xr400 problems.

somebody please help!!!!

went out on my xr the other day,and noticed every so often a metallic 'knock' it only does it in top gear cruising about 50mph,i went home and checked the oil which was very low,i decided to change oil and filter,there seem to be no metallic particles in filter so hopefully it is not engine damage.

one of my mates at work suggested changing chain and sprockets(chain is very loose),he reckoned it could be chain noise.surely if there was engine damaged there would be noises all the time,even on stationary tick over. i would be most grateful for any ideas.

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