KTM SXS 300 BIG BORE TOP END KIT-NEED HLEP

mxrider118
Edited Date/Time 12/3/2019 3:27am
Hey guys,

My ktm dealer cannot find any part numbers for top end kit for 300kit 15 sx250.

told me to buy a whole new kit LOL.

Please help.
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mxrider118 6/26/2019 8:55am
6/26/2019 8:55am
CarlinoJoeVideo wrote:
What parts are you looking for? Just use 2015 300 parts finch.
piston, rings, circlips, gaskets etc all top end parts. there is no 300sx only xc. Not sure what to do
YZed250
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YZed250 6/26/2019 8:59am
6/26/2019 8:59am
Just buy a used Cylinder, power valve, head.

Any cylinder from ~2005 to 2015 xc or xcw will work, and then just get the head reworked for how you want the power.
There are a lot of these used cylinders laying around from rich KTM owners that never clear out their old parts stash. Just post a wanted ad on the KTM/Husky Facebook swap share page or ktmtalk forum classifieds. Someone in Vitalmx bazaar forum might also have a kit laying around.

The SXS form KTM includes a nice motocross ECU, which someone might have, but your 250 ECU will work pretty good.

ProCircuit has the best pipe to go with.
mxrider118 6/26/2019 11:53am
6/26/2019 11:53am
I already have the 1300$ 300 kit, just need to rebuild top end. I guess no one has ever rebuilt one.

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Paul_Pitzonka
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Paul_Pitzonka 6/26/2019 12:13pm
6/26/2019 12:13pm
I would just start contacting any of the major piston manufacturing companies and explain to them what you need ... start with vertex, wossner, wiseco, etc... then contact a gasket company like Athena, or cometic and see if they have or can make you a gasket...
Paul_Pitzonka
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Paul_Pitzonka 6/26/2019 12:49pm
6/26/2019 12:49pm
fourfourone wrote:
can he use a piston and ring kit from a 300xc?
Possibly, as long as they share the same bore and wrist pin location, I wouldn’t see why not
CarlinoJoeVideo
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CarlinoJoeVideo 6/26/2019 4:10pm
6/26/2019 4:10pm
CarlinoJoeVideo wrote:
What parts are you looking for? Just use 2015 300 parts finch.
mxrider118 wrote:
piston, rings, circlips, gaskets etc all top end parts. there is no 300sx only xc. Not sure what to do
There shouldn't be any difference. I'd buy everything for an XC and compare when you take your engine apart.

It's not like they make a 300SX like you said, so they are all XC parts.

I think the only difference with the bikes is the gear ratio and CDI.

Jeff @ Slavens would know
https://slavensracing.com/
BobPA
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BobPA 6/27/2019 9:23am
6/27/2019 9:23am
CarlinoJoeVideo wrote:
What parts are you looking for? Just use 2015 300 parts finch.
mxrider118 wrote:
piston, rings, circlips, gaskets etc all top end parts. there is no 300sx only xc. Not sure what to do
CarlinoJoeVideo wrote:
There shouldn't be any difference. I'd buy everything for an XC and compare when you take your engine apart. It's not like they make a 300SX...
There shouldn't be any difference. I'd buy everything for an XC and compare when you take your engine apart.

It's not like they make a 300SX like you said, so they are all XC parts.

I think the only difference with the bikes is the gear ratio and CDI.

Jeff @ Slavens would know
https://slavensracing.com/
I believe the SX version has the compression bumped up as well.
metal_miracle 6/30/2019 1:54am
6/30/2019 1:54am
Think this is the kit i got from ktm for my sx300

00050000001 - piston kit gr.II300sx/exc 07-
1
yzrider53
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yzrider53 6/30/2019 8:31am
6/30/2019 8:31am
I had a 14 250/300, same motor. You use the 300 xc top end kit/piston.

As mentioned above, the only difference is the head and ecu.
MXGrip
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MXGrip 12/1/2019 10:03pm
12/1/2019 10:03pm
Hey guys I’m looking at a 2012 250sx that he says has the 300 big bore installed but has no documentation. How can I tell that it has been done? Markings on the jug/head? Sorry to but-in this thread but I can’t find the info anywhere! Thanks!
YZed250
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YZed250 12/2/2019 9:20am
12/2/2019 9:20am
There should be a 72 stamped on the left side base of the cylinder.
T-Fish
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T-Fish 12/3/2019 3:25am
12/3/2019 3:25am Edited Date/Time 12/3/2019 3:27am
MXGrip wrote:
Hey guys I’m looking at a 2012 250sx that he says has the 300 big bore installed but has no documentation. How can I tell that...
Hey guys I’m looking at a 2012 250sx that he says has the 300 big bore installed but has no documentation. How can I tell that it has been done? Markings on the jug/head? Sorry to but-in this thread but I can’t find the info anywhere! Thanks!
Photo of each side of my 300SXS equipped engine.


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