MOD 2013 Kx250f Motor

Bressler11
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Bressler11
Edited Date/Time 3/13/2015 9:30am
Hello Guys I blew up my 2013 kx250f this weekend. I didn't tear into it yet but I am speculating that I cracked the piston. The motor is not seized I just have no compression. Any experience with this mod motor? I'm thinking about a carillo rod and crank, but not sure about the top end...

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mxtech1
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mxtech1 3/9/2015 10:03am
3/9/2015 10:03am
I don't want to sound negative, but if you let a stock motor get to the point where it blew up, you need to learn how to better maintain the motor before you start thinking a mod motor.

A mod motor is more maintenance and you are going to have to rebuild it more frequently due to extra valve train wear and high compression piston wear.
jhansen510
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jhansen510 3/9/2015 10:33am
3/9/2015 10:33am
Dude that sucks! How much time on the bike? Reason I ask is because it looks to have very low hours. I am wondering if it is the stock piston? I have heard that the stock pistons are known to crack on the 13. I have a 13 with a stock piston that it looks like I will be changing before riding it anymore!
swedishfishmx 3/9/2015 6:55pm
3/9/2015 6:55pm
mxtech1 wrote:
I don't want to sound negative, but if you let a stock motor get to the point where it blew up, you need to learn how...
I don't want to sound negative, but if you let a stock motor get to the point where it blew up, you need to learn how to better maintain the motor before you start thinking a mod motor.

A mod motor is more maintenance and you are going to have to rebuild it more frequently due to extra valve train wear and high compression piston wear.
If it's a cracked piston, there really isn't much he could have done to prevent it. I cracked 2 pistons from bad gas. There was nothing I could have done maintenance wise to prevent it.

Luckily it caused no damage and it was an easy fix.
mxtech1
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mxtech1 3/10/2015 10:02am
3/10/2015 10:02am
I'm guessing by the looks of the stator cover this isn't a low hour bike.

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jhansen510
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jhansen510 3/10/2015 7:01pm
3/10/2015 7:01pm
What are you seeing on the stator cover that I'm not? Stock chain and sprockets. Stock seat cover and graphics. All of that seems to be in great shape still. It either hasn't been ridden hard or it hasn't been ridden many hours. I am going to say less than 30. Which to me is a low hour bike considering it's about to be 3 model years old.
Vanilla
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Vanilla 3/11/2015 3:02am
3/11/2015 3:02am
It is a known problem of the '13 that the stock piston will crack. I took it out after 3 hrs because i saw a lot of bikes who had the piston crack after a few hours. If you are lucky you only need a new piston and some gaskets. If you are unlucky you need a whole lot more

If you want to make some upgrades on the engine a Carillo rod should be on of your first steps imo. It is not gonna be a huge difference but the stock rod is also known to break when the engine is made faster. Better safe than sorry right?
Bressler11
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Bressler11 3/11/2015 5:36am
3/11/2015 5:36am
Vanilla wrote:
It is a known problem of the '13 that the stock piston will crack. I took it out after 3 hrs because i saw a lot...
It is a known problem of the '13 that the stock piston will crack. I took it out after 3 hrs because i saw a lot of bikes who had the piston crack after a few hours. If you are lucky you only need a new piston and some gaskets. If you are unlucky you need a whole lot more

If you want to make some upgrades on the engine a Carillo rod should be on of your first steps imo. It is not gonna be a huge difference but the stock rod is also known to break when the engine is made faster. Better safe than sorry right?
Thats what I was thinking along with sending the crank and rod to crank works for a truing and balance...

Any Opinions about the top end?
Bressler11
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Bressler11 3/11/2015 5:38am
3/11/2015 5:38am
mxtech1 wrote:
I don't want to sound negative, but if you let a stock motor get to the point where it blew up, you need to learn how...
I don't want to sound negative, but if you let a stock motor get to the point where it blew up, you need to learn how to better maintain the motor before you start thinking a mod motor.

A mod motor is more maintenance and you are going to have to rebuild it more frequently due to extra valve train wear and high compression piston wear.
I maintain my bikes regularly this bike has relatively low hours as well. Now any opinions on the top end to increase horsepower?
mxtech1
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mxtech1 3/11/2015 9:46am
3/11/2015 9:46am
mxtech1 wrote:
I don't want to sound negative, but if you let a stock motor get to the point where it blew up, you need to learn how...
I don't want to sound negative, but if you let a stock motor get to the point where it blew up, you need to learn how to better maintain the motor before you start thinking a mod motor.

A mod motor is more maintenance and you are going to have to rebuild it more frequently due to extra valve train wear and high compression piston wear.
Bressler11 wrote:
I maintain my bikes regularly this bike has relatively low hours as well. Now any opinions on the top end to increase horsepower?
Be more specific!

What do you want the motor to do? How do you want it to run? What's your budget?
Bressler11
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Bressler11 3/13/2015 9:30am
3/13/2015 9:30am
I want it to run up on top and pull longer into the higher Rpms, My budget is like $2500-$3000 I need decent reliability as well, I plan on running vp t4 race fuel only

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