Check your bike's Airfilter

Not preaching to the knowledgeable

Took the Unifilter foam airfilter out of my XChallenge this afternoon and I've never seen some much sand and dust in an airfilter before

There was plenty of dust/sand/debris in the 'dirty' side and the engine side was ok

Washed it out in airfilter solvent (loads of the crap left in the solvent)

I recommend that you have a look at yours too and clean (foam) or replace (paper) for the sake of about £12 on a big GS

That's all folks.............