My original cylinder head invention and early Beare prototypes have of recent years been undergoing much redesign & revision, I plan to post compete and independently validated performance & economy figures, as soon as the prototypes based on my latest inventions have undergone mandatory official trials and testing.

Meanwhile, please see below the results of unofficial tests of my early development Beare prototype carried out in 1995.

Thank You.

Fuel consumption early testing 1995

YAMAHA TT 500cc

Test by Malcolm Beare, Elliot Munro, Grant Guy, July 1995

The dyno used for testing the Beare Headed early prototype, was an old motorbike dyno with the rear wheel driving a large fan with a speed readout dial. The throttle was opened enough to maintain the designated speed. So the power outputs were identical.

The Beare Six Stroke Cylinder Head was in this instance designed to as closely match the Standard Yamaha four stroke as closely as possible, it terms of compression ratio, valve timing, port sizes. This version was not a fully optimised Beare Six Stroke Head, much more port area is available and compression ratio could be higher.

The Beare Dual Opposed Piston Six Stroke Engine delivered full torque happily at lower revs, (1000) lower than the factory Yamaha four stroke in 5th gear. The Factory Yamaha four stroke would pull 4000 RPM at full throttle, whilst the Beare Head Six Stroke equaled and bettered the torque figures at 3500rpm.

Both, The factory Yamaha 500, and the Beare Dual Piston Engine, ran the same gearing, same carburetor etc.

Fuel was gravity fed directly to the carburetors of both machines from a long clear tube with two level marks to indicate 100cc, the test and result were scrutinized and verified by Elliot & Grant.

Read about the technical aspects of the Six Stroke Engine below