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Old 05-25-2011, 11:10 AM   #556
DoktorT
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Quote:
Originally Posted by jbeem View Post
When the GS is on the centerstand and in gear, how much radial movement is "normal" if I try to spin the rear wheel?
A couple inches at the tire perimeter is normal. The gear mesh of the ring and pinion need a bit of slack, otherwise heat expansion could lead to excess wear and binding.

Spline wear can add a bunch. Expand a mm of spline wear to the tire perimeter and you got an extra 10mm slack.
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Old 05-26-2011, 01:13 AM   #557
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ATE Caliper pistons..

G'day.

I'm chasing a set of 38mm ATE caliper pistons (2x).

I already have the seals..

Motobins have some at 78 pounds each.

These are not Stainless.

Anyone know of any substitutes, or other sources?


Thanks

OZ.
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Old 05-28-2011, 12:53 AM   #558
bmweuro
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Quote:
Originally Posted by oz_airhead View Post
G'day.

I'm chasing a set of 38mm ATE caliper pistons (2x).

I already have the seals..

Motobins have some at 78 pounds each.

These are not Stainless.

Anyone know of any substitutes, or other sources?


Thanks

OZ.
I haven't found any aftermarket on these. You might try your BMW dealer.
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Old 05-28-2011, 08:41 AM   #559
boxerboy81
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Quote:
Originally Posted by oz_airhead View Post
G'day.

I'm chasing a set of 38mm ATE caliper pistons (2x).

I already have the seals..

Motobins have some at 78 pounds each.

These are not Stainless.

Anyone know of any substitutes, or other sources?


Thanks

OZ.

Where are you? Most Oz cities have someone with stuff. pm me.
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Old 05-29-2011, 09:08 PM   #560
pthomas
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Quote:
Originally Posted by oz_airhead View Post
G'day.

I'm chasing a set of 38mm ATE caliper pistons (2x).

I already have the seals..

Motobins have some at 78 pounds each.

These are not Stainless.

Anyone know of any substitutes, or other sources?


Thanks

OZ.
Where did you source the seals? I need the seals but I have the caliper; I looked at Max BMW and it looks like it's only sold as a kit.
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Old 05-29-2011, 09:46 PM   #561
oz_airhead
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Quote:
Originally Posted by pthomas View Post
Where did you source the seals? I need the seals but I have the caliper; I looked at Max BMW and it looks like it's only sold as a kit.
G'day Paul.

Motobins in the UK.

http://www.motobins.co.uk/

They sell either seals AND piston or just the seals only. In either the 38mm or 40mm size.

Also motoworks in the UK as well.

You could also try Ted Porter in California

www.beemershop.com

HTH

OZ
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Old 05-30-2011, 02:25 PM   #562
DoktorT
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Quote:
Originally Posted by oz_airhead View Post
G'day Paul.

You could also try Ted Porter in California

www.beemershop.com

HTH

OZ
+1 for Ted Porter. Super source for Airhead knowledge and parts. Above and beyond customer service. If he went public, I might buy stock.
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Old 05-30-2011, 04:28 PM   #563
pthomas
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Quote:
Originally Posted by oz_airhead View Post
G'day Paul.

Motobins in the UK.

http://www.motobins.co.uk/

They sell either seals AND piston or just the seals only. In either the 38mm or 40mm size.

Also motoworks in the UK as well.

You could also try Ted Porter in California

www.beemershop.com

HTH

OZ
Thanks. Amazing to see that the seals are cheaper when I import them from the UK, even after shipping, that buying them in the US. We're truly a global in this day and age.
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Old 05-30-2011, 05:26 PM   #564
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There was someone on the net selling SS caliper pistons 0n Ebay and one of our inmates tried using a set.
If I remember correctly, the outcome was not good.
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Old 05-31-2011, 04:40 AM   #565
oz_airhead
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Quote:
Originally Posted by wirewrkr View Post
There was someone on the net selling SS caliper pistons 0n Ebay and one of our inmates tried using a set.
If I remember correctly, the outcome was not good.

Yep I saw that. They were 40mm if I recall from ebay,

You'd reckon someone would turn up a few and sell them in stainless.

These bikes are getting on with ATE swinging calipers - was '79 the last of them? And you'd have to agree that the majority have some sort of corrosion due the age of the dust seals that finally give up the ghost.

That means either cleaning them up as a bandaid, or replacing with OEM.

Cheers & thanks.

OZ
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Old 06-01-2011, 06:32 PM   #566
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1980 were the last models (in the US ) to have these goofy things.
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Old 06-11-2011, 07:10 PM   #567
DoktorT
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Originally Posted by bmweuro View Post
I haven't found any aftermarket on these. You might try your BMW dealer.
I worked on Euros for many years, 90's and back. I've seen hundreds certainly of all the common BMW/Mercedes/vwporshceaudi/volvo models with Ate calipers. I never did measure the seals/pucks. Just put in the OEM kit. Amongs those are certainly common examples of 38 and 40mm seals and pucks.

Seems if you could identify which yrs/model used those sizes, sourcing those might just work ding dang dandy for the early Airheads, including boots.

If it's a dual puck kit, it would do both Airhead calipers for the S/RS/RT.

None of the parts lists I have researched on this give the size, just the application.
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Old 07-15-2011, 02:05 PM   #568
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Valve Cover Stud Removal from Head ? ? ?

Greetings folks...I tried a search of this topic but didn't come up with the info I need, so...

What's the best way to remove the center stud from a cylinder head?

I'm switching out a bad left head (stuck intake valve) with a used head. The used one didn't come with the central threaded stud that secures the valve cover.

I already put PB blaster penetrating oil on it...have not tried anything else. Am I going to need heat, etc. what's the best way to get a solid grip on the 'lil bugger so I can back it out?

If there's anything else I should watch out for when reinstalling the head...feel free to elaborate

Thanks in advance for your input!

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Old 07-15-2011, 05:32 PM   #569
Zebedee
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Quote:
Originally Posted by Claytonroy View Post
...

Am I going to need heat, etc. what's the best way to get a solid grip on the 'lil bugger so I can back it out?

...
It might need to be warmed up a bit if the stud is in with some flavour of Loctite, but asking the obvious first, have you tried using two nuts in the thread to form a lock nut.

You know the trick, tighten one nut against the other and then just wind the stud out using the lower nut ...



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Old 07-16-2011, 08:49 AM   #570
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Heat certainly won't hurt - I'd go to just spit-sizzle hot but not much more. (I can't spit accurately so I flick water drops from my finger or small drops from a baby nose syringe).

I've had marginally better success on some stubborn Ducati studs using one of the common cam type stud pullers instead of the doubled nuts which work well much of the time. Can't remember where I got the stud puller, probably an auto parts store. They are round gizmos about 2" in diameter with an offset hole and a smaller internal cam. A 3/8 ratchet handle locks the cam onto the stud as you apply force to make it self-tightening. But like I said, mine is only marginally better than the two nuts.
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