Ktm SXF 250 2017 Backfires

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8/5/2017 11:19 AM

Hello guys i need your help please
i Purchased the ktm sxf 250 2017 it has 15 hours and its brand new
when i bought it and give a little of gas and go to high RPM when i stop the gas i hearing some backfires
the bike is not getting stopped or something neither when i pull the gas i dont get any back fires
just when i leave the gas at high rpm im hearing and getting some

im jsut wondering why its happens? i see other bikes like me new and they dont have it

much ty

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8/5/2017 1:47 PM
Edited Date/Time: 8/5/2017 1:48 PM

When you close the throttle, you are creating a very lean condition causing the backfire. The TPS may not be set correctly. The TPS will call for a much leaner condition when the throttle is closed very quickly as apposed to just rolling the throttle back. The TPS controls the fuel mixture in every rpm range and is the leanest at closed throttle.

Paw Paw

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8/6/2017 2:02 AM

Is it effect the bike some how or losing power band some hiw? Or just ignore it? And why the tps is not correct i just got it brand new lol
How can i fix it
Much ty

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8/6/2017 3:47 AM

You gotta get your sag set correctly. That will stop the backfiring.

Much welcome

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8/6/2017 4:16 AM

elikoz wrote:

Is it effect the bike some how or losing power band some hiw? Or just ignore it? And why the tps is not correct i just got it brand new lol
How can i fix it
Much ty

Call your dealer then if it's brand new.

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#1
KX125

8/6/2017 7:27 AM

The dealer may be able to help.
One question first....
Has the exhaust pipe been off the bike? If so, the seal to the head from the pipe will need to be replaced. If it leaks the exhaust will become very lean and also cause this backfiring.
The dealer should be able to check the TPS as well.

Paw Paw

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8/6/2017 7:40 AM

Paw Paw wrote:

The dealer may be able to help.
One question first....
Has the exhaust pipe been off the bike? If so, the seal to the head from the pipe will need to be replaced. If it leaks the exhaust will become very lean and also cause this backfiring.
The dealer should be able to check the TPS as well.

Paw Paw

it is effect the bike somehow? or i can jsut leave it like this?
and much ty for the seriously responds sir

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8/6/2017 7:48 AM

Does it have the stock pipe?

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8/6/2017 8:53 AM

Paw Paw wrote:

The dealer may be able to help.
One question first....
Has the exhaust pipe been off the bike? If so, the seal to the head from the pipe will need to be replaced. If it leaks the exhaust will become very lean and also cause this backfiring.
The dealer should be able to check the TPS as well.

Paw Paw

elikoz wrote:

it is effect the bike somehow? or i can jsut leave it like this?
and much ty for the seriously responds sir

You can leave it. But if you want to get the best performance you can have it adjusted and fixed.

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8/6/2017 10:16 AM

yea bike has a stock pipe

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8/6/2017 10:52 AM

If it's like the 450, just turn up the idle slightly and try that.

The tps setting on the new bikes are slightly different than the old ones.

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8/6/2017 10:59 AM

elikoz wrote:

yea bike has a stock pipe

That's the one Where you gotta stick a potato in the muffler. It stops the back firing instantly.

Much ty

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8/6/2017 4:03 PM

elikoz wrote:

yea bike has a stock pipe

Harry Backmon wrote:

That's the one Where you gotta stick a potato in the muffler. It stops the back firing instantly.

Much ty

He's not going to fall for your old potato in the tailpipe trick!

I-ty okuningi

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8/9/2017 7:38 AM

does anyone haver an idea?

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8/9/2017 11:11 AM

elikoz wrote:

does anyone haver an idea?

Tamir, you should ask this question in the moto section. You'll get a lot more responses.

Much ty

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8/14/2017 8:45 AM

any seriously thoughts?

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