HPI's Nitro Star S-25 Engine with pullstart features a slide valve carb with flat-head screwdriver adjustment on needle valve. ABC cylinder construction. Purple anodized head. Rear exhaust round port. Flowed and counterbalanced crankshaft. Machined pilot shaft crankshaft with collet preinstalled. Knive-edged billet aluminum connecting rod with dual bushings.
This package includes Nitro Star .25 (4.0) glow engine
Air filter and replacement element
Crankcase: 3.32" (from rear of case to front without shaft)
Height: 4.41" (from bottom of case to the top of the head)
Width: 1.81" (mount flange)
Mount Holes: 1.42" (measured from center to center width)
Mount holes: .82" (Between holes front and back)
RPM: Over 38,000 RPM
Horsepower: 2.5 @29000 RPM
Crankshaft diameter: 5mm (clutch bell area)
Crankshaft diameter: 6.7mm (threaded portion)
Crankshaft screw: 3 x 12mm caphead screw
Capacity: 4.09cc (.25) Requires: Glow fuel, glow starter. Vehicle requiring a rear exhaust .25 engine.
Tuned pipe. Manifold and air cleaner.