1989 BMW R80

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bmwvh61
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Re: 1989 BMW R80

Postby bmwvh61 » Wed Jan 03, 2018 12:33 am

Hi
I replaced my hoses with braided hosing on my R65 as my old hoses were full of old fluid from years of sitting around.
Can't remember if I sourced from Venhill or one of the on line spares guys, but now have a decent front stoppers.
I have not seen a set up with both hosed coming from the calipers to the master cylinder; I'd just replace the fluid splitter.

Vince
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george baker
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Re: 1989 BMW R80

Postby george baker » Wed Jan 03, 2018 3:19 pm

Hi
you can get a double length bolt to use with separate braided hoses for each caliper, yes the hoses are custom but places are used to making them

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Re: 1989 BMW R80

Postby Karl740 » Sun Jan 07, 2018 9:30 pm

Think I’ll order custom lines from Venhill.

My bike is currently sat on its centre stand and the side stand and springs have come off somehow. The sprigs don’t have standard hooked ends but one roller on one end and two the other. I can’t figure out where and how all this was hooked up and am struggling to find pictures. Any ideas?

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Re: 1989 BMW R80

Postby george baker » Sun Jan 07, 2018 9:38 pm

Hi
try putting your vin in to realoem.com, you may find a picture of how it should be

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Re: 1989 BMW R80

Postby Karl740 » Mon Jan 15, 2018 8:41 pm

I’ve tried the site suggested and can’t find what I’m looking for. Anyone with any pictures of there side stands and how it’s fitted, including springs etc?

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Galactic Greyhound
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Re: 1989 BMW R80

Postby Galactic Greyhound » Mon Jan 15, 2018 8:52 pm

Ced.

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Re: 1989 BMW R80

Postby Karl740 » Sat Jan 20, 2018 12:20 pm

I’ve come to the conclusion I must be missing some parts as all I see to have is the spindle, kick stand and spring. No backing plate of any kind unless mine has a slightly different design.

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Re: 1989 BMW R80

Postby Galactic Greyhound » Sat Jan 20, 2018 1:24 pm

From George's post about using the RealOem Parts Fiche (www.realoem.com) here is what it shows for a 1980 BMW R80, diagram 'Frame and Mounting Parts'/'Sidestand':

http://www.realoem.com/bmw/enUS/showpar ... Id=46_0054

You will get a more accurate result if you put the last 7 digits of your VIN into the 'Serial No.' box and click on 'Search':

http://www.realoem.com/bmw/enUS/select

Note the lug on the LH side front of the Main Frame which the clevis of the Sidestand fits into and is secured by the pivot bolt.

The lug is welded to the front of the LH Main Frame lower frame tube.
You can see it in this Main Frame diagram:

http://www.realoem.com/bmw/enUS/showpar ... Id=46_0070
Ced.

R1100RT 1996.
Sent by Boson Quantum Transmission from the Starship 'Galahad'.
http://www.researchgate.net/publication ... ing_bosons" - It works!

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Re: 1989 BMW R80

Postby Karl740 » Mon Feb 12, 2018 10:24 pm

Things coming along nicely. Side stand fitted after purchasing the missing parts.

Fuel tank has been resprayed but there is three exits on the underside of the tank. Obvious one either side for the fuel taps but one smaller exit centrally underneath. I can’t for the life of me remember what was attached to this exit and after reviewing the original fuel lines they seem to only run from the fuel taps to the carbs. Anyone shed any light what could’ve been attached to this third hole?

Thanks

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Re: 1989 BMW R80

Postby boxerman » Mon Feb 12, 2018 10:26 pm

The breather pipe.
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Re: 1989 BMW R80

Postby Roy Gavin » Tue Feb 13, 2018 5:21 am

If you have the flat plate top triple clamp it is difficult to difficult to reassemble the forks straight single handedly.
And probably even harder if you have a couple of experts helping, Randy's article in hand-------.
Depending on how hard a life the bike has has the triple might even be out of shape by now.
Easiest way is to get a billet top triple , SJBMW and Toaster Tan both make item which work better than a flat plate and no special alignment technique is required.

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Re: 1989 BMW R80

Postby Rob Frankhamr » Tue Feb 13, 2018 10:34 am

Things coming along nicely. Side stand fitted after purchasing the missing parts.

Fuel tank has been resprayed but there is three exits on the underside of the tank. Obvious one either side for the fuel taps but one smaller exit centrally underneath. I can’t for the life of me remember what was attached to this exit and after reviewing the original fuel lines they seem to only run from the fuel taps to the carbs. Anyone shed any light what could’ve been attached to this third hole?

Thanks
The third exit is a vent and drain for the well around the filler cap. It functions as a breather for the tank and to drain any fluids that might be get into the well. It should have a length of hose connected to it and this should be long enough to go back and discharge behind the swing arm. It's quite possible that this hose was missing when you dismantled the bike. You often see bikes with it not present either because it's 'non-essential' or just due to carelesness. The bike will run perfectly well without it but it isn't wise to ignore it as, without it, any fluids that get into the well will end up on top of the engine. Not a problem if it's water but the idea of petrol being showered over a red hot engine during a fill up isn't something to take lightly.

The BMW part number is 16 13 1 237 912 but in reality it's just a length of thin walled 6mm hose about 750mm long.

Hope that helps

Rob
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Re: 1989 BMW R80

Postby Karl740 » Tue Feb 13, 2018 8:43 pm

Things coming along nicely. Side stand fitted after purchasing the missing parts.

Fuel tank has been resprayed but there is three exits on the underside of the tank. Obvious one either side for the fuel taps but one smaller exit centrally underneath. I can’t for the life of me remember what was attached to this exit and after reviewing the original fuel lines they seem to only run from the fuel taps to the carbs. Anyone shed any light what could’ve been attached to this third hole?

Thanks
The third exit is a vent and drain for the well around the filler cap. It functions as a breather for the tank and to drain any fluids that might be get into the well. It should have a length of hose connected to it and this should be long enough to go back and discharge behind the swing arm. It's quite possible that this hose was missing when you dismantled the bike. You often see bikes with it not present either because it's 'non-essential' or just due to carelesness. The bike will run perfectly well without it but it isn't wise to ignore it as, without it, any fluids that get into the well will end up on top of the engine. Not a problem if it's water but the idea of petrol being showered over a red hot engine during a fill up isn't something to take lightly.

The BMW part number is 16 13 1 237 912 but in reality it's just a length of thin walled 6mm hose about 750mm long.

Hope that helps

Rob

Thanks for the info. I knew it was a breather pipe of sorts but was racking my mind as there definitely wasn’t anything connected to it when I removed the tank as I would’ve noticed at the time. As you said it isn’t ideal to have it missing but is this common amongst airhead owners?

Do you know where I can find pictures of the routing of the breather pipe as I don’t want it chucking any liquid near the back wheel?

Thanks

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Re: 1989 BMW R80

Postby SteveD » Wed Feb 14, 2018 8:41 am

I'd be interested to hear how many of us bother with any extension. I've not used one for years.
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Re: 1989 BMW R80

Postby Memphis Twin » Wed Feb 14, 2018 12:52 pm

Nor have I.

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Re: 1989 BMW R80

Postby Rob Frankhamr » Wed Feb 14, 2018 1:19 pm

I do...

I've never heard of a Boxer going up in smoke because of fuel splashing over the engine but the idea of allowing petrol to run over a hot motor in the close vicinity of a component that, by it's nature, is likely to produce some pretty high energy sparks (The starter motor) and directly under a newly filled fuel tank is not something I care to contemplate... especially when the vehicle is likely to be in a fuel station when it occurs... and even more especially as the rider is likely to be sitting on the machine when he/she presses the starter (read detonator) button.

I have known of a couple of instances of bikes 'going up' under their riders (don't know what sort of bikes) and the results are not pretty. To my mind a couple of quid spent on a length of hose to make sure it doesn't happen to me is money very well spent.

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Re: 1989 BMW R80

Postby Rob Frankhamr » Wed Feb 14, 2018 1:37 pm


Do you know where I can find pictures of the routing of the breather pipe as I don’t want it chucking any liquid near the back wheel?

Thanks
No sorry, I don't have any pictures of that. I always route it from the spigot alongside the main frame tube to the rear then follow the frame down to bring the hose out between the swing arm and the rear frame tube. A couple of cable ties serve to hold it in place. Not too worried about stuff getting on the rear wheel. Only water is likely to get through when the bike is moving and, should a significant amount of fuel be spilt when stationary, I'd be inclined to move the bike away before starting.

Rob
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Re: 1989 BMW R80

Postby andyb » Wed Feb 14, 2018 2:08 pm

I filled my bike up one summer, then parked it at the garage to eat something, came out and the fuel had expanded and was coming out of the vent tube. So it does have it’s use
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Re: 1989 BMW R80

Postby Rob Frankhamr » Thu Feb 15, 2018 10:26 pm

I filled my bike up one summer, then parked it at the garage to eat something, came out and the fuel had expanded and was coming out of the vent tube. So it does have it’s use
Andyb
Yes, that's definitely something to bear in mind. In my last house, there was a fuel station about half a mile from home. A couple of times I filled up in the evening and went to the bike next day to find the garage stinking of petrol.

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Re: 1989 BMW R80

Postby SteveD » Fri Feb 16, 2018 1:36 pm

Yeah I guess that's the trap. Avoid even slight overfilling especially if the bike is to be parked.
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Re: 1989 BMW R80

Postby Karl740 » Fri Feb 16, 2018 9:54 pm

Thanks for the feedback

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Re: 1989 BMW R80

Postby Karl740 » Sun Feb 18, 2018 1:41 pm

I’ve gone to fit my new tyres today, the rear 4x18 fits fine but the front 3.25x19 is too big.

These measurements were taken from the manual, I’ve tried fitting Avon’s.

I think I’ll need to change the front for an 18 but anyone know what might’ve happened here?

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Re: 1989 BMW R80

Postby boxerman » Sun Feb 18, 2018 3:46 pm

but anyone know what might’ve happened here?
Yes, it's simple. You've read the spec for a twin shock bike!!! ALL Airhead Monos use 18" front and rear.
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Re: 1989 BMW R80

Postby Karl740 » Sun Feb 18, 2018 8:01 pm

but anyone know what might’ve happened here?
Yes, it's simple. You've read the spec for a twin shock bike!!! ALL Airhead Monos use 18" front and rear.
Marvellous! Thanks for confirming

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Re: 1989 BMW R80

Postby Roy Gavin » Mon Feb 19, 2018 9:52 am

Except the G/S, of course!


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