This is the Pro .28 High-Performance Racing Engine from Associated. FEATURES: Direct replacement engine for the Associated RC8RS buggy Associated Pro Start (ASCP5262) compatible backplate Slide valve carburetor SG crankshaft Ten fin heatsink INCLUDES: Associated Pro .28 Engine with slide valve carburetor, pinch bolt, air filter assembly and instruction manual REQUIRES: Fuel: 2-cycle glow fuel with 10%-15% nitromethane and at least 16% oil content Glow Plug: Medium to hot heat range suitable for off-road use Track equipment SPECS: Displacement: .28cu in (4.6cc) Specs such as Bore, Stroke and Horsepower not provided by manufacturer Distance between Mounting Hole Centers Same Side: 0.83" (21mm) Distance between Mounting Holes Opposite Side: 1.5" (37.5mm) Width at Mounting Tabs: 1.8" (45.5mm) Width below Mounting Tabs: 1.3" (31.2mm) Height/bottom of Mounting Tabs to top of Cylinder Head: 3.7" (94.5mm) Height/bottom of Crankcase to top of Cylinder Head: 4.2" (106mm) Distance from Backplate to Front Bearing: 2.9" (74mm) Distance from Backplate to End of Crankshaft: 4.1" (104mm) Carburetor Settings; High Speed Needle: Turn clockwise until it bottoms out, then turn counterclockwise 2-3/4 turns Low Speed Needle: Turn clockwise until it bottoms out, then turn counnterclockwise 6-1/4 turns Idle Speed Screw: Turn until opening inside throttle valve is .030" (0.7mm) COMMENTS: Will not fit the Associated Nitro TC3 or GT2. AssociatedPart ASC25352