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Old 07-20-2012, 03:50 PM   #1366
igormortis
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Originally Posted by Dmaster View Post
Shop envy? Why?
What they mean is, that they’d like to have that as their own workshop. Me too!
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Old 07-20-2012, 03:58 PM   #1367
tdrrally
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i keep thinking about selling my airhead, then i look at this thread
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Old 10-20-2012, 08:14 AM   #1368
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i need some input on shocks for the airhead project

i plan on using dr forks and a 21" wheel along with a longer swing arm

i have no budget so lets keep it real please

i would love a set of ohlins if they are free or very near
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Old 10-20-2012, 08:34 AM   #1369
Big Bamboo
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Back to the original subject, I don't know if this has been posted before, but here's a link to video of some factory /5 dirt bikes doing the ISDT. Wait for the large box on the left to play the whole video: http://www.historischesarchiv.bmw.de...oldergroup=irc
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Old 10-20-2012, 11:40 AM   #1370
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Originally Posted by Big Bamboo View Post
Back to the original subject, I don't know if this has been posted before, but here's a link to video of some factory /5 dirt bikes doing the ISDT. Wait for the large box on the left to play the whole video: http://www.historischesarchiv.bmw.de...oldergroup=irc

some nice air they got would love to have one to have on. does any body have a side shot the bike.
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Old 10-20-2012, 12:29 PM   #1371
Big Bamboo
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Here you go:

Page says it's an R80:

Big Bamboo screwed with this post 10-20-2012 at 12:37 PM
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Old 10-20-2012, 12:37 PM   #1372
Airhead Wrangler
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Originally Posted by Big Bamboo View Post
Page says it's an R80:
mmm, sort of. It used a R65 crank with 1000cc barrels for a displacement of about 850cc. In terms of power delivery it's very different from an R80. Much revvier.
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Old 10-20-2012, 12:40 PM   #1373
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Do you ever find yourself making "yum-yum" noises with these bikes instead of "vroom-vroom", or is that just me?
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Old 10-20-2012, 12:44 PM   #1374
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Quote:
Originally Posted by Airhead Wrangler View Post
mmm, sort of. It used a R65 crank with 1000cc barrels for a displacement of about 850cc. In terms of power delivery it's very different from an R80. Much revvier.

specially when you lighten the flywheel and add flatslides.

My question: can the 1000CC barrels just plug right into the R65 case? I seem to recall Mr. Rooney saying that was do-able without any major molestation of the cylinders.

And if thats the case, do you preserve the narrowness of the overall dimesions? I mean is the case narrower to accomdate the short stroke, or is the case the same and the cylinders narower?
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Old 10-20-2012, 01:13 PM   #1375
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I seem to recall Mr. Rooney saying that was do-able without any major molestation of the cylinders.
They get molested big time. The cylinders have to be shortened to match the r65 stroke and the case has to have the cylinder holes bored out quite a bit to fit the bigger barrels. Also, you have to recut the pushrod tube bores in the cylinders at a different angle to account for the cylinders being shorter. Not a bolt-on affair.
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Old 10-20-2012, 01:19 PM   #1376
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ugh! that sounds like a right nightmare. I'll take an R100, screw the 40mm. Sheesh. I prefer to lug it, anyway. Its suspension that I need to do properly.
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Old 10-20-2012, 03:28 PM   #1377
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Originally Posted by Airhead Wrangler View Post
They get molested big time. The cylinders have to be shortened to match the r65 stroke and the case has to have the cylinder holes bored out quite a bit to fit the bigger barrels. Also, you have to recut the pushrod tube bores in the cylinders at a different angle to account for the cylinders being shorter. Not a bolt-on affair.
More simple to put a 65 crank in a 100 case, just shorten the barrels to match the stroke, the pushrod bore in the case are less angled too so the recut tubes are more straight. And best, you can use enduro camshaft, or even R100 rods and less barrels grinding.
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Old 10-28-2012, 12:17 PM   #1378
Ras Thurlo
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Great Bike

Quote:
Originally Posted by CrazyIvan View Post
What is this rear frame set up on this "famous" bike?

- Q.Tech rear subframe?

- HPN seat?

- Acerbis rear mudguard?


btw- I like 'em dirty

Ras Thurlo screwed with this post 10-28-2012 at 12:50 PM
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Old 10-28-2012, 02:14 PM   #1379
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Airhead dirtbikes

I am looking at several pics with the brake arm reversed to put the brake rod up out of harms way. That makes the brake cam work backwards, what are they doing to rectify this? I would like to use a high brake rod on my R-75 ISDT replica.
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Old 10-28-2012, 02:47 PM   #1380
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Originally Posted by isdt BMW View Post
I am looking at several pics with the brake arm reversed to put the brake rod up out of harms way. That makes the brake cam work backwards, what are they doing to rectify this? I would like to use a high brake rod on my R-75 ISDT replica.

SOmetimes the brake cam is ambiguous, its not a cam so much as a flat plate, and it can work ambidextrously. I forget which model has that option, not my GS I'll tell you.

The problem then becomes putting the brake lever point at the right place to not actuate the brake at full compression.
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