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  1. Siebenrock power kit for R90/6; Completed! Thoughts on re-torqueing head?

    Cylinders/kit arrived on Tuesday. Wednesday I cleaned the garage/work area to operating room cleanliness (it needed it). Thursday I installed the kit. The people at Ted's Beemer Shop were beyond...
  2. Siebenrock kit for R90/6; Pre-installation questions, opinions?

    After more than a month on back order my Siebenrock power kit arrived from the Beemer Shop. It appears to be a straight forward installation with not a lot of complexity, something I've done dozens...
  3. R90/6: Metzeler Lasertec's or Michelin Pilot Activ?

    I have always used Lasertec's but I'm wondering if anybody has tried them both and likes one more than the other? The Michelin's are cheaper, that is good.
  4. My impression at least of how the Siebenrock kit...

    My impression at least of how the Siebenrock kit is advertized is that it is plug and play. Although I have what I would call a lot of experience installing big bore stuff on Asian bikes, this is the...
  5. There is another thread that I started a little...

    There is another thread that I started a little over a month ago about the heads and valves, etc. One factor is that the time to do the machining for a dual plug head has come and gone. As of...
  6. Siebenrock kit for R90/6; High Comp. or Low, dual plug or single?

    I am just about ready to buy the Siebenrock big bore kit for my R90/6 (Code # 1100072). I was looking at Ted Porter's Beemer Shop website for the top end gasket kit also (Code:...
  7. First, if you're going to inadvertently shock...

    First, if you're going to inadvertently shock yourself and kick things over, I would extinguish all flames.
  8. As the centrifugal force spreads the weights out,...

    As the centrifugal force spreads the weights out, they are levered to the cam barrel. Therefore twisting the barrels position. That in itself may appear to be non-intuitive because everything is...
  9. Therefore the problem! A Lucas mechanical...

    Therefore the problem! A Lucas mechanical advance for Brit bikes in the 70's is pretty tough. The only failure I've ever seen in those old Honda advance units are seizure from sitting for years. ...
  10. Using heavier spring would in effect give you a...

    Using heavier spring would in effect give you a different advance curve. I had a similar problem on a Honda CB750/850 build. I was having a spark knock problem at low rpm/high load situations. ...
  11. One of the big problems was that the installation...

    One of the big problems was that the installation instructions were printed with such low quality that words like "send" came out looking like "sand." "Bend"="band," etc., etc. I was eventually to...
  12. Dyna III Ignition installation; lousy tech writers!?

    Continuing the R90/6 rebuild/upgrade. Installed a Mac deep sump oil pan today and started on installing a Dyna III ignition. The problem I am am having is two fold however. First, the installation...
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    Of course I will make sure but I would assume...

    Of course I will make sure but I would assume that yes, they are genuine BMW parts. Every part that I have ever bought from them has been genuine. The other day when I inquired, he was able to find...
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    In case anyone is interested, here's where I am...

    In case anyone is interested, here's where I am on all of this: Took the heads to Noland Cylinder Head in KC. Their top gurus said that the valves all look fine. Intake valve guides were fine. ...
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    Come tomorrow morning I am going to run these...

    Come tomorrow morning I am going to run these heads and valves down to the cylinder head guy I've always used (Noland Cylinder Head KC,MO). Although they are not BMW specialists I do not believe...
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    Yes, Engle is good and worthy.

    Yes, Engle is good and worthy.
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    Therein lies the problem; The local BMW shop...

    Therein lies the problem; The local BMW shop knows BMWs but would charge out the ass. The automotive machine shop that I've used for the last 10 years rebuilding heads from Honda trail 90s to Norton...
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    Both exhaust valves actually look very good. ...

    Both exhaust valves actually look very good. Their length is well within limits. The faces look great and show no signs of cupping or "tulip-ing." I have actually looked at the Black Diamond...
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    Any recommendations as far as a supplier or...

    Any recommendations as far as a supplier or brand? Does anybody offer valves and valve guides together as sets?
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    R90/6 Exhaust Valves and Valve Guides

    Preparing the R90/6 for the winter rebuild/Seibenrock kit. It was down on power and also smoked quite a bit on start up. Compression was 145 psi on left and 125 psi on right.

    Today was...
  21. Also, I was wondering about the MAC Large Oil...

    Also, I was wondering about the MAC Large Oil Sump pan. http://shop.macperformance.com/MAC-BMW-Twins-1970-1989-Large-Oil-Sump-Pan-98101.htm?categoryId=-1 Has anyone in this forum ever used it or...
  22. Much thanks! Uh, you don't happen to know...

    Much thanks! Uh, you don't happen to know anybody that has one, do you?
  23. Part number for deep sump oil pan? R90/6

    Would anybody happen to know the part number for a deep sump or extra capacity oil pan for the '76 R90/6? I'm looking at several online and want to make sure I get the right one.
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    You know, all of the advice about riding...

    You know, all of the advice about riding technique is probably true. Its been a while since my hare scrambling days. Also the advice about the RT not being necessarily suitable for rougher roads,...
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    R1200RT Riding on Gravel Roads

    I have a 2011 RT and was wondering if anyone had any insight into getting it to handle better on gravel. I'm running Michelin Pilot 3's. On pavement it is to die for but all of my other bikes...
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