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Old 08-21-2009, 12:54 AM   #1
zoo mob OP
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Walk me through an Airhead valve adjustment.

I'm trying to sort out all of the basic maintenance issues that need attention with my new '87 R80rt. Next on the list is a valve adjustment. I've looked at the Clymer, but its pretty confusing, my only experience with valve adjustment comes from Honda SOHC 4's which are set up quite a bit differently. Is there a how-to somewhere online, or could someone do a super quick write up on it? Thanks a million.
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Old 08-21-2009, 01:34 AM   #2
PaulRS
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In short.

-Remove both valve covers and sparkplugs.
-Remove black rubber plug from the inspection hole on the left of the engine, next to the oil dipstick.
-Turn the engine over by hand until 'OT' (tdc) shows in the hole.
-One cylinder will be at the end of compression stroke with both valves closed and ready to be adjusted.
-The other cylinder is then at the end of the exhaust stroke with both valves slightly open, to adjust this side, rotate the cranck one full turn.

Quick enough?

Paul.
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Old 08-21-2009, 04:56 AM   #3
datchew
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fill out your user profile. Some of the gang are probably very close to you.

It's not difficult, but it can be a whole lot easier to have another airhead swing by and talk you through several things.
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Old 08-21-2009, 05:33 AM   #4
hank0614
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Quote:
Originally Posted by zoo mob
I'm trying to sort out all of the basic maintenance issues that need attention with my new '87 R80rt. Next on the list is a valve adjustment. I've looked at the Clymer, but its pretty confusing, my only experience with valve adjustment comes from Honda SOHC 4's which are set up quite a bit differently. Is there a how-to somewhere online, or could someone do a super quick write up on it? Thanks a million.
Try this link. It applies to /5's and earlier airheads but is valid for later bikes as well. Your valve spec's may vary, check the manual, but the technique is applicable to all air cooled beamers. It is very thorough and Duane is always clear in his explanations.

http://w6rec.com/duane/bmw/
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Old 08-21-2009, 05:35 AM   #5
Renner
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"quite simple really"

almost feeling guilty doing this
(hope you enjoy reading)
http://bmwmotorcycletech.info/setvalves.htm


should be a breeze after your SOHC4 experience
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Old 08-21-2009, 05:58 AM   #6
datchew
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just one warning if you're new to airheads.

If you re-torque the heads, be SURE to use a very good torque wrench that you trust to be calibrated and stay around 25 ft-lbs or less.

You don't want to deal with a pulled cylinder stud.
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Old 08-21-2009, 06:14 AM   #7
Rob Farmer
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Don't forget the end float on the rockers while you're in there - 0.05mm

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Old 08-21-2009, 06:36 AM   #8
sharkojoints
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Quote:
Originally Posted by hank0614
Try this link. It applies to /5's and earlier airheads but is valid for later bikes as well. Your valve spec's may vary, check the manual, but the technique is applicable to all air cooled beamers. It is very thorough and Duane is always clear in his explanations.

http://w6rec.com/duane/bmw/
...and this is the specific page you're after:

http://w6rec.com/duane/bmw/valve/index.htm

Although he talks about the /5, your bike is much the same. Handy photos too. Even an idiot like me could understand it.

I find Duane a hell of a lot easier to understand than the Snowbum site. If you have the time and can cope with the headache inducing capitals and coloured highlighting then there is a lot of wisdom on Snowbum's site, but that's a pretty big 'if'.
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Old 08-21-2009, 11:47 AM   #9
Infracaninophile
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This might help

Zoo:

Click on my link below for my R100 maintenance and then zoom down to post 119-120 to start. Lots of pics and shows how I learned. Might help a bit.

Tom
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Old 08-22-2009, 11:35 AM   #10
crazydrummerdude
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Quote:
Originally Posted by Rob Farmer
Don't forget the end float on the rockers while you're in there
How do you adjust that, though? Another washer spacer deal?

EDIT: Oh, never seen this page on Duane's site:

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Old 08-22-2009, 01:07 PM   #11
Rob Farmer
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Quote:
Originally Posted by crazydrummerdude
How do you adjust that, though? Another washer spacer deal?

EDIT: Oh, never seen this page on Duane's site:


WTF!!
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Old 08-22-2009, 03:55 PM   #12
datchew
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Duane's site has a whole lot of neat information, but bear in mind that it's not always correct.

Not knocking the guy, he's been around a long time and is a great reference for some old stuff and I'm grateful he has taken the trouble to put all that stuff on his site.

I just wouldn't regard information on everything with the same confidence as I would from somebody like Oak or Snowbum or Anton or Vech.
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Old 08-22-2009, 10:39 PM   #13
opposedcyljunkie
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Quote:
Originally Posted by Rob Farmer
Don't forget the end float on the rockers while you're in there - 0.05mm
Rob, are those aluminum pillow blocks? If so, do they really help in quieting down the valve train? I happen to have a set for a 70s airhead which I haven't installed. Need more inspiration from a good testimonial
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Old 08-23-2009, 10:25 AM   #14
crazydrummerdude
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Quote:
Originally Posted by Rob Farmer
WTF!!
You took the... letters.. right out of my.. fingers.
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Old 08-23-2009, 10:53 AM   #15
Chopperman
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Quote:
Originally Posted by Rob Farmer
WTF!!
So? it doesnt take much pressure to get the clearance right. you arent removing old plumbing or anything. Knowing of Duane, it was just for illustration and would just expect that someone would wrap the channel locks in tape.
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