2021 husqvarna 125

Burger745
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Burger745
Edited Date/Time 9/27/2021 5:14pm
Bike was brought from dealership broken in, setup and tuned on dyno running c-12/927 at 40.1. Bike has 23 hours on it and motor popped at unadilla this past weekend. I have a new top end I wanted to put in before the race but couldn’t do to be bombed at work and figured it would last one more race. Curious how many hours people run on a 125 before changing top ends? My kid is not on the pipe constantly and I was kind of shocked it let go at 23 hours
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pcm_918
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pcm_918 9/21/2021 10:58am
9/21/2021 10:58am
22 hours
4
seth505
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seth505 9/21/2021 11:50am
9/21/2021 11:50am
20ish for mortal rider, 10-15 for mr.nasty.
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Falcon
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Falcon 9/21/2021 3:20pm
9/21/2021 3:20pm
pcm_918 wrote:
22 hours
Woohoo Laughing

A pretty savage rip at the OP's expense, but funny.
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FGR01
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FGR01 9/21/2021 3:42pm
9/21/2021 3:42pm
I have the same bike. I run it hard and went 25 hrs on the first piston. Looked fine when I swapped it.

I'd guess you either sucked dirt or something broke out of the ordinary. I'd be interested to hear what these dyno-tuned settings are.

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CarlinoJoeVideo
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CarlinoJoeVideo 9/21/2021 4:47pm
9/21/2021 4:47pm
FGR01 wrote:
I have the same bike. I run it hard and went 25 hrs on the first piston. Looked fine when I swapped it. I'd guess you...
I have the same bike. I run it hard and went 25 hrs on the first piston. Looked fine when I swapped it.

I'd guess you either sucked dirt or something broke out of the ordinary. I'd be interested to hear what these dyno-tuned settings are.

I've done mysterious pistons at 25 hours. Full engine rebuild at 100. My bike has done a total of 230 hours with these intervals. 2016 KTM 125, now a 150.

What went at 22 hours? Piston and plug photos?
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Burger745
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Burger745 9/21/2021 5:31pm
9/21/2021 5:31pm
I’m crazy at work right now but will tear it down this week. Took the pipe off at track and piston and rings looked fine but I’m wondering if a piece of the skirt broke or possibly wrist pin bearing disintegrated???
Burger745
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Burger745 9/21/2021 5:32pm
9/21/2021 5:32pm
pcm_918 wrote:
22 hours
Dick Lol
Bruce372
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Bruce372 9/21/2021 8:19pm
9/21/2021 8:19pm
Yeah, something has to be amiss, these new bikes go for a lot longer than the older bikes used to.
Bruce372
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Bruce372 9/21/2021 8:20pm
9/21/2021 8:20pm
Plus, they make so much power, they would never achieve that working inefficiently and wearing parts out.
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Burger745
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Burger745 9/24/2021 11:01am
9/24/2021 11:01am
Worse than I thought, main bearing in the bottom end. Plug actually looked to be running rich. Change the air filter after every ride and change tranny oil after every 2 rides. Don’t know what the hell happened
Bruce372
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Bruce372 9/24/2021 3:58pm
9/24/2021 3:58pm
Burger745 wrote:
Worse than I thought, main bearing in the bottom end. Plug actually looked to be running rich. Change the air filter after every ride and change...
Worse than I thought, main bearing in the bottom end. Plug actually looked to be running rich. Change the air filter after every ride and change tranny oil after every 2 rides. Don’t know what the hell happened
See if the dealer will help you out. With less than 30houts they might help you
Burger745
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Burger745 9/25/2021 11:21am
9/25/2021 11:21am
Plastic that

holds main bearing together liquified everything else is still fine
FGR01
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FGR01 9/25/2021 6:51pm
9/25/2021 6:51pm
Now I am even more interested to hear your jetting specs.
seth505
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seth505 9/25/2021 7:22pm
9/25/2021 7:22pm Edited Date/Time 9/25/2021 7:23pm
Ya, ran with no premix or this dyno tuner was far off perhaps.
sandman768
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sandman768 9/27/2021 5:14pm
9/27/2021 5:14pm
I had a 2014 or 15 XC 300 grenade crank bearings for no reason, bike had about 20-30 hrs, ruined crank, cylinder, top end ect. KTM paid for the parts, I paid the dealer labor. I called KTM, the dealer verified the main bearing failure, The KTM rep & I were at an impasse & I Said “ how about you pick up parts bill at the dealer & I pay the labor” …. The rep said “ that sounds good” …. Not sure what your situation is but, if you get a dealer involved you may get some help with the rebuild.

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