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good with bolt upgrade! Never get loose!For sell because I bought new engine!U can come here to Bergen and see!Align .90 potte er laget for OS .91 SZ og HZ motorene samt aligns versjoner av de. Potten gir godt med effekt og passer veldig bra til 3D type flyving.Apply to 90 size helicopters, according to the strength character of 90 engine to design, features much increase the horsepower, fuel-saving, low noise, and the highest air exhaust volume on the market.Great design and test to three spaces: expansion chamber, accelerated section, silencer chamber, high efficiency and the quick respond of medium speed and high speed, great for 3D flying.Use for O.S 91SR/HZ & ALIGN 91H/HP engine. Inneholder:Pressure nipple x1Exhaust guide x1(F13.5xF18.5x79.75mm)Spacer x2Collar screw x2(M4x40mm)Spring Washer x2Strap x 1(100mm)More...