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Old 05-27-2012, 11:42 PM   #871
Eddieb
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So how is the 2nd cam driven?
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Old 05-28-2012, 12:08 AM   #872
igormortis
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Originally Posted by Box'a'bits View Post
Oh, and please please please can someone buy me these? I promise I'll be very good.
Why, oh why did you post that?
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Old 05-28-2012, 12:17 AM   #873
Padmei
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i think I've got a set of those stashed away somewhere. I was gonna take them to the recycling...
Seriously tho if they were that good they would still be manufactured & be featured on more bikes. 4 valves is 2 valves too many.
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Old 05-28-2012, 12:41 AM   #874
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Quote:
Originally Posted by Eddieb View Post
So how is the 2nd cam driven?
Still pushrods. Not a 2nd cam.



Quote:
Originally Posted by Padmei View Post
i think I've got a set of those stashed away somewhere. I was gonna take them to the recycling...
Seriously tho if they were that good they would still be manufactured & be featured on more bikes. 4 valves is 2 valves too many.
Jump from 68bhp to 82bhp. Totally worth it...buuut they did come with issues. The valve springs were too strong, so cams & followers became a consumable (every 30k miles or so). Higher compression, better breathing, better ignition (central spark plug rather than having waaaay off to the side). Huge money to buy new, back in the day, so not so many around.

The oilheads are 4 valves. BMW just didn't go there with the airheads, which they had already had one go at killing off.

BTW, I have a copy of that 2006 Classic Bike mag the ebay blurb talks about, if anyone wants a photocopy. Interesting stuff
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Old 05-28-2012, 01:26 AM   #875
igormortis
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BTW, I have a copy of that 2006 Classic Bike mag the ebay blurb talks about, if anyone wants a photocopy. Interesting stuff
Yeah, are you able to scan it?
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Old 05-28-2012, 01:31 AM   #876
Voltaire
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Back in 1990 I bought an R100RS from the BMW dealer in Clapham London.....it was a dog cosmetically but ran well.
I rode it to work for a couple of years then decided to rebuild it. By chance I came upon two sets of Krauser heads, one set was pretty good and the other tired and there were no pistons. Bought them off a BMW tuner near Oxford for ...about 300 quid. I thought I had struck gold.....this was pre internet so info was not that easy to get...
My local BMW dealer were not that interested in the older stuff but Bob Porecha in Sydenham was. They talked me out of the Krauser heads and I went twin plugged, 40mm Dells, later flywheel....the bike was amazing to ride....swapped the front end to a Brembo type one and fitted frame bracing. I sold the heads off to someone who thought he had struck gold.....
I have heard of a set up here but they are not for sale as far as I know ..they are ex a Welly racer from the 90's ( I have been told).......My BMW guru says not to even bother with twin plugs on the racer. The high HP bikes in racing are using R80 heads with bigger valves and porting....but thats all I can find out on those so far.
Thats my 2 fennigs worth on Krauser heads.....they do look cool though.
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Old 05-28-2012, 01:32 AM   #877
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Yeah, are you able to scan it?
Have to take it to work - the scanner here has 'issues' after Katherine tried to 'fix' a printer problem. . PM your email address, & I'll flick it across in the next day or so.

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Back in 1990 I bought an R100RS from the BMW dealer in Clapham London.....
Got all my parts there. But my RS came from Park Lane BMW
(actually a little garage a few streets back, way down in the bowels of the bulding - I think they were ashamed of it, so tried to get rid of it thru MCN).
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I have heard of a set up here but they are not for sale as far as I know ..they are ex a Welly racer from the 90's ( I have been told).
Duncan McKee
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Box'a'bits screwed with this post 05-28-2012 at 01:38 AM
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Old 05-28-2012, 04:16 AM   #878
innathyzit
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My Fleabay purchase, from the UK. It'll cost as much again to get it here. 10+ kgs & bulky. Still way cheaper than new. Stainless 2 into 2. Tried to get dyno info & weights from Keihans - nothing available. They actually referred me to a German agent because the system has gone thru the TuV system.



I've not resolved the gearbox issue yet - but I can fit the RS box & heavy (lightened) flywheel if I change the seal to a Paralever.

Oh, and please please please can someone buy me these? I promise I'll be very good.

Those pistons are just weird looking, the valve cutouts are out 90 degrees from any other piston I seen. Was talking to a guy the other day who had his brother in auckland do a lot of work on his r80 heads and got huge hp gains with the head mods and mikuni carbs.he did a lot of welding and re-shaping of the ports and modified them to fit a huuuuge intake valve.

BTW any Nads got an electric dremmel/porting tool? need to open up the inlet port and manifold on my Benelli.
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Old 05-28-2012, 12:53 PM   #879
Padmei
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BTW any Nads got an electric dremmel/porting tool? need to open up the inlet port and manifold on my Benelli.
I've got a ryobi dremel if that's what you want. I don't think I'll be passing Richmond this week tho.
Nutso some of your pics are coming across just as boxes with x s in them. Am I the only one with this?
I was looking at a caferaceer last nite with these heads.
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Old 05-28-2012, 01:36 PM   #880
Eddieb
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Nutso some of your pics are coming across just as boxes with x s in them. Am I the only one with this?
No problems for me
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Old 05-28-2012, 01:44 PM   #881
Voltaire
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Quote:
Originally Posted by innathyzit View Post
Those pistons are just weird looking, the valve cutouts are out 90 degrees from any other piston I seen. Was talking to a guy the other day who had his brother in auckland do a lot of work on his r80 heads and got huge hp gains with the head mods and mikuni carbs.he did a lot of welding and re-shaping of the ports and modified them to fit a huuuuge intake valve.

BTW any Nads got an electric dremmel/porting tool? need to open up the inlet port and manifold on my Benelli.
Hi Innathyzit, I've heard from a couple of the racer guys that the r80 heads are the way to more power. I'd be interested to hear a bit more on this....and I live in Auckland
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Old 05-28-2012, 03:39 PM   #882
igormortis
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I'd be interested to hear a bit more on this...
Yes - me too!
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Old 05-29-2012, 01:17 AM   #883
innathyzit
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Hi Innathyzit, I've heard from a couple of the racer guys that the r80 heads are the way to more power. I'd be interested to hear a bit more on this....and I live in Auckland

This guy, very clever apparently.

http://www.danbymachine.co.nz/index.html

You now know as much as I do, probly worth a call though.
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Old 05-31-2012, 02:11 AM   #884
NordieBoy
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BTW any Nads got an electric dremmel/porting tool? need to open up the inlet port and manifold on my Benelli.
Dad just happens to have a proper electric porting tool and he's in Richmond.

I used my dremel with a small sanding drum on the XR but I didn't know what I was doing.
So the fact it goes fcukin well and has for 6 years or so was a nice surprise
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Old 05-31-2012, 02:21 AM   #885
innathyzit
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Dad just happens to have a proper electric porting tool and he's in Richmond.

I used my dremel with a small sanding drum on the XR but I didn't know what I was doing.
So the fact it goes fcukin well and has for 6 years or so was a nice surprise
might take you up on that offer. Does the emporium contain an xr250 carby? and what size is a standard xr carby?

Edit, sorry for hogging thread.
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