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Old 12-01-2014, 10:04 PM   #1
bonescustomparts OP
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1978 r100rt - is it worth it

Hi folks. I'm new to the forum and never really thought I would be looking at BMW motorcycles. I've had many bikes and own a 2001 Harley Dyna. Heres where I need some advice. Im looking at a 1978 R100RT for a $1,000. I went and drove it and it runs great. A little ticking and after talking to the guy for a while he says the oil light will come on when its hot out. He thinks the oil pump may be worn and needs replaced. I believe the ticking is from the lifters. It shifts nice and brakes and gauges all work. I noticed that the lower part of the fairing is cracked where it goes under the cylinder head. I know how to fix fiberglass so that's not a problem. The overall apperance is rough but the bike is rideable. I have always done my own work from building race motors to show bikes. I want to do a full restore and would like your opinions even if I should buy it. I feel its a great start for a project but like I said I haven't any experience on the BMW Motorcycle. Opinions appreciated.

Also, nice to visit your board and hope to be part of it in the future.
Thanks
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Old 12-01-2014, 10:10 PM   #2
bonescustomparts OP
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I forgot the picture. Sorry for screwing and hopefully the picture shows up.
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Old 12-01-2014, 10:18 PM   #3
CafeDude
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RT's are great touring bikes. Looks like a solid foundation for a restoration, or a custom bike. The asking price is certainly right, pretty hard to find one as complete as that one for that sort of dough.

Oh, and welcome!
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Old 12-01-2014, 10:23 PM   #4
Kt-88
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DO IT. You can't lose at that price for a runner.
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Old 12-01-2014, 11:53 PM   #5
OLD GREEN
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I'd get it for a thousand bucks. RT's make for a real nice winter bikes.
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Old 12-02-2014, 12:13 AM   #6
ME 109
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I'd be keen to find out more about the oil light. Oil pumps don't wear out that much.

A flickering oil light at hot idle on a hot day is one thing, oil light staying on is another. It could be as simple as the wrong sender unit, or possibly stuffed big ends, or screwed mains.
The ticking could be low oil pressure too.
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Old 12-02-2014, 12:59 AM   #7
Bill Harris
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1978? $2000 o-ring.

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Old 12-02-2014, 02:08 AM   #8
ME 109
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Quote:
Originally Posted by Bill Harris View Post
1978? $2000 o-ring.

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One good point tho about the 2,000 dollar o ring, is it's seemingly unaffected by inflation. It's getting cheaper to fix.
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Old 12-02-2014, 03:29 AM   #9
patrkbukly
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Buy it

its a good deal.

Light may be from a misaligned oring on the filter as said above.


Or give me his number.
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Old 12-02-2014, 04:10 AM   #10
SohoPhil
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+ on the get it.
Oil light could be anything from low idle (800-900 rpm) to much worse.
I'm guessing probably not.
Ticking could be need of valve adjustment too. These motors do make a little noise.
Got mine for $900 last November. Did a refresh and a few new items and
it's been a blast.
If you don't want it and your in the northeast pm me the sellers info!
Wifey will let me have another for a grand
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Old 12-02-2014, 05:07 AM   #11
100RT
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The fairing lowers have a split under the cylinder so they can be removed without taking off the exhaust. If you do a repair use an epoxy based resin not polyester resin.
My pretty 81 RT was backed into and knocked over this fall with several damaged panels. Not sure what route I will take to get it back. Considering turning it into a fake S.
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Old 12-02-2014, 06:08 AM   #12
therealbatman
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RUN AWAY don't walk! ....but before you start running please send me the seller contact info.

At $1000 for a running airhead, you can hardly go wrong.
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Old 12-02-2014, 06:24 AM   #13
Jim K in PA
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Verify which light is coming on. It may be the alternator light, rather than the oil pressure light. I confused them when I first got my '79.

Welcome to the asylum.
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Old 12-02-2014, 08:45 AM   #14
bonescustomparts OP
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You guys are awesome fast at answering.

Ok. 2k o-ring........enlighten me please. I can rebuild anything if i have to.

I sure appreciate your help.
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Old 12-02-2014, 08:56 AM   #15
WoVo
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The oil-filter chamber is a steel tube integrated in the engine housing.
This steel tube is sealed to the outer aluminium cover (3 screws) with an o-ring and a copper ring at the >81 engines.
If the backstand of the chambertube ist >3,3mm or you forget the copper ring, sealing fails - pressurized oil to the sump and your engine bearings die.
2000 Dollar for a new engine...
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