yz426 fouling plugs

YZ 426 started fouling plugs after 5-6 hours of ride time, didn't use to...anyone have an idea why???

Did you try a new plug in it? Maybe some bad gas?

Can almost guarantee bad fuel. If you search, we had a thread going on this in the last couple weeks. Lot's of good info.

Did you try a new plug in it? Maybe some bad gas?

thanks, I'll try something different.

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