2017 ktm 350sxf ---puff of smoke

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10/5/2017 8:49 PM

So I started the bike cold and let it idle for 2 min and I heard the motor start to sound like it was struggling,,, I reved it a bit and it blew a huge plume of white smoke then it all cleared up real quick..... WTF was that? So I just rode it easy for a few laps and no issue.

Any body experience this ???

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10/5/2017 9:40 PM

White smoke usually is from a coolant leak.

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10/5/2017 9:43 PM

My initial thought is that you may have sucked some air filter oil, but I've never actually seen or tested that theory. It could explain it all, but again, just a theory.

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10/6/2017 5:41 AM

Like mentioned above if you just put a clean air filter in that's probably the culprit , or you have a leaky valve seal which isn't a big deal as long as you're not leaving a trail of smoke behind the bike when you're riding I wouldn't worry about it.

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10/6/2017 6:44 AM

RCF wrote:

Like mentioned above if you just put a clean air filter in that's probably the culprit , or you have a leaky valve seal which isn't a big deal as long as you're not leaving a trail of smoke behind the bike when you're riding I wouldn't worry about it.

I had a valve seal start to go at about 80 hours on my 16 250f and it would smoke almost like a 2 stroke. Ran fine other than that but as stated above it was a constant smoke not just 1 puff.

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10/6/2017 8:12 AM
Edited Date/Time: 10/6/2017 8:12 AM

I've also had this happen from going too ham with the filter oil... usually a direct result of the amount of beers consumed prior to oiling my filter.

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10/6/2017 9:25 AM

My 450 has done this a couple of times too. It acts like it loads up like a two stroke a bit, clean it out and it is good to go.....Only happens when I use the "choke"

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Tomac and/or Anderson for 2020.....

10/6/2017 9:30 AM

That's it... I just put in a new filter the night before.... and had a few beers

Thanks for the help

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10/6/2017 2:29 PM

White smoke can also be raw fuel. It’s what diesels do when an injector starts to have an issue and dumps a lot of fuel and the engine can’t even begin to burn it and the injector usually hangs open injecting on the other 3 strokes. Black smoke is the result of being overfueled but the engine can consume it. White is still in its raw vapor form and usually results in a hydro lock. Could’ve been a hiccup with the ignition or injector.

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10/6/2017 2:31 PM

Matt Barber wrote:

That's it... I just put in a new filter the night before.... and had a few beers

Thanks for the help

I wasn't trying to be a smartass. It could be a bunch of things. Was just relaying my personal experience.

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10/6/2017 6:29 PM

I should add that mine only did this on colder mornings where I had to crank the bike over slow a few times to warm the battery up.

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Tomac and/or Anderson for 2020.....

10/7/2017 12:19 PM

BobPA wrote:

I should add that mine only did this on colder mornings where I had to crank the bike over slow a few times to warm the battery up.

Shoulda poured more beer on it bob w00t

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