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KTM MX & Off-Road Dirt Bikes
KTM Top end question
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[QUOTE="GlennP, post: 25289, member: 18736"] The stock KTM piston is an ELKO, an excellent forged unit that I believe is made in the Netherlands. From my experience with three 300 EXCs, They last from one to two seasons, but get pretty loose at the end of the second season. We tried a Wiseco in my buddy's 300 EXC, and got one season out of it with good performance, although top end noise was greater than with a new stock piston, telling me clearances were on the loose side. In a GasGas, there are four micro sizes of Wiseco (OEM) available to match different bore tolerances (A,B,C,D)like the KTM #1 and #2 cylinders and #1 and #2 ELKO pistons. When you use a Wiseco KTM replacement, where does the size fall? In #1, #2, or in between? When we tried one, there was only one size available. I don't like to keep a piston in longer than 1 season anyway. Try the Wiseco and monitor compression and noise to guage life. Measure it and your bore to determine clearance, and use a three point bore mic if possible. I did not have good enough tools at the time we used one. The GasGas motor has good compression and very little mechanical top end noise after 1 season, so I can't say that the piston is inferior to the ELKO. Glenn '00 GasGas XC250 [/QUOTE]
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KTM MX & Off-Road Dirt Bikes
KTM Top end question
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