919 valve shim size question - Wrist Twisters
 
Thread Tools Display Modes
post #1 of 20 Old 03-04-2013, 06:06 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
Does anyone know the stock valve shim sizes for the intake and exhaust valves? First inspection and I need to shim at least one valve cylinder 4 exhaust side. It was the only one out of tolerance and I haven't pulled the cam yet. I was going to pick up the correct shim on the way home tomorrow.

redline919 is offline  
Sponsored Links
Advertisement
 
post #2 of 20 Old 03-04-2013, 06:36 PM
Tirone Choolaces
 
marylandmike's Avatar
 
Join Date: Aug 2007
Location: USA
Posts: 11,120
Rep Power: 1
 
Garage

Awards Showcase
Wrist Twisters Event Attendance Donation Donation 
Total Awards: 3

Not sure there is a stock size. The manual tells you to measure the the one that you take out and then adjust the size based on the measured vs desired clearance. There's a formula in the manual.


marylandmike is offline  
post #3 of 20 Old 03-04-2013, 06:38 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
there is no "default size" (assuming you mean thickness) as they are all speced properly when the motor is built due to the very slight differences in tolerance.

Only thing you can do is take down your lash measurements, remove the respective shims, measure them, do the math to get the new desired shim thickness that will put you back in spec.

Question. how far from spec are the valves in question? Reason i ask is im pretty sure its + - .03mm from spec on both intake and exhaust

nd4spdbh is offline  
 
post #4 of 20 Old 03-04-2013, 06:42 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
Ok I thought maybe they might be the same on all motors from the factory. The valve in question was .008 and it supposed to be .010 +/- .001 so it needs shimmed. Thanks for the help

redline919 is offline  
post #5 of 20 Old 03-04-2013, 06:52 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
assuming exhaust given the .01 spec.

i always use the metric spec as its a little more accurate.... so .25mm + - .03mm

so on the tight side of the spec you have .22mm = .00866in

Now question, did the .008 feeler gauge fit, and the .009 did not? if so your gap is bigger than .008 (typically you take the difference between the two feelers for actual gap... so in this case .0085in)... and in all honesty i would not go through the WHOLE process of removing a cam to adjust a valve thats .00016in too tight.... thats so miniscule, and the time and risk of messing up stuff (a messed up cam aint cheap) is not worth it.


That stated, watch it, if its getting tighter than what its at i would shim it.

EDIT- Second question, how many miles on the bike?

nd4spdbh is offline  
post #6 of 20 Old 03-04-2013, 06:58 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
That is correct the .008 fit and the .009 did not. I know its close but is a lil tighter than it should be. The other valve on that cylinder fit the .010 kinda weird

redline919 is offline  
post #7 of 20 Old 03-04-2013, 06:58 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
Just a lil over 17k on the odometer

redline919 is offline  
post #8 of 20 Old 03-04-2013, 07:04 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
Quote:
Originally Posted by redline919 View Post
That is correct the .008 fit and the .009 did not. I know its close but is a lil tighter than it should be. The other valve on that cylinder fit the .010 kinda weird
Quote:
Originally Posted by redline919 View Post
Just a lil over 17k on the odometer

Yeah honestly i would not worry about it. unless it was something like .02mm outside the tight end of the spec (so .20mm or .0078 - IE .008 feeler not fitting but .007 fitting) thats when i would go through the entire process.

At the mileage you are at i would ride till 30k then check again.

But someone correct me if i am wrong... it is an exhaust and typically we like to see them on the looser side, but one valve SO close to spec i dont think is cause for complete cam removal IMO.

nd4spdbh is offline  
post #9 of 20 Old 03-04-2013, 07:12 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
Ok I will give it some thought. It just seems like I could avoid damage if I just fix it now while its apart. Im on the wall also. It's close. Dunno.. Thanks again.

redline919 is offline  
post #10 of 20 Old 03-04-2013, 07:33 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
maybe get LDH and Rob a motion to come join this thread and see what they say about it.

nd4spdbh is offline  
post #11 of 20 Old 03-05-2013, 02:22 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
Ok I pulled the cam. I did the formula and came up with 1.849 for the new shim. So it looks like I need a 185 shim correct me if I am wrong please.

redline919 is offline  
post #12 of 20 Old 03-05-2013, 04:50 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
Quote:
Originally Posted by redline919 View Post
Ok I pulled the cam. I did the formula and came up with 1.849 for the new shim. So it looks like I need a 185 shim correct me if I am wrong please.
that would be correct. Shims go in .05mm sizes a 185 shim is 1.85mm

what was the original shim size? (probably 180?)

nd4spdbh is offline  
post #13 of 20 Old 03-05-2013, 05:01 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
It was 190. The manual states the shims go in intervals of .025mm. So I guess the smaller shim increases valve clearance.

redline919 is offline  
post #14 of 20 Old 03-05-2013, 05:52 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
Quote:
Originally Posted by redline919 View Post
It was 190. The manual states the shims go in intervals of .025mm. So I guess the smaller shim increases valve clearance.
im sorry i had it backwards i forgot you were on the tight side of things (as opposed to the valves i just adjusted on my dirbike that were loose). so yes a 190 originally to a 185 would be the proper way to go. That will loosen you up.

I dont think i have seen any shim kit go in .025mm increments.

nd4spdbh is offline  
post #15 of 20 Old 03-05-2013, 05:55 PM Thread Starter
Princeps Prior
 
redline919's Avatar
 
Join Date: May 2012
Location: Cincinnati
Posts: 1,894
Rep Power: 1
 
Right on. I'm gonna stop by my local Honda stealership tomorrow and see if they have it. Thanks again

redline919 is offline  
post #16 of 20 Old 03-05-2013, 06:34 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
Quote:
Originally Posted by redline919 View Post
Right on. I'm gonna stop by my local Honda stealership tomorrow and see if they have it. Thanks again
i would find a local shop rather than a dealership... they will often just trade shims as the shims themselves dont wear and they would rather not loose stock of a shim. Otherwise the dealer is gonna cost you an arm n a leg for a tiny piece o metal.

nd4spdbh is offline  
post #17 of 20 Old 03-05-2013, 07:15 PM
McTavish
 
mcromo44's Avatar
 
Join Date: Oct 2007
Location: Calgary
Posts: 5,528
Rep Power: 1
 
Quote:
Originally Posted by nd4spdbh View Post
im sorry i had it backwards i forgot you were on the tight side of things (as opposed to the valves i just adjusted on my dirbike that were loose). so yes a 190 originally to a 185 would be the proper way to go. That will loosen you up.

I dont think i have seen any shim kit go in .025mm increments.
Factory kits yes, Aftermarket no, so I've been told plus the manual shows increments in .025s
And 0.025s = 1 thou increments

mcromo44 is offline  
post #18 of 20 Old 03-05-2013, 07:29 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
Quote:
Originally Posted by mcromo44 View Post
Factory kits yes, Aftermarket no, so I've been told plus the manual shows increments in .025s
And 0.025s = 1 thou increments

dont think i have ever seen a 4 digit factory shim though.... IE 1875 or 1.875mm

nd4spdbh is offline  
post #19 of 20 Old 03-05-2013, 08:44 PM
McTavish
 
mcromo44's Avatar
 
Join Date: Oct 2007
Location: Calgary
Posts: 5,528
Rep Power: 1
 
Smile

Quote:
Originally Posted by nd4spdbh View Post
dont think i have ever seen a 4 digit factory shim though.... IE 1875 or 1.875mm
Hmmm, this is either a good gimmee for me, OR you are skillfully testing.
The manual shows a 3 digit numbering system for 4 digit dimensions.
180 = 1.80
182 =1.825
185 = 1.850
188 = 1.875
page 3-11

mcromo44 is offline  
post #20 of 20 Old 03-05-2013, 11:28 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
oh yes you would be right. good luck finding em!

nd4spdbh is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Wrist Twisters 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 Off
Pingbacks are Off
Refbacks are Off

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