CB400 NC31 Idle Adjustment

[mr.lonely]

hi ,
can anyone provide me info. i wasnt actually sure , i have a cb400f2 nc31 i just needed to know, does it use a timing chain or cam gears like the cbr?
Reply will be really appreciated.

Thanks

[RICKNC31]

Hi the NC31 uses a cam chain with automatic adjustment it was only the early CB1 that used the CBR cam gear drive. This was probably a noise and cost reduction thing by HONDA but the cam chain fitted is a good system so no worries all the best rick

[mr.lonely]

thank you for your reply, i thought cam gears were a better option?
how many km later does the chain wear out? any ideas?
actually when i start my bike during the morning time or after like half an hour from the time i switch it off, i hear some knocking noise, sometimes like also a metal to metal scratching noise, i was thinking maybe it is the timing chain? is it normal? or is it a problem? any ideas , i get worried at times thinking if its something serious.
have you faced any problem such as that?
Reply will be really appreciated.

Thanks

[mr.lonely]

and that sound lasts for 3 min , max 5 min than it goes away.