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Ktm sx 125 spluttering/ backfiring.

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Need help with my ktm sx125.

Basically every time i ride slow with about 1/4 throttle for about 5 mins then go to full it will start spluttering and backfiring. When it does this if i give it loads of revs it clears and runs fine again.

If i dont ride flat out it just runs crap.

188 main jet.

Clip on 3rd position.

1.5 turns on air screw.

Not sure about the other jet but there all standard.

Running 40;1 mix with fresh fuel and motul 2 stroke.

Fresh top end and good reeds.

Air filter is clean.

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