This is the HPI Nitro Star F4.1 Engine with Pull Start
used in the Savage X, HPIC1858.
FEATURES: Composite body slide valve carburetor with 7.5mm bore
Anodized purple oversize cooling head
SG (pilot) type crankshaft
Two year limited warranty
INCLUDES: HPI Nitro Star F4.1 Engine with Pull Start, instruction manual,
R5 cold glow plug, foam air cleaner assembly with four
zip ties, brass collet
REQUIRES: Fuel: Car blend with 20-25% nitro content
Misc Items: Fuel tubing and track equipment
SPECS: Specs such as horsepower, bore, stroke and RPM were not provided-
contact HPI for further infomation
High Speed Needle Setting: Turn clockwise in 1/8 turn increments
to lean fuel mixture. Do not exceed 2-1/2 turns from flush
Idle Adjustment: Adjust for about 0.04" (1mm) gap between slide valve
and carb body at bore opening
Low Speed Needle: No adjustment recommended
Displacement: .25 cu in (4.1cc)
Weight: 14.99oz (425g) without air filter
Distance Between Mounting Holes Same Side: 0.83" (21mm)
Distance Between Mounting Holes Opposite Side: 1.4" (36.5mm)
Height/Bottom Mounting Flanges to Top of Cylinder Head: 3.8" (96mm)
Height/Bottom of Crankcase to Top of Cylinder Head: 4.3" (110mm)
Length from Pull Starter to End of Crankshaft: 4.4" (113mm)
Length from Pull Starter to Front Bearing: 3.3" (84.3mm)
Length from Center of Crankcase to End of Crankshaft: 2.9" (75mm)
Diameter of Exhaust Outlet: 0.59" (15mm)
Diameter of Carburetor Opening: 0.53" (13.5mm)
Diameter of Carburetor Bore: 0.29" (7.5mm)
