2017 125sx bike problems

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4/28/2018 11:54 PM
Edited Date/Time: 4/29/2018 12:01 AM

Hi, I've recently bought a brand new 2017 125sx straight off the showroom floor, I broke in the bike for 2 hours how my mechanic recommended, The bike was running amazing no problems, air filter after every ride, drained the gear oil after I broke it in, today I've got it out to the track started and warmed it up as usual, I rode it for 3 motos and on my 4th as I was riding and it stalled, I didn't worry too much about it, riding normal again, not even 30 secs later it did the same thing locking up, the kick start wouldn't go down. Obviously the motor was ceased and when it cooled down I was able to to press down on the kick start. it started and ran. But like shit, the sound was off and heaps of vibration. I turned the bike off and was nearly sure it was the bottom end. But what I wasn't sure on was how? THE BIKE HAS 9 hours on it new, no rebuilds, no major work. The bike has been looked after I have have gone through with everything the manual has said to do after each ride. Overall I was just wondering if anyone had a similar problem, or know what is happening, the bike has warranty and I'll be taking it back to the dealership. Not sure if they're gonna do anything. Help would be appreciated from anyone.
Thanks

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4/29/2018 1:24 AM

That sucks. But like always with KTM, they will fix it for you no questions asked.

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4/29/2018 7:31 AM

Got to ask the stupid question. Did you mix your pre-mix correctly?

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4/29/2018 9:40 AM
Edited Date/Time: 4/29/2018 9:41 AM

Some of the new two strokes require 60:1, right?

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4/29/2018 2:15 PM

60:1 in a pinger bad idea. Ktm needs new stock settings with the mikuni to run 32:1. Or just go back to the Keihin

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4/29/2018 2:23 PM

60:1 is that seriously what they recommend?...

Sounds like a straight forward seize, lack of oil or running too lean

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4/29/2018 2:28 PM

125 and 150’s are 40:1, they will seize at 60:1.

250 and 300’s are 60:1

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4/29/2018 2:30 PM

Air leak I’m guessing

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4/29/2018 4:40 PM

I'll ask another stupid question: Was the radiator full of coolant?

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4/29/2018 5:20 PM

I run my 250 at 60:1 and it runs fine, believe me i thought the dealer was nuts when they said that

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4/29/2018 5:28 PM

Fake news! 2 strokes never break down.

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4/29/2018 11:17 PM

langhammx wrote:

125 and 150’s are 40:1, they will seize at 60:1.

250 and 300’s are 60:1

We run it at 50:1 what the manual says

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4/29/2018 11:19 PM

nytsmaC wrote:

Air leak I’m guessing

What would you get a air leak from?

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4/29/2018 11:20 PM

crf250pilot wrote:

Got to ask the stupid question. Did you mix your pre-mix correctly?

50:1

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4/29/2018 11:26 PM

UPSman334 wrote:

I run my 250 at 60:1 and it runs fine, believe me i thought the dealer was nuts when they said that

250s and 125s have different ratios I'm pretty sure

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4/30/2018 2:12 AM

250/300 is 60:1 and 125/150 is 40:1 in the manual, but 1:60 is fine for 125. I went riding with guys who work at the KTM factory a few years ago and they use 1:60 for every twostroke. One of them told me they tested ratios of up to 1:100 on dyno runs without any problems.
Is it necessary to use 1:32 in race gas engines or do you guys run that in stock engines too?

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4/30/2018 5:24 AM

40:1 with pump 93 for 40 hours with no issues on my 150.

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I'm not an actual kid
Red Bud Vet Fest 2020: https://www.youtube.com/watch?v=3gpxS0KgQFc

District 14
2017 KTM 150

R.I.P. Steel City

4/30/2018 9:01 AM

nytsmaC wrote:

Air leak I’m guessing

oneightyone wrote:

What would you get a air leak from?

Airboot to carb, carb to intake boot/reed cage, base gasket not seated properly, air filter not seated properly, etc. .

Did you check the torque specs on the head or cylinder after first ride?

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4/30/2018 12:14 PM

langhammx wrote:

125 and 150’s are 40:1, they will seize at 60:1.

250 and 300’s are 60:1

oneightyone wrote:

We run it at 50:1 what the manual says

+1. My 125 did 80 hours at 50:1(pistons every 20 hours).

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4/30/2018 3:23 PM

nytsmaC wrote:

Air leak I’m guessing

oneightyone wrote:

What would you get a air leak from?

miketherider wrote:

Airboot to carb, carb to intake boot/reed cage, base gasket not seated properly, air filter not seated properly, etc. .

Did you check the torque specs on the head or cylinder after first ride?

After the first we checked the head and tightened most things to spec, on the motor

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4/30/2018 3:24 PM

langhammx wrote:

125 and 150’s are 40:1, they will seize at 60:1.

250 and 300’s are 60:1

oneightyone wrote:

We run it at 50:1 what the manual says

CarlinoJoeVideo wrote:

+1. My 125 did 80 hours at 50:1(pistons every 20 hours).

That’s why I’m thinking it’s not the fuel ratio

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4/30/2018 3:24 PM

#434 wrote:

250/300 is 60:1 and 125/150 is 40:1 in the manual, but 1:60 is fine for 125. I went riding with guys who work at the KTM factory a few years ago and they use 1:60 for every twostroke. One of them told me they tested ratios of up to 1:100 on dyno runs without any problems.
Is it necessary to use 1:32 in race gas engines or do you guys run that in stock engines too?

Is this for 2017 bikes?

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4/30/2018 3:41 PM

From the 2017 manual:
Photo

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4/30/2018 3:42 PM

I've seen the ol' ratio debate a hundred times and there is no universal answer because it's relative. The oil is for protection and what dictates the minimum necessary amount is the rider. Rev a smoker like a teen Barcia on amphetamines in the desert and 60:1 is never going to cut it, but it might be fine for a chill rider on singletrack. It's why you generally see the manuals increase oil as the displacement decreases, because rpm's go up when displacement goes down and when rpm's go up, you need more oil for protection.

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4/30/2018 3:52 PM

oneightyone wrote:

We run it at 50:1 what the manual says

CarlinoJoeVideo wrote:

+1. My 125 did 80 hours at 50:1(pistons every 20 hours).

oneightyone wrote:

That’s why I’m thinking it’s not the fuel ratio

Your ratio is fine, 50:1 is actually richer than 40:1 or 32:1.

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4/30/2018 4:58 PM

^ How do you figure?

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4/30/2018 5:11 PM
Edited Date/Time: 4/30/2018 8:26 PM

The same word is used to describe two conditions and he's omitting the information needed for it to make sense. Less oil in the gas (lean) means more of the actual gas that mixes with air (rich). There's oil/gas rich and there's fuel/air rich and there's a connection between them. It's very slight though, because 4oz of oil per gallon is 32:1 and 2.6oz per gallon is 50:1, so you're literally talking about 1.4oz of gas displaced by the oil, or about 1% when referencing fuel/air. In other words, it's meaningless.

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4/30/2018 8:14 PM

byke wrote:

The same word is used to describe two conditions and he's omitting the information needed for it to make sense. Less oil in the gas (lean) means more of the actual gas that mixes with air (rich). There's oil/gas rich and there's fuel/air rich and there's a connection between them. It's very slight though, because 4oz of oil per gallon is 32:1 and 2.6oz per gallon is 50:1, so you're literally talking about 1.4oz of gas displaced by the oil, or about 1% when referencing fuel/air. In other words, it's meaningless.

So running a slightly different fuel ratio wouldn’t be the case?

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4/30/2018 8:21 PM

byke wrote:

I've seen the ol' ratio debate a hundred times and there is no universal answer because it's relative. The oil is for protection and what dictates the minimum necessary amount is the rider. Rev a smoker like a teen Barcia on amphetamines in the desert and 60:1 is never going to cut it, but it might be fine for a chill rider on singletrack. It's why you generally see the manuals increase oil as the displacement decreases, because rpm's go up when displacement goes down and when rpm's go up, you need more oil for protection.

So would running 50:1 do you the bottom end, we still have no idea the cause of the problem yet

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4/30/2018 8:24 PM

hellbillyohio wrote:

^ How do you figure?

50 to 1 has way more fuel then 32 to 1. Thus it's richer

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