OS Max OSM13911

This is the O.S. Max Speed Tuned.21 VZ-B V-Spec2 Off-Road 1/8 scale Racing Engine with Aluminum Heat Sink Head. Ideal for Mugens, Infernos, and hybrid trucks. ****** Because of the expressed racing nature of this engine, ****** ****** it is NOT covered by the O.S. 2 Year Warranty ****** ****** per page 8 of manual. ****** V-shaped aluminum head with eighteen machined holes for lighter weight and more efficient cooling Hardened, chrome-plated, 4-port, cylinder and liner for high durability and long life Specially coated silicone filled crankshaft with precision ceramic bearing that greatly reduces friction, plus a Tungsten weight for for added balance Machined piston features parallel rings that trap fuel oils and use them as a seal to enhance compression and boost power Reshaped crankcase core ensures smoother air flow and more consistent performance Slide Valve Carb with 7mm, 6.5mm and 6mm Carb restrictors with red anodized finish allow tuning to specific track conditions, Low- end Needle adjusts from side to side for maximum adjustment ease O.S. Max Speed Tuned.21 VZ-B V-Spec2 engine, 21JS carburetor, P3 glow plug, 7, 6.5 and 6mm carb restrictors, manual, exhaust gasket and dust cap set #203 Air Cleaner Assembly, OSMG2360 Exhaust System: T-2060SC WN tuned silencer (OSMG2938) developed specifically for this engine Fuel: 10-30% nitro content, 20% recommended for break-in Most of the fuels we carry meet or exceed the lubricant content required for optimum performance and maximum engine life. In the past, the conventional lubricant content used in fuel was 18%. But with new advanced technologies, fuels like Red Alert and O'Donnell for example, have a better quality of lubricants even though the percentages of lubricant content are lower. These high-tech lubricants provide exceptional cooling and protection. Practical RPM Range: 3,000-40,000 Output: 2.5 ps @ 34,000 rpm Displacement: 0.211 cu in (3.46cc) Bore: 0.654in (16.6mm) Stroke: 0.630in (16.0mm) Weight w/o Muffler: 12.3 oz (349g) Height from crankcase bottom to top of cylinder head: 110.6mm (4.4") Height/crankshaft center to top of cylinder head: 95.3mm (3.8") Width including mounting ears: 45mm (1.8") Width not including mounting ears: 30.8mm (1.2") Width between mounting holes same side: 21mm (.83") Width between mounting holes opposite side: 37mm (1.5") Cylinder head diameter: 57.2mm (2.3") Length of exposed pilot shaft/crankshaft: 29.6mm (1.17") Internal thread size at end of crankshaft: 3mm Turbo glow plugs do not require a copper gasket. With the carb restrictors, the driver can select either low fuel consumption or high power, allowing a wide range of engine control. Usage is as follows: -6mm: Suitable for technical (narrow) and bumpy course when less fuel consumption is more important. -6.5mm: Suitable for high-speed and flat courses that require power. -7mm: Supplied with engine. Suitable for technical and bumpy courses and when less fuel consumption is more important. NEEDLE SETTINGS: These are pre-set from the factory and require little or no adjustment Needle Valve: 2.5 turns open from fully closed position Metering Needle - Rotate until slotted head is extruded by 0.5mm into ball link body Mixture Control Valve - Rotate until slotted head is flush with ball link body jxs 01/05/09 ir/jxs &