KTM Piston Height

KTM Two Stroke 12/31/2017 2:40am
12/31/2017 2:40am Edited Date/Time 1/5/2018 2:56pm
When i replaced the Piston from my 150 KTM
this Year in May i noticed that the New Piston was 0.6mm
higher than the OEM Piston.

It was a bit strange to me but i stack one more
Basegasket under the Zylinder and the Dimension X
was OK.

Last Week i Order a new Wössner Piston again and it has the same size like the OEM ???

I measure from Piston Top to Piston Pin Top
22,60 to. 22,00mm
Has anybody Seen this before on another Piston Manufacturer??

Write an E-Mail to Wössner but they are on Christmas Holiday
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Tracktor
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Tracktor 12/31/2017 5:47pm
12/31/2017 5:47pm
Overall piston height isnt as important as wrist pin to crown measurement. That & squish/deck height is what you need to be checking....
Bruce372
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Bruce372 12/31/2017 9:01pm
12/31/2017 9:01pm
Tracktor wrote:
Overall piston height isnt as important as wrist pin to crown measurement. That & squish/deck height is what you need to be checking....
Bingo.... there is a difference between piston height and length!
BobPA
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BobPA 1/1/2018 12:19am
1/1/2018 12:19am
LOOks like he has a wrist pin in the pistons...

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KTM Two Stroke 1/1/2018 2:31am
1/1/2018 2:31am
Tracktor wrote:
Overall piston height isnt as important as wrist pin to crown measurement. That & squish/deck height is what you need to be checking....
I know this measurement was from wrist Pin to Top
and on the Picture you can See the Pin was in both Piston inside, and i have a difference from 0,6mm

It was the same Piston Brand with the same Ordernumber.
That is what i can not understand??
ktm-5
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ktm-5 1/2/2018 3:36pm
1/2/2018 3:36pm
That's probably y it's best to stick with oem. Imo
Acidreamer
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Acidreamer 1/3/2018 2:28am
1/3/2018 2:28am
Whatever brand of piston you bought (wossner?) clearly has quality control issues. In our piston machining division something like this is unacceptable. Parts cannot vary like that. I dont even know how they would vary on a cnc running the same program. Those machines are within .001” repeatability.

Anyways buy OEM, Wiseco, JE, or CP pistons and nothing else. Theyre all very reputable & make solid shit.
KTM Two Stroke 1/3/2018 11:23am
1/3/2018 11:23am
Acidreamer wrote:
Whatever brand of piston you bought (wossner?) clearly has quality control issues. In our piston machining division something like this is unacceptable. Parts cannot vary like...
Whatever brand of piston you bought (wossner?) clearly has quality control issues. In our piston machining division something like this is unacceptable. Parts cannot vary like that. I dont even know how they would vary on a cnc running the same program. Those machines are within .001” repeatability.

Anyways buy OEM, Wiseco, JE, or CP pistons and nothing else. Theyre all very reputable & make solid shit.
Wössner is a famous Piston Manufacturer here in Europe, very reliable and good quality
I know that a normal Manufacturing Tolerance is in the 0,01mm Area.
As i said i write an E-Mail to Wössner to claify this Problem.
six10
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six10 1/5/2018 2:56pm
1/5/2018 2:56pm
It is a bit odd to have this big of a diffrence, but than again, thats why you have the x-dimension that you have to check.

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