Window’d KTM engine.

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9/24/2017 3:58 PM
Edited Date/Time: 9/25/2017 9:26 AM

We’ve almost all seen the video of the KXF 450 out in the hills, revved up and ready to practice a start, and then “BOOM”.

Same thing happened this morning to my buddy. On the line for his first moto of the day, set the launch control, hit the gas and as soon as it hit the limiter...clank.

Does anyone have any ideas as to why this happened? Relatively low hours for a 450 and still under the recommended hours for any engine work.

This is a 2017.5 KTM 450SX-F FE.

Photo

Photo

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9/24/2017 4:05 PM

Happened to my buddies 250sxf at 10 hours. Ktm took care of it

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9/24/2017 4:05 PM

Looks like rod snapped. However you gotta take the top end off and see if it was something else. That is one expensive repair.

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sponsored by zip tie, JB weld and peanut butter and jelly

9/24/2017 4:40 PM

ouchy sad

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Current rides: 2020 CRF450RWE and 2019 TC300
Occasional ride for VMX: 1985 CR500RF
Adventure/Road bike: CRF1000L

9/24/2017 4:55 PM

Peely's answer will be posted shortly.

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I ripped a start from Egypt and I was happy about that.

9/24/2017 4:58 PM

Sweet mother of god that is going to be expensive, I have never seen this!

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9/24/2017 5:01 PM

Katoom

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9/24/2017 5:11 PM

Forty wrote:

Katoom

Kaboom

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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!





9/24/2017 5:13 PM

Wow ... That sucks! I'm sure your dealer will go to bat for you with KTM.

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9/24/2017 5:20 PM

Seized rod at the crank?

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9/24/2017 5:21 PM

Looks like you're half way to having a V Twin now. Sorry about the bad luck. Hopefully KTM will help out a little.

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9/24/2017 5:33 PM

Damn, over two grand for crank, cases and piston. That's not counting all the bearings you probably wouldn't reuse in the cases, gaskets, timing chain, maybe some head work, maybe an oil pump...and heaven forbid he has to pay someone the labor. Hopefully KTM helps out, or hopefully the shop cuts some serious discounts. Could be four grand with no help and just dropping the bike off at a shop.

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9/24/2017 5:43 PM

yuck. at least it wasn't up a jump face.

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If I'm healthy enough to complain. I shouldn't be complaining.

9/24/2017 5:54 PM

I am glad I don’t ride anymore. I couldn’t afford this kind of thing! Sheesh.

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9/24/2017 6:06 PM

Ktm will fix that. Call a dealer near you.

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9/24/2017 6:19 PM

Cutting that much weight in the engine comes with a price.

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9/24/2017 6:31 PM

There doesn't appear to be much oil on anything in that photo. I'm probably wrong though....

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9/24/2017 6:34 PM

chad_111 wrote:

Cutting that much weight in the engine comes with a price.

Facepalm

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

9/24/2017 6:43 PM

wreckitrandy wrote:

There doesn't appear to be much oil on anything in that photo. I'm probably wrong though....

That’s because the oil is on the starting line a couple hundred yards away, lol. I took this photo after he pushed it back to his vehicle and had it loaded up.

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9/24/2017 6:47 PM

chad_111 wrote:

Cutting that much weight in the engine comes with a price.

Does it, DOES IT CHAD?

laughing

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9/25/2017 2:08 AM

chad_111 wrote:

Cutting that much weight in the engine comes with a price.

KTM has been cutting connecting rod weight for years without cutting piston weight. This is a travesty and must be stopped. I suggest bringing down displacement to lower piston weights. #wewant2strokes

But seriously, could be a bad connecting rod. Could be your buddy downshifted too much the last time he rode, revving the engine way over the red line and damaged the rod then. Just happened to let go today.

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9/25/2017 2:11 AM

If by no engine work you mean never replaced the piston, thats why. Pistons are 10 hour parts. By 43 hours a top end is too tired to be revved to the moon.

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

9/25/2017 2:18 AM

Acidreamer wrote:

If by no engine work you mean never replaced the piston, thats why. Pistons are 10 hour parts. By 43 hours a top end is too tired to be revved to the moon.

10 hour parts?! How did you come by that information?

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9/25/2017 2:19 AM

Acidreamer wrote:

If by no engine work you mean never replaced the piston, thats why. Pistons are 10 hour parts. By 43 hours a top end is too tired to be revved to the moon.

Doesn't look like the piston let go.. what's s crank rebuild then?

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9/25/2017 2:45 AM

Acidreamer wrote:

If by no engine work you mean never replaced the piston, thats why. Pistons are 10 hour parts. By 43 hours a top end is too tired to be revved to the moon.

Bullshit. Very much bullshit.

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9/25/2017 3:08 AM

Lol 10 hour pistons...

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9/25/2017 3:09 AM

Acidreamer wrote:

If by no engine work you mean never replaced the piston, thats why. Pistons are 10 hour parts. By 43 hours a top end is too tired to be revved to the moon.

You gotta change 450 pistons at 10 hours?!

So I have to change my 250 at 5?

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If you're not mixing gas, you're not haulin ass.

9/25/2017 3:12 AM

Call it bullshit if you want. My kx manual says it right there pistons need replaced at 15 hours. Check the crank at 15 hours. Im pretty sure the engineers who designed the bikes know a lot more than you do. Do you see any pro teams running a race bike for 40 hours? No. You dont. Keep your bike fresh and you dont have to worry about it blowing up. If this guys ktm was running at the rev limiter for 43 hours his crank could have very well been out of spec. No clue till its torn down.

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

9/25/2017 3:29 AM

I do agree in the sense that 43 hours is a little too many to expect any warranty work. I've actually never expected any warranty work for a dirt bike ever due to its inherent nature, but thankfully I never had anything major happen so soon. But hey, it's a race bike and shit happens.
But in the real world who changes pistons at 10-15 hours on a 450? Sure the manual says so, blah, blah, blah. I think 40-50 is probably the minimum I would change it at, I got 80 out of mine with no issues.

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9/25/2017 3:34 AM

I've 63 hours on my 10 hour piston. I'll switch it out this winter but only as a maintenance item. It runs strong.

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