This is HPI"s Nitro Star K4.6 .28 size Engine With Pullstart. This is the standard engine for the Savage SS .28 monster truck kit. FEATURES: Composite construction slide valve, 3 needle carb with hand adjustable high speed needle (the stock carb settings are made flush for convenient "back to factory settings") 8 port chrome plated brass sleeve True ABC cylinder construction Purple anodized machined aluminum heat sink head Rear exhaust round port Cast aluminum crankcase features heatsink fins Machined pilot shaft crankshaft with collet preinstalled Knife-edge billet aluminum connecting rod with dual bushings. Dual stage air filter dramatically reduces intake restriction as it smoothes and straightens air flow INCLUDES: Nitro Star .28 (4.6) glow engine Glow Plug - HPI R5 cold plug (HPIG1504 for a replacement) Dual Stage Air Filter (HPIC7198 for replacement) Instructions and parts break down SPECS: Crankcase: 3.29" (83.5mm) (from rear of case to front without shaft) Height: 4.40" (111mm) (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: Max 39,000 RPM Horsepower: 2.9 @ 35,000 RPM Crankshaft diameter: 5mm (clutch bell area) Crankshaft diameter: 6.7mm (threaded portion) Crankshaft screw: 3 x 12mm caphead screw Capacity: 4.60cc (.28 ci) REQUIRES: Glow fuel Glow starter Vehicle requiring a rear exhaust .28 engine. Tuned pipe Manifold COMMENTS: This engine can be converted from recoil to Roto Start with HPIP7126. If the modeler only wants a recoil backplate, they can purchase HPIG7127. kpm02/17/2000 ir/jxs