Simple Guide to engine noises - TwoWheelForum: Motorcycle and Sportbike forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 36 (permalink) Old 12-24-2006, 11:14 PM Thread Starter
 
Join Date: Sep 2006
Posts: 114
Simple Guide to engine noises

NOTE: Take into account that not all engine noises are abnormal and may be actually considered normal by the manufacturer please check before making asumptions!

Right this is a guide that will guide you with engines noises and what the possible causes maybe! Also make a note of the condition the motor is in when reproducing the noise!

TOP END NOISES

Ticking ---> Low to high RPM's hot or cold ---> Valve adujustment, bent valve/ valve seat. Excess valve stem to valve guide clearence

Ticking ---> Low to high RPM's hot ---> excess pad to lifter clearence, Lifter shape, lifter-to-cylinder head clearencem worn camshaft lobes/rocker arms

Ticking/Clatter ---> Idle to mid-range, hot or cold ---> loose cam chain

Clatter ---> Primarily at idle, hot ---> Camshaft end play

Knocking ---> Idle to mid-range, hot or cold ---> Camshaft end play thrust clearence. Loose cam sprocket bolts

Rattle/slapping ---> Idle to low speed, Primarily hot ---> excessive piston-to-cylinder clearence

Rattle/Pinging ---> Mid to high range, under load, hot --> Detonation


Bottom End Noises

Knocking ---> Idle to mid-range or specific RPM, hot or cold --> loose exhaust system or broken internally

---> Accelerating, decel, hot or cold ---> Loose primary chain, primary drive gear nut

---> Primarily at idle, hot or cold ---> Crankshaft end play

---> Idle to mid-range, primarily hot ---> Improper rod bearing

---> Idle to mid-range, under load, hot ---> excess main bearing clearance

Rattling ---> Idle to mid-range, hot or cold loose cam chain

Chattering ---> Low to mid-range shifting under load ---> worn friction plates or clutch housing

Whirring ---> All speeds, Primarliy hot ---> worn main bearings

Tick or Clunk ---> Low to high RPM's, one or more gears, hot or cold ---> Transmission

Howling,grinding,squealing ---> low to high RPM's under load, all gears, clutch in or out, hot or cold ---> Improper tooth contact, Improper backlash in primary, middle or final drive gear!

Remember! the conditions stated here will not always apply to your bike but might always be the same problems, and the problems stated are only POSSIBLE CAUSES not actual problems, also when listening to your motor be very carful becuase the noise you hare from one part of the motor may actually be comming from a completely different area! its best to use a pair of engine stethoscopes from harbour freight or if your too ghetto just use a hefty sized wrench to carry the engine vibrations well
KillerR33d is offline  
Sponsored Links
Advertisement
 
post #2 of 36 (permalink) Old 12-24-2006, 11:21 PM
 
Join Date: Nov 2006
Posts: 5,720
great post. repped
NONE_too_SOFT is offline  
post #3 of 36 (permalink) Old 12-25-2006, 05:38 AM
 
Join Date: Dec 2005
Posts: 7,007
New to me but great post
1BadCBR is offline  
Sponsored Links
Advertisement
 
post #4 of 36 (permalink) Old 12-25-2006, 11:35 AM
 
Join Date: Oct 2004
Posts: 6,147
bumblebee is offline  
post #5 of 36 (permalink) Old 12-25-2006, 02:08 PM
V-Twin Moddin
 
Gas Man's Avatar
 
Join Date: Jul 2004
Location: SE Michigan
Posts: 38,916
REPT!




-Chris
aka Gas Man



Was: 2002 Kaw ZX-9R
IS:


is me till the
Gas Man is offline  
post #6 of 36 (permalink) Old 12-25-2006, 05:43 PM Thread Starter
 
Join Date: Sep 2006
Posts: 114
Thanks all! i hope this will help everyone when there i diagnosing their motors, i might be a little bit optimistic here but maybe this should become a sticky?
KillerR33d is offline  
post #7 of 36 (permalink) Old 12-25-2006, 06:52 PM
 
Join Date: Aug 2006
Posts: 3,420
byron12 is offline  
post #8 of 36 (permalink) Old 12-25-2006, 11:23 PM
 
Join Date: Jul 2005
Posts: 24,016
Quote:
Originally Posted by NONE_too_SOFT View Post
great post. repped




marko138 is offline  
post #9 of 36 (permalink) Old 12-26-2006, 08:50 PM
 
Join Date: Oct 2004
Posts: 6,147
bumblebee is offline  
post #10 of 36 (permalink) Old 12-27-2006, 10:28 AM
 
Join Date: Oct 2006
Posts: 76
well wht about when ur bike runs good till 9 grand and then its like it chocks it self and there is no more power...through all gears...cant even hit 100mph...and cant rev it past 9.5 to 10 grand so if someone knows how to fix it..let me know
SMFB636 is offline  
post #11 of 36 (permalink) Old 12-27-2006, 11:26 PM
 
Join Date: Jul 2005
Posts: 24,016
Quote:
Originally Posted by SMFB636 View Post
well wht about when ur bike runs good till 9 grand and then its like it chocks it self and there is no more power...through all gears...cant even hit 100mph...and cant rev it past 9.5 to 10 grand so if someone knows how to fix it..let me know
Get out the service manual.



marko138 is offline  
post #12 of 36 (permalink) Old 12-28-2006, 08:46 AM Thread Starter
 
Join Date: Sep 2006
Posts: 114
Quote:
Originally Posted by SMFB636 View Post
well wht about when ur bike runs good till 9 grand and then its like it chocks it self and there is no more power...through all gears...cant even hit 100mph...and cant rev it past 9.5 to 10 grand so if someone knows how to fix it..let me know
It could be many things happening! no compression, high leakdown etc, Did you rev the absolute be-jesus outta that motor when you got it it may contribute to a motor's early demise

Get the manual out before doing anything
KillerR33d is offline  
post #13 of 36 (permalink) Old 12-28-2006, 11:52 PM
 
Join Date: Jul 2005
Posts: 24,016
Quote:
Originally Posted by KillerR33d View Post
It could be many things happening! no compression, high leakdown etc, Did you rev the absolute be-jesus outta that motor when you got it it may contribute to a motor's early demise

Get the manual out before doing anything
Nice work.



marko138 is offline  
post #14 of 36 (permalink) Old 12-29-2006, 11:56 AM
Contest Winner
'07 Rally Veteran
November 2007 BOTM Winner!
 
Join Date: Apr 2005
Location: Cbus, OH, and about 100,000 posts behind the post whore
Posts: 7,649
Send a message via AIM to drewpy
Quote:
Originally Posted by SMFB636 View Post
well wht about when ur bike runs good till 9 grand and then its like it chocks it self and there is no more power...through all gears...cant even hit 100mph...and cant rev it past 9.5 to 10 grand so if someone knows how to fix it..let me know


sell your harley



.... but if its not a oil leaker, read the manuel or take it to a trust worthy mechanic



"It takes alot of anything to make my bike to something"
2001 RC51
drewpy is offline  
post #15 of 36 (permalink) Old 01-02-2007, 04:31 PM
 
Join Date: Oct 2006
Posts: 76
when i bought it it had 8,500 miles and toped out at 180.....and since the butterfly exhaust valve went out it just has went down hill.......and i tried looking at the service manual and it doesnt tell me anylike whts happening....so wht should i do
SMFB636 is offline  
post #16 of 36 (permalink) Old 01-10-2007, 02:48 PM Thread Starter
 
Join Date: Sep 2006
Posts: 114
buttery fly valve? almost all motors have poppet valves within the engine...unless you mean the servo-controlled valve(power valve) that sits in the collector, apart from that im afraid i don't know what your going on about
KillerR33d is offline  
post #17 of 36 (permalink) Old 01-10-2007, 02:55 PM
 
Join Date: Feb 2005
Posts: 17,886
You're gonna get valve noises out the box from most 600's. It's what they do.
DLIT is offline  
post #18 of 36 (permalink) Old 01-10-2007, 03:08 PM
TWF Board Of Directors
 
Join Date: Jun 2006
Posts: 10,074
Quote:
Originally Posted by DLIT View Post
You're gonna get valve noises out the box from most 600's. It's what they do.
My 750 makes ticking noise but I cant tell if its just normal FI noise or if the valves ticking.
Rider is offline  
post #19 of 36 (permalink) Old 01-10-2007, 03:11 PM Thread Starter
 
Join Date: Sep 2006
Posts: 114
The injectors themselves do make a faint ticking noise. just grab a hefty sized wrench and have a listen...you be surprised all kinds of weird noises motors makes
KillerR33d is offline  
post #20 of 36 (permalink) Old 01-10-2007, 03:18 PM
 
Join Date: Sep 2004
Posts: 1,210
I'm calling bs on the whole thing, the chances of diagnosing a engine problem by noise alone is slim to none @ best.

Twisty had a tick in his TL and the dealer said it was normal. 1000miles later the cam scissor gear let loose grenading the whole motor....If the tick is not normal to you, take it to the dealer and demand it be fixed. If your turned away, call the manufacturer customer service line and report it. The dealers are very often wrong...

Also most in-lines will make a little chatter in the valves due to VVT.
Pippi is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TwoWheelForum: Motorcycle and Sportbike forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome