1966 Allstate SR 250 Technical Analysis & Specification Breakdown
At the heart of the 1966 Allstate SR 250 allround motorcycle, Allstate pairs a 250 cc (15.3 cu in) air-cooled twin, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 16 HP (11.7 kW) at 5,800 rpm. With a specific output of 64 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the SR 250 measures 140.2 kg (309 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (8.76 kg per horsepower).
Within MotoLibrary's Allstate archive, this model family spans 5 indexed model years from 1964 to 1968, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
64 HP/L
Power-to-Weight
0.11 HP/kg (8.76 kg/HP)
Engine
Displacement250.0 ccm (15.26 cubic inches)
Engine TypeTwin, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power16.0 HP (11.7 kW)) @ 5800 RPM
Bore x Stroke45.0 x 78.0 mm (1.8 x 3.1 inches)
Fuel SystemCarburettor
CoolingAir
Performance
Top Speed80.0 km/h (49.7 mph)
Chassis
Front SuspensionTelescopic
Wheels & Brakes
Front BrakesExpanding brake (drum brake)
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight140.2 kg (309.0 pounds)
Power/Weight0.1142 HP/kg
Buying Checklist
Before You Compare This Bike
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
