1978 BMW R100S Engine - Reassembled

Spent a few hours reassembling the short block after dealing with the missing oil passage hole issue on the left cylinder side. Since I have the engine apart, I might as well show what's in it. The only other noteworthy parts I left out and not pictured here are the 320 degree mid-range sports camshaft and titanium valve retainers / dual valve springs.

The top-end cylinder jugs and heads are powder-coated. Venturi intake spigots are fitted to the heads for the Dellorto conversion. Custom modern pistons are used.

The top-end cylinder jugs and heads are powder-coated. Venturi intake spigots are fitted to the heads for the Dellorto conversion. Custom modern pistons are used.

A Enduralast 450w Charging System will be used for the build. Available in my store - Link

A Enduralast 450w Charging System will be used for the build. Available in my store - Link

Instead of a machined lightweight flywheel for pre-1981 airheads, I retrofitted a 81-84 flywheel and clutch assembly. To do this the gearbox will have to be retrofitted too with 81 on parts.

Instead of a machined lightweight flywheel for pre-1981 airheads, I retrofitted a 81-84 flywheel and clutch assembly. To do this the gearbox will have to be retrofitted too with 81 on parts.

A aftermarket lightweight starter weighing 7 pounds with 70% more output than the old Bosch starter. If interested please contact me, I'll have this on my webstore soon.

A aftermarket lightweight starter weighing 7 pounds with 70% more output than the old Bosch starter. If interested please contact me, I'll have this on my webstore soon.

I should of taken a picture before installing the rods. I had the connecting rods lightened, see how much material was taken off compared to the old rods.

I should of taken a picture before installing the rods. I had the connecting rods lightened, see how much material was taken off compared to the old rods.

You can see where more of the material on the lightened rods were taken off around the journal and bolt area.

You can see where more of the material on the lightened rods were taken off around the journal and bolt area.