Some VTR1000's had a problem with the cam chain tensioner on the front cylinder. If this is left the chain can become so loose it skips a few teeth on the cam sprocket and bends the valves. If you can locate the tensioner, remove the centre screw with sealing washer from it, insert a small flat blade screwdriver in and run the engine. you will feel the screwdriver shake about if the tensioner has gone.
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