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Discussion Starter #1
I hope someone can answer my question or help with my problem. i recently bought a 2006 ktm 125sx for a great price, but the cylinder and head are gone. new they are about 700.00. i have found one for a 2002 model, will it work? if not any ideas without buying new?

thanks Martin
 

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Welcome to the forum Martin.

Sorry you can't use a 2006 jug on your bike.

Any of these will fit:

2002 125 SX CYLINDER 125/200 2002 (Item Number 5)
2002 125 SXS CYLINDER 125/200 2002 (Item Number 5)
2003 125 SX CYLINDER 125/200 (Item Number 5)
2003 125 SXS CYLINDER 125/200 (Item Number 5)
2004 125 EXC (SIX DAYS) CYLINDER 125/200 (Item Number 5)
2004 125 SX CYLINDER 125/200 (Item Number 5)
2004 125 SXS CYLINDER 125/200 (Item Number 5)
2005 125 EXC (SIX DAYS) CYLINDER 125/200 (Item Number 5)
2005 125 SX CYLINDER 125/200 (Item Number 5)
2005 125 SX TYLA RATTRAY CYLINDER 125/200 (Item Number 5)
2005 125 SXS CYLINDER 125/200 (Item Number 5)
 

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Discussion Starter #4
2006 ktm 125sx

my bike is a 2006
the cyinder i have found is off of a 2002.
need to know if it will work on my 2006.
thanks martin
 

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my bike is a 2006
the cyinder i have found is off of a 2002.
need to know if it will work on my 2006.
thanks martin
No it won't.

As I posted before the 2002 jug is compatible with ONLY these bikes:

2002 125 SX CYLINDER 125/200 2002 (Item Number 5)
2002 125 SXS CYLINDER 125/200 2002 (Item Number 5)
2003 125 SX CYLINDER 125/200 (Item Number 5)
2003 125 SXS CYLINDER 125/200 (Item Number 5)
2004 125 EXC (SIX DAYS) CYLINDER 125/200 (Item Number 5)
2004 125 SX CYLINDER 125/200 (Item Number 5)
2004 125 SXS CYLINDER 125/200 (Item Number 5)
2005 125 EXC (SIX DAYS) CYLINDER 125/200 (Item Number 5)
2005 125 SX CYLINDER 125/200 (Item Number 5)
2005 125 SX TYLA RATTRAY CYLINDER 125/200 (Item Number 5)
2005 125 SXS CYLINDER 125/200 (Item Number 5)
 

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No worries! DON'T be SORRY.

We are equally seeking knowledge...well maybe except for The Wolf.....:sweatdrop:
 

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I've got a 04 ktm 125sx what year of a 200sx or 250sx cylinder and head will fit on on it if any at all. I'm doing this for a friend pretty much rebuilding the whole motor and I was just curious if we can make it bigger. I will be porting and polishing it with a few other mods and I would like to know what Reeds is best for this bike because it looks like you cannot get V Force 3 or V Force 4 Reeds for this bike but you can for the 200 and the 250 so thank you for any knowledge and help
 

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If you want to put a bigger piston on a KTM125 the only one I know of that will fit is a KTM150 barrel and piston, but I don't think KTM made a 150cc bike with that early motor?
 

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Framed!

I have a 06 and was wanting to change the tank to black. will a 07 tank fit?
The frame changed from 2006 to 2007 so to fit a 2007 tank on a 2006 will not be a straight forward job. I have not done this, but as the tanks are moulded to fit on their respective frames I think the answer to your question is sadly NO.

But the black tanks are a pain anyhow and I prefer the white ones as we can easily see how much fuel there is left.
 

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Size does matter!

So they wont interchange with any cylcinder
Earlier KTM also had a 144cc cylinder that could be an option. But I have never worked with one so I do not know what you need to do, apart from change piston. And not sure they are available anymore.

Regarding trying to fit 250cc bits on a 125 motor, that will not work. They have a different stroke just as one issue.

But the 200 cylinder will fit! Part # 52330038300. I do not know what other things apart from cylinder, piston and cylinder head needs to be changed.
 

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I have a 1999 125sx what cylinders from other yrs can i put on it
I look in to it and come back to you. Give me a day or two and I should have some answers.
 

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I look in to it and come back to you. Give me a day or two and I should have some answers.
Your engine number should be 9 - 503XX.... So any 125 cylinder that starts with the part# 503 will work:
Cylinder 125 2002 50330005300 $534.08 (still available from from ktmworld.com). This one was used up to and including 2005
 
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