Black Bull

Engine developed for competitions, bi-place PPG, and trikes.

BLACK BULL is studied and projected in order to satisfy all pilots need expecially in terms of light weight, power, and maximum reliability.

TECHNICAL FEATURES

• Single cylinder air cooled
• Two stroke
• Bore 70 mm
• Stroke 61 mm
• Total displacement 235 cc
• Compression ratio 10.5:1
• Fuel delivery to the crankcase: six blade reed-valve system connected to the crankcase
• Diaphragm carburetor Tryton
• Reducer with Poly V belt available in 1:3.0
• Continuous operating temperature 180°C, max. temperature 220°C measured under spark plug
• Engine mounting: by 5 shock absorbing rubber mounts
• Propeller rotation: counterclockwise
• Maximum RPM 8000 RPM
• Spark plug NGK BR8ES
• Fuel mixture 2.5% with synthetic oil, suggested brands: Malossi 7.1 – Shell Racing M – Wladoil K 2T – Elf 2 T moto

• Electric starter (battery recharge available as accessory)
• Crankcases molten in G-Al Si 9 UNI 3051 alloy subsequently treated and anodized against sea salt
• Six port distribution system, and exhaust with booster
• Cylinder in alloy with Nikasil coating
• Piston with 2 piston rings
• Head in alloy with high percentage of silicon and hemispheric combustion chamber, with squish
• Drive shaft in 18 Ni Cr Mo5 with 5 thermic treatments on every component
• Connecting rod in copper plated steel 18 Ni Cr Mo 5 joined to the drive shaft through very precise high speed silver-plated roller bearings
• Roller bearings fit for high speed class C3
• Seal ring in Viton with very high resistance and long duration
• Engine weight: Black Bull electric start complete with airbox in carbon and rubber mounts.17.4 Kg
• Pull Start 16.7 Kg
• All options are sent with a 3.0 Reduction unless you need something else