Valve Adjustment Experience - Yamaha R6 Forum: YZF-R6 Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 11-14-2012, 11:16 AM Thread Starter
Just made this great wheelie.. did you see it?!
 
Stubbz's Avatar
 
Join Date: Dec 2008
Posts: 62
Valve Adjustment Experience

who has done or checked valves on R6's? what mileage did you check and what did you find on the first check?

Reason i am asking, i have an 05 R6 with 10k miles, motor is out of the bike so i thought id check the valves, did it by the book with each piston at TDC verified and with cam lobes facing out away from one another like book said. Buttt with only 10k miles on my bike all of my exhaust valves are to tight and 4 out of the 8 intakes are tight also, the other 4 intakes are in the preferred location of .15

that leads me to believe i did it 100% correct but only having 10k miles im not sure why i would have so many valves tight. bike has had a stock pipe on it its whole life till i got it 2k miles ago and seemed to be babied as its literally showroom clean.

Cyl #1 Ex .203 .203 IN .152 .152
Cyl #2 EX .203 .203 IN .127 .127
Cyl #4 EX .203 .203 IN .152 .127
Cyl #3 EX .229 .203 IN .152 .127

Any thoughts would be appreciated.

Last edited by Stubbz; 11-14-2012 at 11:25 AM.
Stubbz is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 11-14-2012, 11:43 AM
Laugh now, cry later
 
Thecca's Avatar
 
Join Date: Feb 2012
Location: La Belle Province
Posts: 1,025
Bike: 03 R6, 04 Z1000
Re: Valve Adjustment Experience

Manuals says around 26k miles for a valve check. Many claims that the motor can run 50k+ without a single valve being off specs.

Strange thins is, they don't loosen with wear, they tighten... So it's pretty weird to have these numbers at only 10k... Are you the first owner?

Current bike : Z1000
Shortened oem slip-on, K&N filter and PC3, rizoma levers, sprocket kit

Old bike : YZF-R6
MJS shorty slip-on, K&N filter



Quote:
Originally Posted by Aj-Agwa View Post
why when i put the straight pipe on a i rev it to like 5 or greater RPM the bike turns off??
Dafuq?
Thecca is offline  
post #3 of 13 (permalink) Old 11-14-2012, 12:32 PM
clit commander
 
cheefar6's Avatar
 
Join Date: May 2010
Location: Polska
Posts: 1,885
Bike: 2008 YZF-R6
Re: Valve Adjustment Experience

you say the bike is 'showroom clean'.. imho that just means someone took the time to make it look good.

do you know for sure the bike was not raced/tracked from its first mili on the odo?

It is odd that you would have so many tight valves, and quite a bit out.
When i checked it on my old 03 it had almost 30k on it, with a few trackdays, and not 1 was OT.

It sounds like you did check them correctly, but if you still have it apart, have another go at it to be sure, then just replace what needs replacing and pat yourself on the back from preventing some damage.

cheefar6 is offline  
post #4 of 13 (permalink) Old 11-14-2012, 12:44 PM Thread Starter
Just made this great wheelie.. did you see it?!
 
Stubbz's Avatar
 
Join Date: Dec 2008
Posts: 62
Re: Valve Adjustment Experience

thanks guys, i am going to double check it this afternoon again to be sure but nearly 100% i did it all right, thats what struck me as odd is everyone says the valves are usually good at those 25-30k intervals and at 10 mines not.

this is like my 15th bike so i know what im lookin for when buying bikes and theres noway this has 2 or 3 times the mileage on it im very sure of that. i worked for a yamaha dealer for some time and have seen bikes in the showroom not as clean as this one is, not to say it couldnt have been riden very hard or high rpms without up shifting so idk what could have caused it but im gonna go ahead and double check then get them adjusted to fall in the middle of that spec range. this is my second 05 R6 first one had 1800 miles on it when i bought it in 06 and this bike rides tighter all around with 8800 miles on it then when i got it. i've owned this one from 8800-10400

Last edited by Stubbz; 11-14-2012 at 12:47 PM.
Stubbz is offline  
post #5 of 13 (permalink) Old 11-14-2012, 12:46 PM
pin it to win it
 
bryan j's Avatar
 
Join Date: Oct 2010
Location: forsyth GA
Posts: 8,010
Bike: 07 r6, 06 yz250f
Send a message via AIM to bryan j
Odd Ryan just changed his around 10k BC they were out of spec. I did mine at 25k miles and they were quit a bit to tight.


why do they get tighter? Spring loosening up?

Go fast parts:
Pipercross race filter, Leo sbk slip on, 05 header mod, pcv, bauce racing ecu flash, agg smog block offs, quick turn throttle, 520 rk gxw chain -1-1 renthal sprockets, ebc hh pads
, Shorai battery.

Body:
Robby moto sbk rearsets, woodcraft clip ons & sliders, armor bodies sbk fairings, db screen, vortex v3 gas cap, keyless ignition mod, agg sbk res kit,


Support the forum Vendors
bryan j is offline  
post #6 of 13 (permalink) Old 11-14-2012, 03:15 PM
Suk it, Lee
 
Ryan5544's Avatar
 
Join Date: Jul 2010
Posts: 19,063
Re: Valve Adjustment Experience

Far as I can figure, no 2 engines are identical..

Sometimes, shit just happens..

Don't know if I'd be real hung up on how many miles it has, or it should be good until x amount of miles.
Ryan5544 is offline  
post #7 of 13 (permalink) Old 11-14-2012, 03:22 PM
"The Dude abides .. "
 
MELK-MAN's Avatar
 
Join Date: Jun 2006
Location: tampa
Posts: 4,519
Bike: 2008 yamaha R6 - 2 bikes
Re: Valve Adjustment Experience

Quote:
Originally Posted by bryan j View Post
Odd Ryan just changed his around 10k BC they were out of spec. I did mine at 25k miles and they were quit a bit to tight.


why do they get tighter? Spring loosening up?
valve clearance gets smaller between the bucket and camshaft, because the valve stem comes UP as a valve wears.. have to picture in your mind the head with the valve train. A valve face wears, it flattens and mushrooms a bit, so the valve moves UP into the valve seat of the cylinder head. As a result, the distance between the bucket on top of the spring/retainers/keepers, move up toward the camshaft lobe.
Run em long enough, and there will be ZERO clearance, and you don't get the valve even sealing against the cylinder head valve seat.. loss of compression, hard starting, etc. because the valve is held OPEN a tiny amount.

no way should a 10k bike have tight valves.. but then how does a bike that is 7 years old (nearly 8) only have 10k on it?
and MY question is why is the motor out??

MICHELIN, EBC, Proflow Technologies
Silkolene, JenningsGP, Engine Ice, Sharkskinz, Pit-Bull


Greg Melka - CCS roadracing and FTR harescrambles
www.facebook.com/greg.melka.1
My racin n' ridin youtube vids http://www.youtube.com/user/gregmelka?feature=mhee

Last edited by MELK-MAN; 11-14-2012 at 03:24 PM.
MELK-MAN is offline  
post #8 of 13 (permalink) Old 11-14-2012, 03:46 PM
pin it to win it
 
bryan j's Avatar
 
Join Date: Oct 2010
Location: forsyth GA
Posts: 8,010
Bike: 07 r6, 06 yz250f
Send a message via AIM to bryan j
Quote:
Originally Posted by MELK-MAN View Post
valve clearance gets smaller between the bucket and camshaft, because the valve stem comes UP as a valve wears.. have to picture in your mind the head with the valve train. A valve face wears, it flattens and mushrooms a bit, so the valve moves UP into the valve seat of the cylinder head. As a result, the distance between the bucket on top of the spring/retainers/keepers, move up toward the camshaft lobe.
Run em long enough, and there will be ZERO clearance, and you don't get the valve even sealing against the cylinder head valve seat.. loss of compression, hard starting, etc. because the valve is held OPEN a tiny amount.

no way should a 10k bike have tight valves.. but then how does a bike that is 7 years old (nearly 8) only have 10k on it?
and MY question is why is the motor out??
Got ya makes sense

Go fast parts:
Pipercross race filter, Leo sbk slip on, 05 header mod, pcv, bauce racing ecu flash, agg smog block offs, quick turn throttle, 520 rk gxw chain -1-1 renthal sprockets, ebc hh pads
, Shorai battery.

Body:
Robby moto sbk rearsets, woodcraft clip ons & sliders, armor bodies sbk fairings, db screen, vortex v3 gas cap, keyless ignition mod, agg sbk res kit,


Support the forum Vendors
bryan j is offline  
post #9 of 13 (permalink) Old 11-14-2012, 04:11 PM
"The Dude abides .. "
 
MELK-MAN's Avatar
 
Join Date: Jun 2006
Location: tampa
Posts: 4,519
Bike: 2008 yamaha R6 - 2 bikes
Re: Valve Adjustment Experience

.. and the problem with lots of hours on valve springs, and the reason you replace valve springs (especially in race motors) is the risk of valve float at high rpm. There is a minimum spec length for springs indicated in the manaual, but if you are spending $60+ per valve to rebuild an engine, it's silly to not spend $9 or so per spring as well. If a spring wears, at high rpm, it may not pull the valve up as fast as it should. The piston is on it's way up and if the valve is a tad late in getting back to the head seat they make contact.. bad. not good. One time when you really need good springs is if you mistakenly downshift when you should go up, or down shift too many gears too fast and dump the clutch. There is NO rev limiter for overrev by way of downshifts.. if the slipper clutch doesn't slip enough, you could theoretically have an engine go beyond 16,000rpm. that is one surefire way to end up with broken valves and and expensive rebuild on a "to do" list.

MICHELIN, EBC, Proflow Technologies
Silkolene, JenningsGP, Engine Ice, Sharkskinz, Pit-Bull


Greg Melka - CCS roadracing and FTR harescrambles
www.facebook.com/greg.melka.1
My racin n' ridin youtube vids http://www.youtube.com/user/gregmelka?feature=mhee
MELK-MAN is offline  
post #10 of 13 (permalink) Old 11-15-2012, 05:22 AM Thread Starter
Just made this great wheelie.. did you see it?!
 
Stubbz's Avatar
 
Join Date: Dec 2008
Posts: 62
Re: Valve Adjustment Experience

Quote:
Originally Posted by MELK-MAN View Post
valve clearance gets smaller between the bucket and camshaft, because the valve stem comes UP as a valve wears.. have to picture in your mind the head with the valve train. A valve face wears, it flattens and mushrooms a bit, so the valve moves UP into the valve seat of the cylinder head. As a result, the distance between the bucket on top of the spring/retainers/keepers, move up toward the camshaft lobe.
Run em long enough, and there will be ZERO clearance, and you don't get the valve even sealing against the cylinder head valve seat.. loss of compression, hard starting, etc. because the valve is held OPEN a tiny amount.

no way should a 10k bike have tight valves.. but then how does a bike that is 7 years old (nearly 8) only have 10k on it?
and MY question is why is the motor out??
if you saw the bike i think youd believe its only got 10k but one of those things ya never know, i see bikes around here all the time with well under 10k miles that are 5-10 years old, i live in NY and we dont ride from October to April or so. Motor is out of the bike because im having the entire frame subframe swingarm rims and etc all powdercoated thats all, bike is absolutely mint in every way shape or form, its my second 05 R6, first one had 1800 miles on it and this bike feels just as tight overall, who knows maybe i got a fluke tighter engine but glad im getting in to do it now instead of waiting another 10k.
Stubbz is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Yamaha R6 Forum: YZF-R6 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Valve Adjustment Patroclus Garage / Mechanical Help 4 06-04-2011 10:05 PM
Valve adjustment 06 Paxter How To's... 2 05-08-2011 06:12 AM
When to do valve adjustment Dr.Manhattan Garage / Mechanical Help 7 07-24-2009 01:06 PM
How Can You Tell If You Need Valve Shims When Doing A Valve Adjustment? blk600cc General Discussions 12 05-10-2009 10:20 PM
yzf valve adjustment flynlow3 How To's... 1 07-31-2006 08:01 PM

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