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Old 08-23-2010, 12:35 PM   #1
Ras Thurlo OP
Desert Lion
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Joined: Aug 2010
Location: Hillcountry, Italy
Oddometer: 669
R80GS vs R100GS

I am about to pull the trigger on a paralever GS and wanted to hear feedback on the 80 vs 100 engine.

The principal thing I was looking out for is that torquey grunt of 20-50mph when you open up. I dont really acre about two-up longhaul touring.

I have heard that people say the 80 is smoother and there in no appreciable difference under say 70mph. Is this the case?

Also I have heard that some people add the Siebenrock conversion to the stock 80s and that this gives better performance/smoothness than the factory 100. This is a comparative with the stock 100 but again is there much difference between an 80 and a Sibenrock 100?
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Old 08-23-2010, 05:58 PM   #2
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Joined: Apr 2005
Location: Dave Rankine, Reno NV
Oddometer: 1,292
The correct forum for this bike is Old's Cool. However I have owned both bikes one in the 80's and the others (R100's) more recently. The 80 is smoother due to less reciprocating mass. You don't notice the power difference that much (below 70mph) because it's geared lower. The 80 starts to get winded about 80 mph the 100 maybe in the 90's. Until the F800 came out R80's in good shape sold for about 3 times what they were new. I think prices have moderated a bit. 100's are valuable, but more common. The R80 is a much more competent bike off pavement than the 100. The 80 is lighter and if memory serves feels lower.

I have never heard of stubornrock or whatever. As a almost 30 year BMW rider the fact I don't know it makes me think it's crap. Watch the mods you make to an Airhead. Some years ago cc products made some lightweight valves to enhance performance. Those valves destroyed more Airheads than anything else. Ohlins shocks, progressive springs, Billit front brake, police regulator, OK, but the rest should be stock.

Either way they are easy to maintain. You can get new parts for almost anything. And some dealers like Resycle in Ohio specialize in used parts. If this is your first Airhead go to and join that club and there chat list at micapeak. Dave
Pavement! We don't need no stinkin pavement.
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