hi thats my video (i feel proud) the best way to test it is to sit still with youre front brake on put it in gear and give it some revs and try to drive forward the knock will get really bad and sound quiet nasty and always does it on accelaration and decalaration. somewhere on here u will find my right up videos and pictures there is also another of my vids on youtube that show the exact problem. to me it sound like i had killed the bottom end as the sound was coming from just behind and slightly deeper into the motor but the noise mostly disapears under constant speed and revs. i was told by 4 diffrent bike mechanics that it sounded "course" and they could here what i was listerning to but said its just a big single and they are clunky. im pretty sure from what i have red above it is the same thing and if you are slighly mechanical minded all it will cost you is a oil and antifreeze change some locktite and some instant gasket for the rebuild i did mine around 12000 ish (check other article will be more acurate) and im now on 16000 and she is sweet as a nut (HAHAHAHAHAHAHA JUST GOT TO THE BOTTOM COMMENT AND SEEN YOU FOUND THE PROBLEM LOL SORRY LOL IT IS 2.44 AM LOL GLAD YOU FOUND IT . ASH

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Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen