13 kx250f starting/idle issues? Valves?

Dylanyuen271
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North Tonawanda, NY US
8/17/2018 9:27am Edited Date/Time 8/17/2018 9:39am
2013 kx250f. I have 95 hours on my bike on original motor and valves have never been clearenced. I don't know how they made it this long. My bike is just now starting to show signs that they need adjustment(I think). My bike will start in a few kicks at the beginning of the day but it won't idle for very long. Almost sounds like it wants to cut out every 5 seconds until it dies. Once I get it warmed up it will idle. But then it will get very difficult to start. I found that for some reason it will start when I give it gas as I kick. I don't understand though because it is fuel injected. Why is this? I also noticed once in a while when I kick the starter I feel like snap or something. Yes I have been pushing the starter to compression and then kicking. Could all this point to my valves or what's up with it? My bike seems fine when I ride though.
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Paw Paw 271
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Benton, LA US
8/17/2018 9:55am
Check valve clearances.
Check and or replace cam chain.
Check fuel pump and filter.
Clean fuel injector.

Paw Paw
1
kb228
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Mansfield, OH US
8/17/2018 10:02am
Check valve clearances.
Check and or replace cam chain.
Check fuel pump and filter.
Clean fuel injector.

Paw Paw
X2.
Dylanyuen271
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North Tonawanda, NY US
8/17/2018 10:04am
Check valve clearances.
Check and or replace cam chain.
Check fuel pump and filter.
Clean fuel injector.

Paw Paw
Any idea why it starts when I give it gas when I kick. I don't understand. Its F.I
Paw Paw 271
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8/17/2018 12:14pm Edited Date/Time 8/17/2018 1:27pm
Either idle set too low, TPS is not set correctly or fuel injector is dirty.
You do understand it's past time for a new top end and timing chain as well, correct?

Paw Paw

The Shop

Dylanyuen271
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North Tonawanda, NY US
8/17/2018 1:29pm
Lmaoo false alarm. Idle was way too low ?. Turned her back up to 2000 rpm. Thanks for all the suggestions guys.
Dylanyuen271
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North Tonawanda, NY US
8/17/2018 1:34pm
Either idle set too low, TPS is not set correctly or fuel injector is dirty. You do understand it's past time for a new top end...
Either idle set too low, TPS is not set correctly or fuel injector is dirty.
You do understand it's past time for a new top end and timing chain as well, correct?

Paw Paw
Oh yeah I'm aware. However it does vary quite a bit from bike to bike and how its been ridden and maintained. In my case, it's been very well maintained all it's life and about half it's life very lightly ridden. Mechanic checked out the top end for me at about 60 hours and said I had another season in her. She's probably nearing the end lol. Still has good compression amd power though.
fourfourone
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86oh, CT US
8/17/2018 1:53pm
I wouldn't ignore it. unless you lowered the idle theres no reason it would just lower on its own. You might be compensating for an issue by raising the idle up. You would be crazy not to do a top end in that bike asap. What could cost you a couple hundred now may cost a couple thousand if you completely blow it up.
1
Paw Paw 271
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8/17/2018 1:55pm
I wouldn't ignore it. unless you lowered the idle theres no reason it would just lower on its own. You might be compensating for an issue...
I wouldn't ignore it. unless you lowered the idle theres no reason it would just lower on its own. You might be compensating for an issue by raising the idle up. You would be crazy not to do a top end in that bike asap. What could cost you a couple hundred now may cost a couple thousand if you completely blow it up.
X2

Paw Paw
kb228
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8/17/2018 2:13pm
Id prob still consider doing a valve job at 95 hours. Im not sold they havent moved
1
Dylanyuen271
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North Tonawanda, NY US
8/17/2018 2:13pm
I wouldn't ignore it. unless you lowered the idle theres no reason it would just lower on its own. You might be compensating for an issue...
I wouldn't ignore it. unless you lowered the idle theres no reason it would just lower on its own. You might be compensating for an issue by raising the idle up. You would be crazy not to do a top end in that bike asap. What could cost you a couple hundred now may cost a couple thousand if you completely blow it up.
Pretty sure I twisted it a few times here and there over time when pulling the idle valve out. Bike shows no signs of top end wear. However I am getting it checked out soon
Dylanyuen271
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8/17/2018 2:14pm
kb228 wrote:
Id prob still consider doing a valve job at 95 hours. Im not sold they havent moved
I agree lol. Gonna take it to my mechanic soon

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