Engine details
Prestwich Model Boats
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EMAIL  marlesd@aol.com for a price and delivery quote

CMB 21 LS.21 longstroke greenhead.	Technical details
	Displacement (cc) 3.48 Bore (mm) 16.30 Stroke  (mm) 16.70
	Cooling Green water-cooled head Carb Barrel type carb 8.5mm bore . Cylinder 1-Exhaust, 4-transfers, 1-boost, 2 piston bypass ports. Induction  Drum valve   Glow plug Cone plugsl  (TURBO)       Head shims (mm) 0.1 Extra CMB Multi-Exhaust-System 2 ports + special tapered piston and top Crankshaft 13 mm  Main bearings  1 x 6000, 1 x 607 Recommended fuel 20% nitro 17% oil, 2% castor, the rest synthetic. Recommended pipe length mm for gear drive. 185mm