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Old 10-18-2014, 06:14 PM   #1
remus OP
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1st bmw purchase

Hi all,

I've been looking at different airheads to buy as my first bmw motorcycle. I like the r100cs and the 1995 r80r and 1995 r100r classic bikes.

Is there any big difference in the motors between the r100cs and the more modern bikes made in 1995 ?

Also I would be interested in making the bikes engine quieter, any comments about that ?

Thanks in advance for your time.
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Old 10-18-2014, 07:01 PM   #2
ME 109
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Hello remus, as everyone here agrees, the 1981 RS, 507 colour scheme is the best airhead ever made.
I'm sure everyone will be along shortly to back me up.

As for making the bike quieter, here is my solution.
https://www.youtube.com/watch?featur...&v=P7Ancoug87g
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Old 10-18-2014, 07:07 PM   #3
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There are differences. The CS is from the early 80s and has 40mm carbs (as opposed to 32mm) with possibly higher compression than the R100s after 87. I've heard that the heads flow better on the newer ones. Other than that, they're pretty much the same. One of the guys in the area had an 89 R100RS and he complained that it was low on power and guzzled gas. He modified it quite heavily to match the earlier bikes, but don't think he was ever really happy with it.

But the newer bikes handle very well, and I've heard other reports that they're just as powerful as earlier bikes and can have good gas mileage. So who knows?

As for noise, that's hard to say. If it's got very loose valves, yes! If the cam chain needs to be replaced, yes! But they do make a lot of little noises - most of us love the way they sound. They sound a little like a well-oiled sewing machine stitching down the road.
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Old 10-18-2014, 10:12 PM   #4
Mark Manley
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Airheads can vary a lot in character not only from one model to the other but one individual bike to the next and for that reason would suggest you ask to test ride the bikes you are interested in and see which one you prefer, assuming the seller will let you.
The later bikes will have a more modern feel with better brakes, suspension and a softer power delivery from the engine where as the CS will have more power and a slightly more lumpy feel.
I personally would go for the R100R as I am quite a steady rider but for fast cruising the CS would be a better bike as it has higher gearing and a more sporty riding position.
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Old 10-18-2014, 10:28 PM   #5
akabeton
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Quote:
Originally Posted by ME 109 View Post
Hello remus, as everyone here agrees, the 1981 RS, 507 colour scheme is the best airhead ever made.
I'm sure everyone will be along shortly to back me up.

As for making the bike quieter, here is my solution.
https://www.youtube.com/watch?featur...&v=P7Ancoug87g

Can't believe how low your bike idles
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Old 10-19-2014, 12:58 AM   #6
Souljer
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Quote:
Originally Posted by ME 109 View Post
Hello remus, as everyone here agrees, the 1981 RS, 507 colour scheme is the best airhead ever made.
I'm sure everyone will be along shortly to back me up.

As for making the bike quieter, here is my solution.
https://www.youtube.com/watch?featur...&v=P7Ancoug87g
However if you are not able to harness the awesome forces of gravity in the direction you're going,
I would simply recommend some better ear plugs.

I wasn't lucky enough to find a RS in my budget so I settled for this:
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Old 10-19-2014, 01:24 AM   #7
FrankR80GS
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Quote:
Originally Posted by remus View Post
...
Is there any big difference in the motors between the r100cs and the more modern bikes made in 1995 ?

Also I would be interested in making the bikes engine quieter, any comments about that ?
...
Welcome to airhead madness! You will love it - after several disappointments.
The monolever and paralever bikes drive much better than the older ones. Newer 1000ccm engines have less hp due to emission and noise regulations in most countries. The old 51kW engines need high octane petrol (98ROZ) otherwise you have to adapt the ignition, which results in less power in higher consumption. I'd recommend a past '88 800ccm engine. They run smoothly even with 91 ROZ petrol (but a little better with 95) and don't guzzle that much petrol. In particular the R100GS (40mm carbs) is heavy on gas. Stay away from engines with SLS.
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Old 10-19-2014, 06:31 AM   #8
100RT
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Quote:
Originally Posted by ME 109 View Post
Hello remus, as everyone here agrees, the 1981 RS, 507 colour scheme is the best airhead ever made.
I'm sure everyone will be along shortly to back me up.

As for making the bike quieter, here is my solution.
https://www.youtube.com/watch?featur...&v=P7Ancoug87g
Sounds like something is ready to fall off.
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Old 10-19-2014, 09:15 AM   #9
CafeDude
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Quote:
Originally Posted by ME 109 View Post
Hello remus, as everyone here agrees, the 1981 RS, 507 colour scheme is the best airhead ever made.
I'm sure everyone will be along shortly to back me up.

As for making the bike quieter, here is my solution.
https://www.youtube.com/watch?featur...&v=P7Ancoug87g
What is that farting noise? It sounds awful. Maybe it's the recording device?
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Old 10-19-2014, 10:51 AM   #10
ME 109
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The farting noise would no doubt have been me.

The annoying noise is my screen trying to jump off. Amazingly the Gopro doesn't show the screen jumping up and down, rattling.
I've since fixed it by using a small nut, bolt and rubber washers either side, on the rearmost screen holes.
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Old 10-19-2014, 11:25 AM   #11
100RT
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Originally Posted by ME 109 View Post
The farting noise would no doubt have been me.
Dont worry the farting noise will go away as you get older. It will be more of a bubbling noise that makes the seat get slippery!

Where is the GO-Pro mounted. I have been thinking of getting one but undecided right now.
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Old 10-19-2014, 11:59 AM   #12
ME 109
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Originally Posted by 100RT View Post
Dont worry the farting noise will go away as you get older. It will be more of a bubbling noise that makes the seat get slippery!

Where is the GO-Pro mounted. I have been thinking of getting one but undecided right now.
Gopro is mounted in front of my mouth, on my full face helmet. This position gives the most realistic riders perspective, as opposed to being mounted up on top, or in the side of the helmet.
The Gopro Hero2 is a good unit with broadcast quality vision.
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Old 10-19-2014, 02:32 PM   #13
disston
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If you mount the GoPro in front of your eyes you would get the absolute best perspective.
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Old 10-19-2014, 03:11 PM   #14
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If you mount the GoPro in front of your eyes you would get the absolute best perspective.
For us, you mean.......
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Old Yesterday, 04:41 PM   #15
remus OP
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This R90S looks great, and has had a bit of work done to it. Its expensive though. But I guess that's what they are worth... I don't think I'd want to use a classic as an every day bike though.
http://www.ebay.com.au/itm/Classic-N...item4d248d575d

The pickings are pretty slim here in Australia compared to overseas. There are lots of BMW airheads for sale in Germany from the 80's to the 90's... BUT they are in EURO's and the currency conversion means the bike will cost an extra 30% AND then I have to pay about 2000 to 2500 dollars to get it here.

There seem to be lots for sale in the USA as well, however the price of getting them here is high as well.
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