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Old 02-17-2011, 11:56 PM   #1
dirtsurfer OP
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R80 to R100 conversion

I'm looking for a two up tourer and quite fancy an R100 but a nice 1985 R80 Rt has caught my eye. I am thinking R100 conversion might be in order for two up touring. What's the consensus?
Also is it just a matter of changing the barrels or is some carburetor adjustments in order? Please point me to the threads where this topic has been done to death, reincarnated , then done to death again. Thanks
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Old 02-18-2011, 12:06 AM   #2
jellycow
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Get the R80, ride along for a few months and then decide if you still 'need' those extra HP. The torque and smoothness of the R80 engine will suit most so just give it a try.
(Then spent the money saved on the 1000cc conversion on suspension or brakes or anything.)

But to not-quite-answer your question:
The swap is simple, someone will point you to some thread. Swap barrels, re-jet the carbs and you're done. The heads are not a must to swap for they might work if you want torque. Most depends on your demands.
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Old 02-18-2011, 12:34 AM   #3
Rob Farmer
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To do a full conversion you need heads, barrels, pistons, Final drive with a matching speedo. It's simpler to just buy a 1000 in the first place. As jellycow says though If you like the 80 buy it and try it you may be quite happy with it.
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Old 02-18-2011, 01:43 AM   #4
davorallyfan
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I've a Seibenrock kit 1000cc heading my way at the moment to upgrade my R80GS - just wanna get the back sliding a bit more on the windy gravel roads.

Kit has lightweight pistons, pins, new nicasil barrells, pushrods, ss tubes. Uses the R80 head.

10 hp extra is what they say - we will see.

The Au$$ie dollar is magic at the moment.
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Old 02-18-2011, 01:46 AM   #5
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You could fit Siebenrock 1000cc conversion kit.

Only barrels and pistons.
These are a straight fit, no use to alter heads, exhaust and carb's, they are designed to work with the std R80 config.

I've fitted them on a mate's R80 hack and was amazed by the way it worked out.

Paul.
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Old 02-18-2011, 03:38 AM   #6
bikerfish
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I put 300,000 miles on an r80gs, lots of it 2 up. with that bike needing some TLC, I've been using an r100/7 and an r100r. usually 2 up also. I honestly can't tell much difference. the 1000cc motors have a little bit more grunt, but the 800 is smoother.
if it were me and the r80 is in good shape, I'd leave it alone and ride the wheels off it!
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Old 02-18-2011, 03:45 AM   #7
jellycow
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bikerfish, I'm being curious here. Was there a difference in MPG between the 80 and the 100's?
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Old 02-21-2011, 01:37 AM   #8
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Quote:
Originally Posted by PaulRS View Post
You could fit Siebenrock 1000cc conversion kit.

Only barrels and pistons.
These are a straight fit, no use to alter heads, exhaust and carb's, they are designed to work with the std R80 config.

I've fitted them on a mate's R80 hack and was amazed by the way it worked out.

Paul.
Waiting to be amazed



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Old 03-03-2011, 01:15 AM   #9
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Smoother than the 80 and more boof through the middle.

And it aint run in yet.






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davorallyfan screwed with this post 03-03-2011 at 01:21 AM
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