What is this noise? fireblade 954rr

While bleeding the cooling system, Which is taking sometime in doing i have come across this noise which can be heard a few times in the video. The revs drop when this happens.

[@blackbirdxx928]

Hard to tell on vid...maybe a carb sneeze? Lean mix at idle, tight intake valve

[@sancak099]

954 injection

[@matthunziker3498]

mine does the same the idle slows a bit and a slight clunking sound

[@DrInsane76]

I think it has something to do with the switch that is operating the fan? Did you remove the spark plugs? If you are running stock ECU than mabe the spark plugs are not happy with the rich setting and they just misfire sometimes?

[@SuperKaamio]

I know this is an old vid. But nevertheless I wouldn't be worrying about anything else but that "coins-in-a-purse" sound which tells me you'r running a stock cct? For the future internet people: Make sure you replace your stock cam chain tensioner with a manual one. Those stock ones are known to fail at about 30 000km and cause a major engine damage to valves and pistons!

[@reinwillemvanderwal5726]

@ Did you solve this/found out the problem? Mine is doing exactly the same...

[@batinblade]

Did yiu fixed it and what was the cause?

[@batinblade]

What was the solution for this issue?

[@racing0eagle]

Did you solve the problem? I have same problem and it drives me crazy

[@batinblade]

Did you fixed it and what was the cause?

[@nickmanuel4297]

Did you ever figure it out? My 954rr is doing the same thing.

[@reinwillemvanderwal5726]

Same here, do you know what it is?

[@nickwelch5267]

@@reinwillemvanderwal5726 look up honda 954 alusil..

[@batinblade]

how about you? Did you ever figure out what it was?

[@batinblade]

Did you fixed it? What was the cause