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skyler.robbins
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VBMWMO #9513
Joined: 09/22/2018
Posts: 51

What's the maximum amount of time to run your bike without the valve covers on?
After my valve rebuilds/install, is it okay to run the bike for a couple minutes?
This is after installing everything and oiling up the rockers and such.
I was kinda hoping I could start the bike and look at stuff with the valve covers off.

Or is it a better idea to button things up, let the bike run for awhile and then take the valve covers off and observe?

Also,
Having the rockers in my hand, are they suppose to rotate around 360 degrees smoothly?
I've cleaned them up and squirted oil in all places, but only two of them rotate 360 degrees.
The other two feel smooth when wiggling them, but they don't rotate completely.

Thanks gang!
Rob

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6737
You can run without the valve

You can run without the valve covers on...it's just going to get messy. In general, not a good idea to run the bike for a long period of time without air moving across the cylinders. A few minutes is OK in my book, but longer than that, I'd be using some box fans to get some air moving.

Not sure I understand about the rocker arms...they don't rotate completely around, 360 degrees. When the pushrod is driven out by the cam, then it pushes on the arm on the rocker which then actuates the specific valve. They don't really move all that far when actuated. But they don't rotate 360 degrees.

Rotating around in your hands? There are bearings in the ends of the rocker arm so they should move easily over a small rotational range.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

wa1nca
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Ashfield Ma.
Joined: 09/27/2012
Posts: 492
Rocker arm rotation

As long as they move freely when needed its ok
If you back off the valve adjustment bolt all the way and the rocker moves freely to the valve stem and back it should be ok

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

skyler.robbins
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Joined: 09/22/2018
Posts: 51
Looking good..

Okay thanks guys...
It was kinda hard to explain, but my rockers are out of the bike cause I'm getting the exhaust thread repaired.
I know they don't spin 360 when installed, but when I have them in my actual hand, I was spinning them around and around while holding the ends.
I'm probably just asking weird questions since this is my first top end removal/rebuild/assembly.

I had a BMW machinist look at them today... the rockers are good.
He took my valves out of the heads and so far he feels that I need a new intake valve on one head.
He noticed that the keeper for that valve was not correct.
He's going to install new intake valve guides. He actually makes them on a lathe.
As he gets into the nitty gritty, he'll let me know exactly what I need. This was just a quick assessment.

Man.. I learned a lot in just that one hour!
This fellow has to be in his 80's and has been working on BMW's and other machinery for almost 50 years.
He has probably 4 or 5 sets of heads there for repair.

Thanks again for the help/info... I'm sure I'll have more questions once I get my heads back!

Rob

wa1nca
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VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 492
Recondiontion Head

Rob
Sounds like the person that have done 3 of my bikes cylinder heads
He also makes the valve quides himself and does thread repairs the proper way

Is his name Paul Surgis and works out of his home in Oregon state

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

skyler.robbins
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Joined: 09/22/2018
Posts: 51
That's him Tommy! Super nice

That's him Tommy!
Super nice older fella!
This guy knows his stuff.. completely feel good about having him do the work

wa1nca
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VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 492
Paul Sturgis

Didn't know he was still rebuilding heads
Glad to here he still is doing what he does best
Yes a very nice person to work with
Excellent work and very reasonable prices

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

Daves79x
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VBMWMO #9030
Joined: 08/09/2015
Posts: 340
The Rockers

The rockers should spin freely on the shafts 360 degrees out of the bike and holding them in your hand. If they don't, there is some crud built up inside the rocker and/or shaft. You should disassemble them all, and clean everything. They will rotate smoothly then. You will have to adjust end float anyway, so go ahead and take them apart.

Dave

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Dave

skyler.robbins
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VBMWMO #9513
Joined: 09/22/2018
Posts: 51
Got them spining free now...

Daves79x wrote:

The rockers should spin freely on the shafts 360 degrees out of the bike and holding them in your hand. If they don't, there is some crud built up inside the rocker and/or shaft. You should disassemble them all, and clean everything. They will rotate smoothly then. You will have to adjust end float anyway, so go ahead and take them apart.

Dave

Thanks Dave!

Daves79x
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Joined: 08/09/2015
Posts: 340
I Should Add

I should add that if your bike in an R69 or R69S, it has needle bearings in the rocker pivots. Don't lose any of them. They are a bit fiddly to get back together, but not too bad. The R50-R60 just has bushings and you won't have any trouble with that.

Dave

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Dave

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