My motorbike has been suffering from an issue which goes like this . Whenever I drive for a few kilometres a smell comes from the engine oil sump area even if the engine oil is brand new . One year ago when I replaced this engine oil with another then that particular issue dissappeared . Now it makes me confused whether this problem was due to engine oil or other else

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Is the coolant circulating OK, and does the coolant temperature behave as it should? How about the oil - can you check that it's actually circulating round the engine? How's the oil pump? (I'm just throwing guesses out by the way - I'm not sure if motorbike engines even have similar cooling systems to what you'd find in a car).

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