Hi again Phil,
I was just reading on "equipping the bike" forum about K1N filters which seems to be a no good investement for a dirt bike.
I think also exhausts are not always a good investement, as they could damage valves; to much oxygen creates to much heat and seal will damage, so I think exhaust might be the guilty in your case, but I could be wrong.
Once I had a triumph with ducati exhausts and mechanic told me that the only good thing with it was the sound..the rest was only bad as lower power, more heat on valves, etc etc.
Do you have a non OEM exhaust?
Cheers,
Matt
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