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03 ktm 125sx jetting issue

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I have a 2003 ktm 125 sx that sputters when its full throttle its not over reving im pretty sure its either an air issue or jetting, the air filter is clean the mods on the bike are

Vforce3 reed

fmf gold series pipe

The bike also is some how converted to high compression its runs on avgas about 100 octane could that cause sputtering in high revs?

:thumbsup:

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