Uploaded November 2025 | Updated September 2026, 4 days ago
Geoff Duke commissioned this special lightweight Manx for the 350 class. The oil in frame chassis was designed and produced by Ken Sprayson and short leading link front forks were used. The engine used a one piece forged crank shaft with external flywheel and plain bearing big end in alloy conrod. The special cylinder had a chrome plated bore and the cylinder head used dual Coil springs. Bill Lacey did the engine development work.This lightweight Manx was 50 lbs lighter than the normal one.
Geoff Duke commissioned this special lightweight Manx for the 350 class. The oil in frame chassis was designed and produced by Ken Sprayson and short leading link front forks were used. The engine used a one piece forged crank shaft with external flywheel and plain bearing big end in alloy conrod. The special cylinder had a chrome plated bore and the cylinder head used dual Coil springs. Bill Lacey did the engine development work.This lightweight Manx was 50 lbs lighter than the normal one.
