Black Bull – Hand Start


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.

Thrust displayed 90 kg with propeller of 140 cm.


  • 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
  • Hand starter
  • 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 hand start complete with rubber mounts and airbox in carbon kg. 16,7