CZ 250: history, specs, pictures

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CZ 250MX

It was hard to believe that CZ would foist a pile like this CZ250 enduro mid-1970s bummer off on the public, but they did. Seeing a chance to get a piece of the enduro market, they simply took a late '60s frame, a dated engine, electrics that would have trouble lighting-off an .049" model airplane engine and suspension components that did little more than hold up the bike.

It had rigid footpegs, a huge, bulbous tank, an exhaust that burned the leg, a speedo that didn't work and various bits and pieces that were attached with pure afterthought technology. The first time I fired up our test bike, the horn fell off on the ground. After I rode the bike 100 yards, the battery fell out and the wiring loom melted. In the next 20 minutes, the plug cap came off, the air filter fell off, the muffler cracked and wedged into the rear wheel, the gas cap leaked, both fuel lines cracked, a tire went flat and the throttle stuck wide open.

The feeble engine was also horribly over-geared, the kickstarter would stick on the frame, fork seals weeped like a garden hose and the motor mounts fell out. This mount signaled the beginning of the end for CZ sales in the United States, and rightfully so.

CZ 250
Also called 250 MotoCross Type 980.5, 250 Twin, 250-485
Production 1976 - 1981
Class All
single cylinder, two-stroke
Bore / Stroke 66.0mm x 72.0mm
Top Speed 64 mph (103 km/h)
Horsepower 12.74 HP (9.5 KW) @ 5000RPM
Fuel System carburetor. jikov 2933 se / jikov 2934 cd
Ignition magneto flywheel, voltage 6v
Transmission Gear box: 4-speed
Final Drive: chain
Suspension Front: telescopic oil shock
Rear: hydropneumatic spring unit
Brakes Front: expanding brake
Rear: expanding brake
Front Tire 3.00-18
Rear Tire 3.25-18
Wheelbase 55.91 inches (1420 mm)
Length 82.68 inches (2100 mm)
Width 33.07 inches (840 mm)
Height 42.91 inches (1090 mm)
Weight 219.36 pounds (99.5 Kg) (dry), 124.0 kg (wet)
Fuel Capacity 3.43 Gallon (13.00 Liters)
Manuals Service Manual

The CZ 250-485 was a single cylinder, two-stroke All motorcycle produced by CZ between 1976 and 1981. It could reach a top speed of 64 mph (103 km/h). Claimed horsepower was 12.74 HP (9.5 KW) @ 5000 RPM.

Engine[edit | edit source]

The engine was a air cooled single cylinder, two-stroke. A 66.0mm bore x 72.0mm stroke result in a displacement of just 246.0 cubic centimeters. Fuel was supplied via a port control.

Drive[edit | edit source]

The bike has a 4-speed transmission.

Chassis[edit | edit source]

It came with a 3.00-21 front tire and a 4.50-18 rear tire. Stopping was achieved via expanding brake in the front and a expanding brake in the rear. The front suspension was a telescopic oil shock while the rear was equipped with a hydropneumatic spring unit. The 250-485 was fitted with a 3.43 Gallon (13.00 Liters) fuel tank. The bike weighed just 219.36 pounds (99.5 Kg). The wheelbase was 55.91 inches (1420 mm) long.

In Media[edit | edit source]