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hooverbj
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VBMWMO #9255
Joined: 04/01/2017
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I just ordered some things from Vech for a spring tune-up on my 1966 R50/2. I wanted enough oil (Valvoline VR1) and crush washers to do several oil changes. I talked to John this time ( Its usually Richard) he also mentioned gear oil. So he sold me 2 quarts of 80W-90 GL4 Gear Oil too. I'm looking at my Clymer Manual and it recommends 0.53 US pints for the final drive and 0.21 pints for the drive shaft!
How in the Hell do I measure that?!...and the drive shaft fill hole looks like it would require a special funnel?

I would love to get some advice about measuring amounts and how to refill these reservoirs?
Thanks in advance
Brian Hoover
Cedar City, Utah
1966 R50/2
2004 R1200c

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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For the final drive, there's

For the final drive, there's really no measurement needed. Drain as usual with the bottom plug. Then open the fill hole at the 9 o'clock position and pour in the gear oil until the level is at the bottom of the threads in the hole. You might want to hand rotate the tire a few times just to be sure there's no air pockets. That should be good enough.

For the driveshaft, you will need to find something to measure the fluid. Years ago, I went to a medical supply store and bought a urine sample glass beaker...at least I think it was for urine...but whatever, it's graduated along the side. Possibly you'll find something similar in an auto parts store. The spec calls for 100cc of oil...I certainly wouldn't go beyond that...you could get by with slightly less, even 50cc. But shoot for 100. Yes, you'll need to find a small funnel...I snagged something years ago...not sure where. You'll need to pour slowly to let the air come out. But drain as normal, and then fill with 100cc-ish of gear oil.

Just did some conversions...0.21 pints is 99 milliliter (or cc). 0.53 pints is a little over 250 milliliters.

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

Twocams
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I bought a measure device for

I bought a measure device for mixing gas/oil in older off road bikes from a motorcycle shop. Also has a screw on led. About 2" in dia X 6" tall. Different measurements on plastic.

Also use a syringe for live stock ( horse/cows) 1/2" dia. 6" long plastic also has scales. Bought from a ranch supply place.
I use that yellow gas hose (see through) they sell now from a lawn mower repair shop or some bike shops. Nice and flexible on the syringe / the right size will fit the diff. hole.

twocams

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Twocams
69 R69S
92 R100RT
2004 Aprilia Atlantic 500cc single cylinder Scooter

Twocams
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Quick pic

Quick pic they also use this redish color hose.

  • dsc00010.jpg
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Twocams
69 R69S
92 R100RT
2004 Aprilia Atlantic 500cc single cylinder Scooter

miller6997
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VBMWMO #6997
Joined: 10/27/2006
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Matchstick

When I bought my first /2 fifty years ago, the tech advised me to check the driveshaft lube by putting a wooden kitchen matchstick into the fill hole until it touches the shaft. When you remove it, it should show about 1/16" of oil. If it does, you're good. If you're changing the oil, of course it makes more sense to simply measure the volume before you pour it in.

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Jon Miller
'67 R69S
'13 F800GT
Altadena, California

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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Oil Level Check

miller6997 wrote:

When I bought my first /2 fifty years ago, the tech advised me to check the driveshaft lube by putting a wooden kitchen matchstick into the fill hole until it touches the shaft. When you remove it, it should show about 1/16" of oil. If it does, you're good. If you're changing the oil, of course it makes more sense to simply measure the volume before you pour it in.

This would probably way overfill the driveshaft. Looking in my /2 Clymers, which is similar to what I saw for my /7, they say to stick something in the hole, bend around the shaft and touch the bottom of the shaft tube. The oil should be about 0.5 inches up on the measuring stick. If the picture in the Clymers is to scale, the oil would be just barely touching the bottom of the internal shaft. I'm not sure what the shaft diameter is, but again, if the scale of the picture is right, filling the shaft to the amount of oil such that it completely covers the driveshaft would result in 2 to 2.5 times too much oil in the driveshaft.

I never found this way of measuring the oil level to be very effective. If you stick something in and it touches the shaft on the way down, what's the potential that it will deposit residual oil on the measuring tool...giving an erroneous reading. Best to just drain and refill with the proper amount. Or drain, measuring what came out, and replace with that same amount of oil.

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

miller6997
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VBMWMO #6997
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Oh...

You may have exposed fifty years of folly on my part. I'll drain it and measure exactly how much is in there.

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Jon Miller
'67 R69S
'13 F800GT
Altadena, California

schrader7032
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VBMWMO #7032
San Antonio, TX
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The only real harm is the

The only real harm is the reduction of the air volume inside the shaft. If for some reason the pressure where to build it would push on the seals at the front and rear. But the reality is that there doesn't need to be that much oil in the drive shaft. As you accelerate and decelerate, the oil shifts back and forth keeping things lubed. So the spec amount or a tad less is just fine.

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

KIRIEIW
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I just did this last weekend

I just did this last weekend actually. Small tip, if the oil's filling slowly into the fill hole you can "massage" the driveshaft boot (just squeezed it a little) and it'll help get the oil into the driveshaft faster. I was lucky and found the perfect funnel in the house, it was a really small one which fit perfectly into the fill hole.

miller6997
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Following up...

This morning I checked the driveshaft oil level in my '67 R69S using the matchstick. It showed about 1/16" , maybe a tad more, on the stick. I pulled the plug let it drip for a couple of hours and found that about 190cc or a tad more, had drained out. The Barrington book (page 483) calls for 200 cc, so mine was very close and I refilled it with exactly 200cc. This time, the matchstick showed between 1/16" and 1/8".

Now here's the conundrum. As Kurt pointed out, the 1978 Clymer manual (pp. 27-8 in my copy) calls for .1 liter, or 100cc, and suggests that the level should be about 1/2" from the bottom of the housing.

These cannot both be correct. I loaned out my factory manual and can't do a triple-check, but I can say that my bike has had 200cc, give or take, for 51 years and 80,000 miles.

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Jon Miller
'67 R69S
'13 F800GT
Altadena, California

schrader7032
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VBMWMO #7032
San Antonio, TX
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All the specs I've seen are

All the specs I've seen are for 150cc or even a shade less....these are Clymers, Haynes and the like. Just looked at my copy of the BMW Workshop Manual and it says 200cc in the rear swinging arm. This service bulletin also says 200cc:

http://www.beemergarage.com/documents/254.pdf

People who have been around these bikes for a long time, eg Duane Ausherman, Snowbum, etc., all are in the 100-150cc range. If anyone calls Vech, I'd like to here what he has to say.

What may be the case is that initially it was 200cc. But over the years, after the run of /2 models, it was found out that a happy median of 100-150 worked well, a balance between lubrication needs and air volume for pressure build up.

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

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