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Revs sudden drop

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Several times today the revs suddenly dropped on my 4RT while I was sitting in a queue waiting to go in to a section. The bike seemed ok all the rest of the time but I've never noticed it before. Is it a symptom of something waiting to fail?

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Water in fuel?

Could be as it was quite wet through one section. I'll check the air filter and air box for signs of water when I clean it during the week.

Could it be potential symptoms to anything else?

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