Exotic and Vintage Motorcycle Repair

The chambers, seats and finally the ports are finished.  What follows are some photos and video that may be interesting to some of you. He...

The last part of the combustion chamber modification is to measure and equalize the volumes.  The target volume was 80cc which will yield a ...

 When all you get from the starter is a whizzing sound, this is why.  All of the metal that used to be part of the gear is now circulating t...

Installing the valve guides: Here is the shop-made driver that drives on the top shoulder of the guide, it is piloted and counterbored so a...

Both chambers are roughly mirror images of each other.  Once I've machined new seats they will be installed along with new valve guides....

The valve seats are removed and the combustion chambers are welded. The deck surface is trued and the squish area contour are done after...

A few people have asked to see the engine in the bike so here are some photos.  The instruments are out being restored and upon their return...

The usual route to "performance" with BMW's airhead engines is the typical American hot-rodder's approach, big valves, big...

It's an '88 R100RS.  Problems are soggy performance and exhaust clearances tightening up very quickly. Here is what the exhaust ...

It is ready to go back into the frame and after break-in will be returned to the owner.  I want to take this opportunity to thank Mitch Kle...