the airbox, that everyones pre 2017 RCs have, reseated the sparkplug connector and cleaned the y connector of the tank vent lines. And that fixed the problem. I think it was the spark plug boot.
Here is the Y-connector in question

And thats the crack i mean

checking the sparkplug connection is pretty easy, you just have to take the tank off the bike

hope it helps someone

 

[1JZSupra]

I've had that exact same issue twice. I replaced my intake with something else because of it.

 

[Hubn]

I've had that exact same issue twice. I replaced my intake with something else because of it.

ive heard that the new ones (2017-) dont crack, at least my dad's 2019 is alr atm
i really hope that the epoxy holds up, it seems to be an issue with tension within the mold and not the pressure of the air so...

 

[1JZSupra]

It won't. I used JB weld and it still cracked

 

[Hubn]

It won't. I used JB weld and it still cracked

I think I'm gonna look for a 2nd gen airbox, cos they aren't as linient with mods in Austria, so throwing something custom on it isn't really an option.
But yall aperantly ride around without plates, so mods don't seem to be the biggest problem of the authorities

 

[1JZSupra]

Yeah you guys get defected over there for everything lol

 

[Hubn]

It won't. I used JB weld and it still cracked

you were right, it cracked again

 

[dhynz]

Ok, so i fixed the crack in the airbox, that everyones pre 2017 RCs have, reseated the sparkplug connector and cleaned the y connector of the tank vent lines. And that fixed the problem. I think it was the spark plug boot.View attachment 7200
Here is the Y-connector in question
View attachment 7201
And thats the crack i mean

checking the sparkplug connection is pretty easy, you just have to take the tank off the bike

hope it helps someone

What do you mean by reseated the sparkplug connector? and does cleaning the tank vent lines really help? and i found the my new airbox I replaced just a month ago got cracked at the hose area

 

[Hubn]

What do you mean by reseated the sparkplug connector? and does cleaning the tank vent lines really help? and i found the my new airbox I replaced just a month ago got cracked at the hose area

My sparkplug connector got loose, i suggest you pull the sparkplug out and check if you put the booz on with enough force (you have to really twist it on) also, the y connector is manufactured pretty badly by ktm and temds to clog up. The airbox is probably a lost cause, at least for pre 2019 models. But the airbox shouldn't be a problem. The only thing that crack impacts, is the tiny bit of oil that would be vented out of the valve cover anyway, is getting a bit earlier out of the system

 

[dhynz]

Thank you, will try it out and update.
Before the fix did you have issues like backfiring during deceleration and missing while idle (like the rpm is contact at 1.8-2k rpm but it’s like when there is not spark at a certain stroke of combustion)
If not what was ur exact problem u were facing? I am facing like when i give a sudden throttle at 4k rpm on every when the power flatens out and after 7k rpm the bike start to pull and i can feel the bike is pulling. Is thia was your issue?

 

[Hubn]

I had exactly your problems.
If, what i did, doesn't work for you, it might be a faulty coil or sparkplug wire, but i dont think thats your problem.

Your issues are either fuel or spark related, just keep that in mind

 

[dhynz]

I had exactly your problems.
If, what i did, doesn't work for you, it might be a faulty coil or sparkplug wire, but i dont think thats your problem.

Your issues are either fuel or spark related, just keep that in mind

Thank you man!
Will fix it and update you soon

 

[B7ACKTHORN]

My sparkplug connector got loose, i suggest you pull the sparkplug out and check if you put the booz on with enough force (you have to really twist it on) also, the y connector is manufactured pretty badly by ktm and temds to clog up. The airbox is probably a lost cause, at least for pre 2019 models. But the airbox shouldn't be a problem. The only thing that crack impacts, is the tiny bit of oil that would be vented out of the valve cover anyway, is getting a bit earlier out of the system

Do keep a tab on that Y connector, they clog up fast and in worse conditions the overflow fuel or water from the fuel tank can bypass their way to the coolant reservoir over flow tube and end up in the coolant reservoir sucked by the radiator which would mean pump seal failure and blown head gasket. The Y connector connects the drain from the coolant expansion tank and the fuel tank overflow tank, so it's a pretty clever yet crappy design, talk about tight spaces they were dealing with.

 

[1JZSupra]

The air box thing is just annoying. I replaced my entire ignition system with an MSD system.

 

[dhynz]

Bro it didn't solve the problem i removeD the spark plug connector and replugged it and locked the rubber cap in place it doesn't have any changes SOMEONE PLS HELP!!

 

[1JZSupra]

Did you test for spark like a lot of people suggested

 

[dhynz]

how to test spark bro? i have no idea about it also it a new spark plug and ignition coil