A.S.E.C.C. Engine Data


Villiers Technical Information
4 Stroke Engines

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Villiers Technical Information used by permission and belong to their respective owners.
Courtesy of Daniel & Steve Kitto.
For More Villiers information please visit
Daniel & Steve Kitto`s Kitto`s Collection pages.

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Mark 10
Bore 50mm
Stroke 50mm
Capacity 98cc
BHP Mk 10 1.0 hp @ 2000rpm
BHP Mk 10 HS 1.6 hp @ 3400rpm
Valve Tappet Clearance
Intake  Min .006in/Max .012in
Exhaust Min .006in/Max .012in
Points Clearance .012in / .016in


Mark 12
Bore 55mm
Stroke 50mm
Capacity 120cc
BHP Mk 12 1.2 hp @ 2000rpm
BHP Mk 12 HS 1.95 hp @ 3400rpm
Valve Tappet Clearance
Intake  Min .006in/Max .012in
Exhaust Min .006in/Max .012in
Points Clearance .012in / .016in


Mark 15
Bore 63mm
Stroke 47mm
Capacity 147cc
BHP Mk 15 2.3 hp @ 3000rpm
Valve Tappet Clearance
Intake Min .002in/Max .004in
Exhaust Min .005in/Max .007in
Points Clearance .012in / .015in


Mark 20
Bore 63mm
Stroke 66.7mm
Capacity 206.5cc
BHP Mk 20 2.5 hp @ 2500rpm
BHP Mk 20 HS 2.7 hp @ 3000rpm
Valve Tappet Clearance
Intake  Min .006in/Max .010in
Exhaust Min .006in/Max .010in
Points Clearance .012in / .016in


Mark 25
Bore 70mm
Stroke 66.7mm
Capacity 256.5cc
BHP Mk 25 3.0 hp @ 2500rpm
BHP Mk 25 HS 3.4 hp @ 3000rpm
Valve Tappet Clearance
Intake Min .006in/Max .010in
Exhaust Min .006in/Max .010in
Points Clearance .012in / .016in


Villiers Engineering Co. was established in1898 and is still operating in Wolverhampton, England, where they were founded. Many Australian engines were made in Ballaarat, Victoria. They made engines for motorcycles, lawn mowers and various stationary engines.



Timing a Villiers Engine

The magneto is timed so that the contact breaker points commence to open when the piston is 3/16" before top dead center. A rough check on the position may be made without removing the cylinder head, by observing the position of the keyway on the driving shaft when the points are just opening. The keyway should then be 27deg before top. Accurate timing can only be done with the piston visible.


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Last modified:  05 / 21 / 2009