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Male WalkingWounded
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Question About KTM 350 Top End Reply to this Post

My 17 KTM 350 has 163 hours. The fork seals survived for 100 hours. The chain slider, guide and protector made it to 162 hours. The rest of the bike is original other than tires, chain, and sprockets.

My top end is original too. Compression is still good, and it lites off well in cold weather too, but my fear is fatigue of the piston. I want to replace before it makes me step through the bars on a jump, and makes a mess of me and the engine.

I want ot use an O.E. piston, and not sure where to purchase one. I've heard that the piston is not made by KTM, but either Namura, Wiseco, Wossner, ProX, Vertex, JE, Mahle or some other brand.


I'm wondering if the piston made by "company A" for KTM, is the same one that would that "company A" would send to an Mx store for a KTM, or, are they more precise with the ones that go to the plant/factory?
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Monty 14 KTM250SX's 2017 KTM350SX-F #045 - A Lot Of Pit Bikes, And Added Another One
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Male rick61
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Re: Question About KTM 350 Top End Reply to this Post

Buy the piston that comes with the coolest sticker...
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Male WalkingWounded
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Re: Question About KTM 350 Top End Reply to this Post

I am a sticker hound, so that may be plausible.

I don't have a problem with an aftermarket piston, as long as it is as dependable and as durable as what came in my bike.
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Baby Shark, do do do do do , Baby Shark

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Monty 14 KTM250SX's 2017 KTM350SX-F #045 - A Lot Of Pit Bikes, And Added Another One
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Male rick61
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Re: Question About KTM 350 Top End Reply to this Post

Which ever you decide, get a fresh bore.. cant hurt.
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Gatorade,Advil & Cosmic Brownies.

75 360 Pursang
79 YZ 125
79 YZ 250
84 YZ 125
86 YZ 490
81 RM 250
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Male Bigmaico
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Re: Question About KTM 350 Top End Reply to this Post

Monty

If I Remember right your KTM uses a Vertex piston.

But your best bet would be to get a Oem piston, as KTM May have Vertex produce the piston to their own specifications.

.then all you need to do is check the bore to make sure that?s its true & has no ridges in it.
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Male WalkingWounded
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Re: Question About KTM 350 Top End Reply to this Post

Yes, that was my thought, that whoever makes it for KTM, may not make it as precise for the aftermarket vendor world.

I'll call Munn for all the parts just to be sure.
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Monty 14 KTM250SX's 2017 KTM350SX-F #045 - A Lot Of Pit Bikes, And Added Another One
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Male bclick
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Re: Question About KTM 350 Top End Reply to this Post

they make a kit with piston, jug and all gaskets thats under 500 bucks,,,never hurts to clean up valves if you are down to that point,,,i had over 200 hrs on my 14 350 and did a top end but it looked really good ,,never a bad thing to fix it before it breaks,,,
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