Seems I have this noise Im pretty sure its coming from the flywheel
Can you have a listen to these two vids of it its a bit hard to tell as bike has plug and pipe removed and turning engine over with rear wheel. Piston and barrel look great, have just got all the parts to do the topend so would like to try sort this out at the same time.
Is it possible have a cracked magnet in the flywheel and be flicking around as thats what it sounds like.
Best heard from about 25 sec on
https://www.youtube.com/watch?v=w7Tl...ature=youtu.be
https://www.youtube.com/watch?v=93qL...ature=youtu.be