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If you are also experiencing unexplained losses of power at any speed in any gear, or if the engine is pinking, the problem is likely to be the valve-stem seals. It is also highly likely that you are loosing compression in one or more cylinders. This could be down to heavy scoring on the bore, or a damaged or worn piston and / or rings. Also check valve clearances / injectors for obstruction / wear, exhaust pipes for loss of back-pressure, spark plugs & HT leads for correct gap or damage / wear, valve timing, and the carburettor, air filter & fuel hoses for blockages & dirt.

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Q: What should be check if a Yamaha YZF keeps stalling?
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