Grade of SS Used on KTM Exhaust Headers?

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4/3/2018 9:42 AM

Anyone in the know or know of someone who would know? I'm working on making some mods to a KTM Header.

Thanks

Tim

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Germany 1975 250 CZ Centerport, laydown shocks, mikuni with reed valve, Marzocchi forks with me as the motopilot

4/3/2018 9:55 AM

Probably just 304 or 316 as they're the most common.

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4/3/2018 9:59 AM

when in doubt use a 309 wire on most all stainless .

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2018 crf 250r

4/3/2018 10:00 AM
Edited Date/Time: 4/3/2018 10:05 AM

Most likely 304. Just use 308/309 filler and you'll be safe. It most assuredly won't be a grade above that. You can use 316 but it's unnecessarily expensive. I've welded on a couple KTM pipes (and FMF and PC) using 316 with no problems. Also Weldmold 880 works really well if you can get it.

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4/3/2018 10:03 AM

Thanks - I take it the stock color of the KTM header pipe has nothing to do with the grade?


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Germany 1975 250 CZ Centerport, laydown shocks, mikuni with reed valve, Marzocchi forks with me as the motopilot

4/3/2018 10:06 AM
Edited Date/Time: 4/3/2018 10:07 AM

Tim507 wrote:

Thanks - I take it the stock color of the KTM header pipe has nothing to do with the grade?


"Stock color" meaning a header with no heat put through it? They change color very soon after just a few heat cycles. Take a red scotch brite pad to it to get to the raw metal.

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4/3/2018 10:16 AM

347 is the go to wire for unknown stainless around these parts

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