Posts
325
Joined
12/1/2018
Location
FL
US
Edited Date/Time
2/3/2019 6:24am
Hello guys,
I'm a beginner rider, I don't rip my bike hard.
My bike fires with 2 kicks when cold. It can idle for 2 minutes and it will shut down by itself and then It won't let me kick start without choke. After riding for a couple min' it wants to shut down when reaching low rpm and won't respond to opening throttle and have a delay, then it will respond and give power. But something is definitely weird.
I gave a friend a small test lap and he only felt it once.
When the bike is hot, it will start with 1 small kick, when I put into 1st while clutch is pulled all the way in, I rev it a little and it shuts down without releasing the clutch. I can ride it if I throw the clutch a bit and rev higher, but I never had this issue before.
also while riding, it randomly wants to shut down, like it's choking or not getting fuel (usually happens in low rpm). If I rev it, it goes back to normal. I've had this happen even in 5th gear going downhill without throttle, getting to the end of the downhill with low rpm the bike losing power and won't respond to throttle opening and shutting down. I can kick it and continue to ride but it will happen again randomly.
The first time I noticed something is wrong was when I went wide open in 5th gear and felt for a split second like there was a cut in fuel / air and then it kept going as normal. But since that day, it's been worse each time. Not sure what's the problem.
It's a brand new 2018 KX250F from the dealer. I've done +30 hour. Never done valve clearance yet. Will do next week, but don't know if it's related, because the bike starts with first kick, but acting weird when riding.
EDIT: The issue is the air temp sensor.
Bad wires / not sitting properly / sensor wobbles.
I'm a beginner rider, I don't rip my bike hard.
My bike fires with 2 kicks when cold. It can idle for 2 minutes and it will shut down by itself and then It won't let me kick start without choke. After riding for a couple min' it wants to shut down when reaching low rpm and won't respond to opening throttle and have a delay, then it will respond and give power. But something is definitely weird.
I gave a friend a small test lap and he only felt it once.
When the bike is hot, it will start with 1 small kick, when I put into 1st while clutch is pulled all the way in, I rev it a little and it shuts down without releasing the clutch. I can ride it if I throw the clutch a bit and rev higher, but I never had this issue before.
also while riding, it randomly wants to shut down, like it's choking or not getting fuel (usually happens in low rpm). If I rev it, it goes back to normal. I've had this happen even in 5th gear going downhill without throttle, getting to the end of the downhill with low rpm the bike losing power and won't respond to throttle opening and shutting down. I can kick it and continue to ride but it will happen again randomly.
The first time I noticed something is wrong was when I went wide open in 5th gear and felt for a split second like there was a cut in fuel / air and then it kept going as normal. But since that day, it's been worse each time. Not sure what's the problem.
It's a brand new 2018 KX250F from the dealer. I've done +30 hour. Never done valve clearance yet. Will do next week, but don't know if it's related, because the bike starts with first kick, but acting weird when riding.
EDIT: The issue is the air temp sensor.
Bad wires / not sitting properly / sensor wobbles.
Make sure your idle is at 1800-2000 rpm. If its too low youll have issues. Theres a knob on the throttle body, turn it and it will change your idle speed. Its the “choke” knob you were referring to.
Throw in a new spark plug.
Check all your electrical connections. Clean them with electrical contact cleaner and use some dielectric grease on the plugs.
Sounds like a fuel pump or fuel injector issue to me though.
Sometimes when the temp sensors are broken it can cause that type of issue too.
If youre new, try to find an experienced mechanic to help you. Start with the cheapest stuff first. Fuel pumps are $350 and injectors are around $100. Dont want to see you throw money down the drain.
Try not to log the engine down in 5 th gear when it needs to be in 3rd or 4th gear.
Paw Paw
If it's the TPS, how come this issue only started 3 engine hours ago?
Why does the bike shut down when putting in 1st with clutch in and rev a little without releasing the clutch?
The Shop
Just something "clogged" or I don't know... riding slow in 1st or second gear and the engine wanted to shut down, but doesn't sound like the normal shut down when you don't pull the clutch in time, it's more like getting weak and dying. But it didn't die because I gave it more throttle and it responded with a delay.
photos of my current plug:
a video showing my friend the sound (maybe it can help you hear something).
Do I need to change only the idle TPS for 0.62 volts or also the the full throttle opening volts? What about input voltage?
Can my issue be related to a faulty water pump?
I will do a better video tomorrow, hope it's just a simple solution...
Can this happen if I wash the bike with a too strong water stream?
This video shows something similar to what I'm experiencing but mine is not as bad.
https://www.youtube.com/watch?v=ACgTADVrfi4
Should I just bring the bike to the dealer and have them fix it? (maybe that's not the main issue? don't know).
But when I came back later to pick up the bike (they can't fix the bike until Wednesday), suddenly after starting and trying to ride, 1st gear shuts the bike off when revving just a little bit without clutch release. Even the mechanic tried to ride and the bike would shut down once he revs and tries to release the clutch in gear. Said something it wrong (obviously).
It's like in low rpm the bike wants to die but if I pass that with aggressive throttle, it's kind of back to normal. But I did notice lack of power, in 5th gear the bike felt weak and sounded too screamy in about 60% throttle. Felt like it's 3rd gear, didn't pull hard and the speed wasn't high for normal 5th gear.
Still think it's the TPS sensor?
Can they know if one of the sensors is bad by attaching the bike to the Kawi diagnosis computer program? (that's what they said, that it's all computers and sensors these days and it will tell where the issue is).
Any test of the flow vs OEM ?
You still think my issue is electrical / sensors? Or might just be a bad spark plug / Fuel pump?
Honestly man it could be anything. Starting with your tps is the right move.
Pit Row
https://www.amazon.com/HFP-397-2009-2010-Kawasaki-ER-6N-ER6N-ER650/dp/B…
When do I need to replace this connecting muffler gasket?
In idle, shifting from neutral to 1st with clutch pulled, everything is good, but once revving just a little bit without clutch release - the bike shuts off. Doesn't always happen.
Another weird thing, when going downhill in 2nd, I pulled the clutch all in to see if the bike will shut off and it did. When I released the clutch it started (still going downhill).
Maybe my idle is too low?
With choke it won't die but the overall performance is weak. 5th gear feels like 3rd \ 4th. Revving it didn't give much more power.
Can a honda or KTM dealer diagnose my bike or only a Kawi computer can? I'm sick of waiting and not riding.
Post a reply to: 2018 KX250F shutting down