2018 KTM 250sx

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1/31/2018 7:27 PM

Just bought a brand new 250sx. get it home and i hear this knocking while at idle like detonation, pinging, what have you. i take it to the dealer and they said yes it was detonation put richer jets in it. i do that and it is still doing it but not as bad. running motorex at 60:1 and vp 110. any advice guys. thanks so much

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1/31/2018 8:42 PM
Edited Date/Time: 1/31/2018 8:46 PM

Photo


Photo

Always has the brand name in the title. New sign up.

Paid forum poster.

Advice? Take your bullshit elsewhere. Thanks so much.
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much ty. How to spot a paid forum poster/artificial forum traffic producer (see list of actions/phrases below):

Copius pattern amounts of phrases like “Anyone have”..., “Anybody know?”.... and their variations.

Thoughts?
Any help is appreciated!
Thanks in advance!





1/31/2018 8:47 PM

kzizok wrote: Photo


Photo

Always has the brand name in the title. New sign up.

Paid forum poster.

Advice? Take your bullshit elsewhere. Thanks so much.

i’m not getting paid to post jack shit, who the hell does that anyways. sorry i put the brand in the title i didn’t know. won’t happen again!

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2/1/2018 5:52 AM

Do some research here and over on KTM talk, jetting issues on this machine are well documented. The shortest and easiest way to happiness will be, get cylinder head cut to close up the squish, JD jet kit, V Force reeds.

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2/1/2018 6:18 AM

I had a JD jet kit in my 13 250sx and it was night and day difference. Never fooled with jetting after that.

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2/1/2018 6:35 AM

Thread that has in-depth jetting on your bike.

https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/17-TC250-Jetting-Help,1329212

Why are you running C110? It's unleaded, switch over to C12 as its leaded and will help some performance wise as well.

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2018 KTM 250sx
Instagram CamaroAJ

2/1/2018 6:45 AM

AJ565 wrote:

Thread that has in-depth jetting on your bike.

https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/17-TC250-Jetting-Help,1329212

Why are you running C110? It's unleaded, switch over to C12 as its leaded and will help some performance wise as well.

that’s what the dealer told me to run. here is the plug the bike runs fine except for that damn knocking noise. Photo

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2/1/2018 7:36 AM

My 17 TC250 makes the same noise. Only at idle. From my research I found that it is just a low rpm gear slap from the counterbalancer. If you take off the L side engine cover you can wiggle the counterbalancer back and forth and it makes a small clunking noise. I believe that is where the noise is coming from.

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2/1/2018 7:44 AM

I'm going riding Saturday so I'll listen to see if mine does it. I want to say no it doesn't though.

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2018 KTM 250sx
Instagram CamaroAJ

2/1/2018 7:54 PM

paddyB745 wrote:

My 17 TC250 makes the same noise. Only at idle. From my research I found that it is just a low rpm gear slap from the counterbalancer. If you take off the L side engine cover you can wiggle the counterbalancer back and forth and it makes a small clunking noise. I believe that is where the noise is coming from.

yeah like if you let off the gas as it is simmering down you’ll hear a “knock knock”

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2/2/2018 6:11 AM

I was wrong about the VP110, I was thinking of C10 as that one is unleaded. The dealer I normally get fuel from is out of C12 so I'm going to get some VP110 and run it this weekend. It's really close to C12 so I'll report back if I notice any performance difference or noises.

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2018 KTM 250sx
Instagram CamaroAJ

2/4/2018 4:51 PM

So I lied, I bought U4.4 instead of VP110. I did let the idle get real low and I also get a knock noise from the balance shaft.

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2018 KTM 250sx
Instagram CamaroAJ

2/5/2018 7:14 AM

my buddy's '18 250sx knocks as well. he is running JD kit. trying to figure out what it is.
my '18 300xc does not knock

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2/5/2018 11:24 AM

mine made the same noise. I had a 16 250sx with the jd kit. Does it get quieter when you pull the clutch in

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2/5/2018 1:47 PM

I only noticed it at almost going to stall low idle speed. I have my bike tuned to stall after 2-3 seconds of zero throttle though.

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2018 KTM 250sx
Instagram CamaroAJ