On September 1st, 2010 08:47 a visitor came here looking for "instruction book for O.S 91HZ" and that person was viewing the following page:

Economy 4 LBS. Rock Tumbler - Science - Rock Tumblers
Our vibratory tumblers are ideal for wide variety of finishing operations such as deburring, descaling, polishing and sharp edge removal. Useful for m ...

If somehow that page does not seem relevant to you here are some products with the description/reviews matching your search term :

Editorial Review :

"This is the O.S. .91HZ F3C Competition Helicopter Engine. / / **Additional Technical Info Will Be Added When It Becomes Available.** / / FEATURES: Designed specifically for F3C aerobatic competition / Rectangular heat sink allows engine to be enclosed entirely inside / cooling shroud / 61-B carburetor with thermal insulator to block heat and a needle / valve control lever to control mixture from transmitter / Newly designed piston and crankshaft for reduced vibration and / improved torque stability over entire RPM range / Ball bearing supported crankshaft / One year limited warranty / / INCLUDES: O.S. .91 HZ F3C Competition Helicopter Engine with #8 glow plug, / needle control lever, extra 0.2mm head gasket, cap screws and / instruction manual / / REQUIRES: Fuel: 10%-30% nitromethane with at least 18% lubricant. Lubricants / may be either castor or synthetic oil or castor/synthetic blend. / Field Equipment: glow starter, fuel bulb, fuel can filter, fuel pump / hexagonal starting shaft (depending on brand of helicopter) / electric starter, battery and fuel tubing / Muffler- This is specific to the heli / / SPECS: Displacement: 0.91 cu in (14.95 cc) / Bore: 1.09"" (27.7mm) / Stroke: 0.98"" (24.8mm) / Output: 3.4 hp @ 15

Customer Review :

No review yet

Editorial Review :

These are the Pump Retaining Screws for the / O.S. Engines 91HZ-PS 3D Ring PD-08 Pump 61B-P Carb Engine (OSMG1976). / / FEATURES: Steel construction / / INCLUDES: Two 3x17.5mm phillips head pump retaining screws / Two 3mm lock nuts / / REQUIRES: Installation on the engine

Customer Review :

No review yet

Customer Review :

No review yet