2013 Ktm 125 to 150

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CrGuy2T

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10/1/2015 3:38 PM

Can I just change the cylinder or do I need the 150 crank as well?

respect_the_beast

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10/1/2015 3:47 PM

I believe the bore AND stroke are different.

cruiser450

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10/5/2015 7:57 PM

I just did a 15 husky tc125 to a 150sx. Cylinder,head and powervalve and piston kit made it work.i have a used 15 ktm150 cyl for sale it has 45hrs on it.

@jbr148 insta ✌

CrGuy2T

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10/6/2015 10:20 AM

I did some checking and the 125 bore and stroke is 54 mm x 54.5 mm vs the 150 is 56 mm x 58.4 mm. So I'm probably just gonna hold out until this thing needs a crank and just do the 200 crank and cylinder. It cost the same amount of money. I think a 200sx would be the ultimate 2 stroke.

cruiser450

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10/6/2015 10:45 AM

I stand corrected we did put a new crank in it as well and its the 150 crank.

@jbr148 insta ✌

JZ125

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10/6/2015 12:54 PM

In the new MXA they give a breakdown of shared parts between the SX125 and SX150 and I really thought it was a very short list of differences......................

respect_the_beast

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10/6/2015 5:36 PM

JZ125 wrote:

In the new MXA they give a breakdown of shared parts between the SX125 and SX150 and I really thought it was a very short list of differences......................

You're right, when 2016 models are concerned. The pre-2016 models do not share the same stroke, both it and the bore differ.

CrGuy2T

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10/6/2015 6:10 PM
Edited Date/Time: 10/6/2015 6:11 PM

JZ125 wrote:

In the new MXA they give a breakdown of shared parts between the SX125 and SX150 and I really thought it was a very short list of differences......................

respect_the_beast wrote:

You're right, when 2016 models are concerned. The pre-2016 models do not share the same stroke, both it and the bore differ.

Yeah I been doing some reading on all of them. This is why I have decided when the time come to just do the 200 swap. I honestly don't have much tied up in the bike at all so I don't mind putting some money in it to make it even sweeter.

respect_the_beast

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10/6/2015 6:50 PM

CrGuy2T wrote:

Yeah I been doing some reading on all of them. This is why I have decided when the time come to just do the 200 swap. I honestly don't have much tied up in the bike at all so I don't mind putting some money in it to make it even sweeter.

Are you going to use the XC-W cylinder and ignition? I know those 200SX parts are tough to find.

CrGuy2T

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10/6/2015 6:53 PM

I think you can still get the 200sx cylinder from Ktm. If not I can go with the xc-w and just get it ported. Either way xc-w will still have more power than a 150. Still should be a really good motor.

respect_the_beast

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10/6/2015 7:07 PM

I don't doubt it!

MxKing809

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10/7/2015 9:25 AM

CrGuy2T wrote:

I think you can still get the 200sx cylinder from Ktm. If not I can go with the xc-w and just get it ported. Either way xc-w will still have more power than a 150. Still should be a really good motor.

I had a 200XC and it was a dog. There was a reason that it was a woods bike, and it had no business on the MX track. It had ZERO top end..... but with your MX crank and flywheel/porting maybe it'll be better

Washed up moto and enduro weekend warrior.

Current bikes: 2016 YZ450F, 2003 CR250r, 2002 CR125r, 2008 TTR125b

JMX82

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10/7/2015 9:57 AM

I think SX model different exhaust valve spring makes a big difference too in engine character