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
Vehicle requiring a rear exhaust .28 engine.
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.