2 Strokes Down Under

Hey
I have purchased 2017 tx 300 husky about 6 months ago.....bike was going fine until original plug fouled up at around 21 hours since then I've been fouling a plug on average every two hours.. I asked local mx shop they said it would be a jetting problem if so

What caused the need for rejettin?
And what jettin would I adjust it to?
Could it be something else?

Is it worth checking if the air filter is blocked, as that would affect the mixture and possibly make the bike run rich.

Rgds
Ozhammer

B, the 2017 Husky/KTM 2Ts changed to Mikuni TM carbs, I'd suggest checking a dedicated site on the 2T KTM/Husky,
& seeing if your plug issue is a common problem & what the usual fix is..

In general, with today's powerful ignition, such fouling problems are a either a carb tune/premix issue,
or maybe you are not running it hard enough to burn the deposits off the plug/plug is too cold range for riding style..

Have you recently changed supplier? Its well known that there are a lot of fake sparkplugs about.