What type of piston should I buy?

logan_140
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logan_140
Edited Date/Time 7/14/2015 6:27pm
2015 ktm 250sx. I used to buy pro x on my 125 but I'm thinking about just going oem also what is the compression usually? I just want to freshen the bike up. Only 30 hrs on it
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DTHA70
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DTHA70 7/13/2015 2:48pm
7/13/2015 2:48pm
vertex.and if its under 150psi then its time for a top end
nage0139
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nage0139 7/13/2015 8:17pm
7/13/2015 8:17pm
I'd go with Vertex as well for the KTM's. 30 hours is a quite a bit for a top end... I would replace it either way.
logan_140
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logan_140 7/13/2015 8:20pm
7/13/2015 8:20pm
nage0139 wrote:
I'd go with Vertex as well for the KTM's. 30 hours is a quite a bit for a top end... I would replace it either way.
Yeah it's time for one I think. I mean it hasn't lost any power but rather be safe than having it blow up.
nage0139
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nage0139 7/13/2015 8:23pm
7/13/2015 8:23pm
Exactly. Bikes always seem to run better than ever right before they destroy themselves.

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logan_140
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logan_140 7/13/2015 8:26pm
7/13/2015 8:26pm
nage0139 wrote:
Exactly. Bikes always seem to run better than ever right before they destroy themselves.
Gonna order me the c clipper tool and put a piston in next week. (The c clipper tool is a tool that pops the circlips in for you)
Fearo
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Fearo 7/14/2015 5:18am
7/14/2015 5:18am
Yes, Vertex is stock for KTM. Here's a tip though: If you buy it in the grey box (from Vertex itself), it should be roughly $20-$30 cheaper than the orange (KTM OEM) box, even though they are exactly the same.
logan_140
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logan_140 7/14/2015 8:48am
7/14/2015 8:48am
Fearo wrote:
Yes, Vertex is stock for KTM. Here's a tip though: If you buy it in the grey box (from Vertex itself), it should be roughly $20-$30...
Yes, Vertex is stock for KTM. Here's a tip though: If you buy it in the grey box (from Vertex itself), it should be roughly $20-$30 cheaper than the orange (KTM OEM) box, even though they are exactly the same.
Gotcha thank youSmile
markit
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markit 7/14/2015 9:49am
7/14/2015 9:49am
Actually the Pro x's are made by ART (stock yamaha) All the above are great quality pistons. The wisco's are forged high performance pistons and have a longer life span, there just better made due to being forged. Cast are fine as long as you stay within 50 hrs.
logan_140
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logan_140 7/14/2015 10:42am
7/14/2015 10:42am
Is the vertex piston forged? I believe so just want to make sure
karlz
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karlz 7/14/2015 1:35pm
7/14/2015 1:35pm
logan_140 wrote:
Is the vertex piston forged? I believe so just want to make sure
vertex are cast with a high silicone content.
logan_140
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logan_140 7/14/2015 1:54pm
7/14/2015 1:54pm
logan_140 wrote:
Is the vertex piston forged? I believe so just want to make sure
karlz wrote:
vertex are cast with a high silicone content.
Cast last longer right? And tighter fit?
nage0139
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nage0139 7/14/2015 2:17pm
7/14/2015 2:17pm
You can make any piston fit tighter tolerances: depends on who is doing to the boring and matching. I prefer forged pistons myself, but if you don't know what you're doing you can cold seize them. Forged pistons expand more than cast, forged piston stronger than cast, etc.

Good read:
http://motocrossactionmag.com/news/the-tortured-life-of-the-piston-in-y…
logan_140
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logan_140 7/14/2015 6:09pm
7/14/2015 6:09pm
nage0139 wrote:
You can make any piston fit tighter tolerances: depends on who is doing to the boring and matching. I prefer forged pistons myself, but if you...
You can make any piston fit tighter tolerances: depends on who is doing to the boring and matching. I prefer forged pistons myself, but if you don't know what you're doing you can cold seize them. Forged pistons expand more than cast, forged piston stronger than cast, etc.

Good read:
http://motocrossactionmag.com/news/the-tortured-life-of-the-piston-in-y…
Not boring it... It's only got 25 hours on the bike
Eversole
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Eversole 7/14/2015 6:25pm
7/14/2015 6:25pm
Go with OEM, if you use something else, you'll have problems. The only time you shouldn't use an OEM piston is when it's been bored.
logan_140
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logan_140 7/14/2015 6:27pm
7/14/2015 6:27pm
Eversole wrote:
Go with OEM, if you use something else, you'll have problems. The only time you shouldn't use an OEM piston is when it's been bored.
Vertex is oem for ktm

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