Weird clicky noise coming from CBR400RR engine

[niteblade]

my brother bought a cbr400RR recently. it runs well and stuff. but there's a weird clicky noise coming from the engine.

double checked with my dad's super 4 and my NC35. our bikes dont have the sound.

we brought it back to the shop for a check but the mechanic says its just a loose screw and they fixed it. however the noise is still there.

anyone knows what the problem could be?

[angry_rob]

It could be that the valve clearances need doing, as they progressively get less accurate it makes a bit of a tapety noise, at least that's what I've noticed. Then again I may just be nuts.

[leopard_pagan]

is it intermittent?
if so its just the fuel pump points you can hear.. nowt to worry about

[Matchlessman]

Is it rev dependent? It could be the start of a hole in the exhaust.

[kiwi racer]

Lets face the reality folks , its a noise at issue here and as good as we may think we are a noise can only be diagnosed by hearing it , not by this format.

[Matchlessman]

True enough but at least we can give him things to look at and check.

[adz400]

ive had my cbr a couple of monthes now and also have heard a clicking noise. seems to be coming from the carbs. only happens when the fuel is low so the fuel pump theory could be true. although i didnt think they had fuel pumps???.

[Davez29]

one more thing to try although not exactly a clicking noise, pull the clutch in see if its still there. adz400 the cbrs do have a fuel pump for sure.

[Matchlessman]

If you leave the fuel turned off with the bike running for a couple of minutes and you will hear the fuel pump ticking noise.

[Mikiboy]

I had a CBR4 whuich i changed the engine. That clicked for about 8 months then stopped. I never managed to figure where it was coming from or what caused it.
I changed it as the original one was had it. You could hear a tinkling noise before it let go, though I guess I'd ran it like that for a year or so.