1969 Greeves Challenger MX6 250 COURTESY OF DEAN NEWTON

The MX Greeves motocross series began in 1964 with the 24 MX1, which used a new concept devised by Bert Greeves. The motor was derived from the Villiers, but with an aluminum cylinder, while the frame was a modified version of the MDS model with plastic mudguards. The 1965 MX2 differed only in detail.

Bizarre Sequence The 250 MX5 was joined by the 360cc 36 MX4, and followed in 1968 by the 250 MX4 with conical full-hub brake drums. And that, it seemed, was the end of this famous series, until the appearance of this ultimate 24MX6. The MX4 and MX6 Challengers were the last to use the renowned frame, with its imposing cast-aluminum front member, a feature of the Greeves since 1953. The MX6 also featured the famous Greeves leading-link front fork, even though a telescopic unit was available as an option. The Challenger series was successful and sold extremely well, particularly in the US where the 360cc was popular. Sport highlights included a third place for Dave Bickers in the 1965 World Championship, behind the CZs of Arbekov and Joel Robert. The Challenger also brought Greeves its sixth British national title.

SPECIFICATIONS
Engine: 246cc (70?64mm) air-cooled single-cylinder
Power Rating: 27 hp @ 5,600 rpm , two-stroke; ports controlled by piston skirt.  Fuel System: 32mm carburetor ; Transmission: 4-speed, chain final drive; Suspension: leading-links (front); swing arm (rear) Brakes: 6 inch drum (front & rear) Wheels: 21 inch (front); 18 inch (rear) Weight: 225 lb
Rarely seen, the 250 Challenger MX6 was the last of the Greeves line with the traditional cast- aluminum beam frame.

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