knocking sound

:thumbsup: I'm sure you've heard it before but there is a knocking sound coming from the engine of my 2000 WR400. I am not overly good mechanically but i like to try and learn.

Using the manual i checked the clearances and assuming i did it right they are within spec. It said to put the line in the centre of the inspection hole which would be top dead centre. The only markings i could find where "H I" so i lined up the 'I' and checked the gaps. Is this correct or have i got no idea?

If it is correct what else could the sound becoming from?

Cheers Dan

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