ADVrider

Go Back   ADVrider > Bikes > Old's Cool > Airheads
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-27-2015, 04:26 PM   #1
BarryT OP
Studly Adventurer
 
Joined: Jul 2009
Location: Edwards AFB California (Rosamond CA)
Oddometer: 558
Buying a used Airhead anyway to check valve recession

You guys might have seen my post on my soon to be new project. Its an 1981 R100. It was made right at the beginning of the valve seat issues. It has 44,000 original miles, but no history and was running when parked a decade ago. Is there anyway to statically tell its having recession issues? Or is the only way to track how much the valve are tightening up over a period of time?


Thanks,
Barry
__________________
2006 Buell Ulysses

BarryT screwed with this post 01-27-2015 at 04:44 PM
BarryT is offline   Reply With Quote
Old 01-27-2015, 04:45 PM   #2
airsmith
airhead wrench?
 
Joined: Jun 2013
Location: raleigh nc
Oddometer: 149
valves can be checked, not seats, pull plugs and rotate the engine using the rear wheel(center stand, bumping the wheel by hand, 4 or 5th gear..) look down the plug hole and you will see the edge of a valve as its gets to its fully open position.. the ex-valve will be the showing any degradation..instead of having a square edge it will start to look like a knife edge..
__________________
LOUD PAINT SAVES LIVES
airsmith is offline   Reply With Quote
Old 01-28-2015, 12:01 PM   #3
Mark Manley
On my way
 
Mark Manley's Avatar
 
Joined: Apr 2010
Location: Back home in the UK
Oddometer: 676
I think it will all depend on how the bike has been ridden, long high speed runs seem to increase valve and seat wear and certainly on my '83 G/S the steady use I put it to has kept wear down to a minimum. I would suggest riding it and see how thing go, if you get valves closing or have poor performance take a look inside, if not leave it alone.
__________________
If it's in the Touratech catalogue then you don't need it

"You've got to think for yourselves! You're all individuals!"-Brian of Nazareth
Mark Manley is offline   Reply With Quote
Old 01-28-2015, 12:29 PM   #4
Renner
infamous wrench
 
Renner's Avatar
 
Joined: Jul 2007
Location: sunny SoCal
Oddometer: 2,177
As I understand it, prolonged valve and valve seat issues can be noticed at the rocker's valve lash adjusters, which are progressively backed-out to accomodate the deformation.

The exhaust side is more susceptible, so compare that with the intake rocker lash adjustment.
__________________
"If you want to fix it with a rock, you have to stick to stone-age technology" -Anton
"...solving the latest crisis that is preventing my Airhead from taking me to the bar." -Beater-

Renner screwed with this post 01-28-2015 at 12:41 PM
Renner is offline   Reply With Quote
Old 01-28-2015, 02:17 PM   #5
disston
ShadeTreeExpert
 
disston's Avatar
 
Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 9,195
There's an echo in here.
__________________
.
Never memorize something you can look up.
---Albert Einstein

Pay your debt, piratejohn.http://www.advrider.com/forums/showthread.php?t=949341
disston is online now   Reply With Quote
Old 01-28-2015, 07:08 PM   #6
crazydrummerdude
Wacky Bongo Boy
 
crazydrummerdude's Avatar
 
Joined: Nov 2006
Location: St Louis, MO
Oddometer: 7,603
Well, if your rocker adjustment looks like this:



Your valve/seat will look like this:

__________________

crazydrummerdude is offline   Reply With Quote
Old 01-28-2015, 07:17 PM   #7
Renner
infamous wrench
 
Renner's Avatar
 
Joined: Jul 2007
Location: sunny SoCal
Oddometer: 2,177
that's it!





oh my...
__________________
"If you want to fix it with a rock, you have to stick to stone-age technology" -Anton
"...solving the latest crisis that is preventing my Airhead from taking me to the bar." -Beater-
Renner is offline   Reply With Quote
Old 01-29-2015, 12:02 AM   #8
BarryT OP
Studly Adventurer
 
Joined: Jul 2009
Location: Edwards AFB California (Rosamond CA)
Oddometer: 558
I appreciate every ones input. My last airhead was a 77 75/7 and I used the correct fuel and never worried. This 1981 100/7 has me paranoid about getting it home and finding out I need head work right away. Since its been sitting for a decade I can't do any running tests.

I will pull the covers and look at the adjusters. If there is anything funky the seller and I will have to re-negotiate.

Again thanks guys!
Barry


Lastly Renner where are you in SoCal?
__________________
2006 Buell Ulysses
BarryT is offline   Reply With Quote
Old 01-29-2015, 11:08 PM   #9
BarryT OP
Studly Adventurer
 
Joined: Jul 2009
Location: Edwards AFB California (Rosamond CA)
Oddometer: 558
The intake and exhaust vavles looked like the adjuster on the right, The bike was ugly on the outside but the fluids and what I could see of the internals looked like they were in amazing shape. There will be a post with pics soon!





Quote:
Originally Posted by Renner View Post
that's it!





oh my...
__________________
2006 Buell Ulysses
BarryT is offline   Reply With Quote
Old 01-29-2015, 11:21 PM   #10
disston
ShadeTreeExpert
 
disston's Avatar
 
Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 9,195
Quote:
Originally Posted by BarryT View Post
The intake and exhaust vavles looked like the adjuster on the right, The bike was ugly on the outside but the fluids and what I could see of the internals looked like they were in amazing shape. There will be a post with pics soon!
Old trick maybe? Want to sell an old vehicle with poor maintenance? Change the oil.
__________________
.
Never memorize something you can look up.
---Albert Einstein

Pay your debt, piratejohn.http://www.advrider.com/forums/showthread.php?t=949341
disston is online now   Reply With Quote
Old 01-29-2015, 11:24 PM   #11
BarryT OP
Studly Adventurer
 
Joined: Jul 2009
Location: Edwards AFB California (Rosamond CA)
Oddometer: 558
I don't think so. Seemed legit. The seller was very open and honest. I'm pretty sure its in good shape, but we will see lol. I might of got hoodwinked. I'm still in Arizona where I picked up the bike. I won't have it back in my garage in Cali until Saturday.
__________________
2006 Buell Ulysses
BarryT is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not 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 On

Forum Jump


Times are GMT -7.   It's 03:54 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014