Black Bull – Hand Start

235 c.c.OF PURE POWER

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
STRUCTURAL FEATURES
  • 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