sudden rattling noise

hi guys, today while riding bike developed a funny rattling noise. stopped to check if something like headers got unscrewed but could not find something.
i start her again and at idling there was no sound at all-it sounded like usuall. when i twist the throttle a bit it does make this rattle, it is present when rpms are above 3000-3500 rpms. it sounds like something metal part gets coordinated with the motor frequencies.

ok, went immediatelly home and open the head cover then the head and finally i removed the cylinder to check the piston and the con rod . everything seems to be in perfect condition ( THE BIKE IS RECENTLY REBUILDED WITH PISTON ROLLERS NUTS AND STUFF)

then i openeded the clutch cover for a visual inspection but with no luck :cry:
anyway re assembled again-started but still the same :evil:

note that at idling it sounds sweet as before.

it runs also very powerfull as before.

it might be something really really stupid but maybe not.

3 days ago i changed the whole clutch assebly using 2000 model parts which were used but in perfect condition compared to mine.

hope to sort it out :wink:

thanks for the feedback, a stethoskope is indeed a good idea :wink:

hey markt nice to hear that we have propably the same problem i hope it will make it easier to find out the source
yesterday i checked piston-cam-valves-followers-rollers-con rod and stuff, they are excellent. the cam chain tensioner is about 4 notches before end.

primary gear is tight and no broken teeth on it or on the basket.
i did not dissasemble the clutch though.

cam chain is a suspect as you correctly mentioned, but i have not heard any berg with loose chain so i don't know how it suppose to sound.

my piston is new , just 8 hours on it :wink:

i already ordered a chain, regina..