Schumann Motor Works

Schumann Motor Works Specializing in vintage motorcycle cylinder head services and custom valve train components.

Two sets GL1000-1200 OEM type replacement guides finished.
06/18/2026

Two sets GL1000-1200 OEM type replacement guides finished.

GS850 standard replacement size valves, bronze guides and viton seals wrapped up headed off to another shop.
06/17/2026

GS850 standard replacement size valves, bronze guides and viton seals wrapped up headed off to another shop.

XL175 valve train finished and off to Australia.
06/16/2026

XL175 valve train finished and off to Australia.

CB750 K0 sandcast head 3 of 3. This one needed 3 time-sert spark plug repairs. All 3 heads finished and shipped back to ...
06/15/2026

CB750 K0 sandcast head 3 of 3. This one needed 3 time-sert spark plug repairs. All 3 heads finished and shipped back to the customer as part of a multi restoration project.

Took the GS1100E for a morning ride into the mountains and encountered a GS700E in the wild. What are the odds lol?
06/13/2026

Took the GS1100E for a morning ride into the mountains and encountered a GS700E in the wild. What are the odds lol?

CB750 K0 sandcast head 2 of 3. This one got all new valves and one time-sert spark plug hole repair.
06/12/2026

CB750 K0 sandcast head 2 of 3. This one got all new valves and one time-sert spark plug hole repair.

CB750 K0 sandcast head 1 of 3 finished. All threaded holes good in this one.
06/11/2026

CB750 K0 sandcast head 1 of 3 finished. All threaded holes good in this one.

3 sets KZ1000 OEM type iron guides wrapped up.
06/10/2026

3 sets KZ1000 OEM type iron guides wrapped up.

SOHC CB750 valve guide batch finished. 3 sets of them going in K0 sand cast heads.
06/09/2026

SOHC CB750 valve guide batch finished. 3 sets of them going in K0 sand cast heads.

1975 Z1 head build back to stock specs with new bronze guides and OEM type valves.
06/08/2026

1975 Z1 head build back to stock specs with new bronze guides and OEM type valves.

Address

8613 SE Strawberry Lane
Milwaukie, OR
97267

Telephone

(503) 939-7395

Website

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