I've Got a 'Clunk'
06-28-2007 | 07:00 AM
#1
Thread Starter
Junior Member
Squid
Joined: Jun 2006
Posts: 27
From: Jacksonville, NC
I've Got a 'Clunk'
Recently I've noticed a 'clunk'. 
What kind of clunk you might be thinking. Well that's my question to you. 
I only notice it when I'm sitting at a stoplight. Engine is idling away and everyone is happy. Then 'clunk'. It's not terribly loud. Actually you can barely hear it. But I can feel it though my *** and definately through the bars. It'll only 'clunk' once at a time and feels pretty solid if that makes any sense. It'll do it once or twice per minute. I want to say it's coming from the bottom of the engine but I can't be sure.
Any ideas? I know it's not the dreaded CCT's. I've been down that path before and the sound is completely different. It's not a ticking, it's a 'clunk'.
The bike is an '01 with 24,000 miles. Two Bros pipes. Otherwise it's stock. Prior owner rejetted and if anything it's running rich. I still need to pull the carbs to check what jets I have.
What kind of clunk you might be thinking. Well that's my question to you. I only notice it when I'm sitting at a stoplight. Engine is idling away and everyone is happy. Then 'clunk'. It's not terribly loud. Actually you can barely hear it. But I can feel it though my *** and definately through the bars. It'll only 'clunk' once at a time and feels pretty solid if that makes any sense. It'll do it once or twice per minute. I want to say it's coming from the bottom of the engine but I can't be sure.
Any ideas? I know it's not the dreaded CCT's. I've been down that path before and the sound is completely different. It's not a ticking, it's a 'clunk'.
The bike is an '01 with 24,000 miles. Two Bros pipes. Otherwise it's stock. Prior owner rejetted and if anything it's running rich. I still need to pull the carbs to check what jets I have.
06-28-2007 | 07:31 AM
#3
Senior Member
SuperSport
SuperSport
Joined: Dec 2006
Posts: 880
From: Victoriaville, Quebec, Canada
I'm thinking of a backfire, is this clunk slowing down the engine, if so it's a backfire, if not, it may be a timing chain issue, but there is many parts that can cause weird noises.
06-28-2007 | 08:38 AM
#5
Thread Starter
Junior Member
Squid
Joined: Jun 2006
Posts: 27
From: Jacksonville, NC
The last thing I'm going to do is rule anything out. I'll pull the plugs and check them. They've only got about 3,000-4,000 miles on them but you never know.
However my gut tells me they will be fine. It feels more mechanical. The engine doesn't sputter or cough. It feels like to objects are binding and releasing or something making contact with something else. I'm being vague as I have no idea what it could be.
I'll check the plugs and let you know what I find. Thanks guys!
However my gut tells me they will be fine. It feels more mechanical. The engine doesn't sputter or cough. It feels like to objects are binding and releasing or something making contact with something else. I'm being vague as I have no idea what it could be.
I'll check the plugs and let you know what I find. Thanks guys!
02-13-2009 | 09:25 AM
#10
Senior Member
SuperBike
Joined: Feb 2007
Posts: 1,051
From: Portland, Oregon
i agree it sounds like an air/fuel adjustment issue... yes my bike did the same thing & it does sound mechanical to me ( i about $hit the first time i heard it )
a quick identifier is how stable the idle is.
pull the carbs and find out what idle jet are you running & how many turns out. ever sync the carbs ?
tim
a quick identifier is how stable the idle is.
pull the carbs and find out what idle jet are you running & how many turns out. ever sync the carbs ?
tim
01-20-2011 | 05:48 PM
#14
Über Member
Superstock
Joined: Aug 2010
Posts: 293
From: Virginia Beach VA.
01-20-2011 | 06:58 PM
#15
Banned
MotoGP
Joined: Aug 2007
Posts: 5,942
From: Lake View Terrace, CA
Actually it controls fuel not air, so you turn it out to richen the mixture.
They are located on the bottom of the carb. There is no cap on it but it does have the Honda "D" shaped head.
To adjust them on the bike you need a Motion Pro 90 degree wrench like this:
http://www.motionpro.com/motorcycle/partno/08-0229/
or something similar.
You can also pull the carbs and set them. While not as precise as doing with the engine running it does work pretty good.
You will still need to purchase a "D" driver or you can dremel a screwdriver slot in the end of the screw and then adjust away.
They are located on the bottom of the carb. There is no cap on it but it does have the Honda "D" shaped head.
To adjust them on the bike you need a Motion Pro 90 degree wrench like this:
http://www.motionpro.com/motorcycle/partno/08-0229/
or something similar.
You can also pull the carbs and set them. While not as precise as doing with the engine running it does work pretty good.
You will still need to purchase a "D" driver or you can dremel a screwdriver slot in the end of the screw and then adjust away.
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