All engines 500cc SOHC 4-valve's unless otherwise noted.

MK1 -1978

-

MK5 -1985 revised 1987-89

- MK5 to have MAX upgrades 1987-89.
Below are the ............MK5 v......and......MAX v

MAX -1986 revised 1990

- New design that is 2 Kilo's liter in weight than a MK5, greater oil capacity to big end, redesigned oil pump, new rocker cover, newely designed cylinder head and crankcase.


Optional points ignition or magnetic trigger device at crankcase.


Conrod options - Alloy rods = INA bearings,
Steel rods = FAG roller bearings.


There was also a 350cc version of the MAX for grasstrack racing.

MAGNUM -1991

- All new design of upright engine with liter weight materials, redesigned oil circulation system, Plain shell big end and bearings, motoplat magneto, newly designed cylinder head w/revamped ports, different valves, redesigned camshaft. MAGNUM produces 10+ hp more than MK1.


Options included Carrillo-type conrods by Godden, and eccentric flywheels.


There was a proposed water-cooled Magnum that was to compete with the Jawa and GM longtrack engines, but never was produced.

Laydown MAX and MAGNUM

V1000

- A V-Twin speedway engine of 1000cc designed for sidecar racing. Two MK5's are used. Very, VERY powerful, especially on longer tracks. These can still be seen racing today in new zealand and north america.

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Telescopic forks - Traditional fork design and operation, stamped "GODDEN". Available in chrome(stiff) and nickel-plated(flex).

Leading Link - 1990 - Godden designed, stamped "GODDEN", available in chrome. This has a small shock absober to better dampen the front suspension.

Side port - Available in the 1960's and mid 1970's, stamped DGS, very popular for that time with JAP's and 2-valve JAWA's. Carb mounted at an angle to the riders right, air cleaner sticks out to right side.

Center-port - 1979-90's - Designed for 4-valve heads, allows carb to give straighter shot into intake. Carb and air cleaner hide under seat. Available in chrome(stiff) and nickle-plated(flex).

Piggly-Wiggly - A center-port design, but uses a bent single tube that curves to the riders left. Great handling diamond, very sought after. Available in chrome(stiff) and nickle-plated(flex).