HPI 111600 Nitro Star F3.5 V2 with Pullstart Trophy 3.5

HPI Racing brand HPI Nitro Star F3.5 V2 Engine with Pull Starter.

ABC construction, Aluminum piston with Brass liner that is Chrome plated
Slide valve 2-needle carburetor with composite body that reduces heat transfer and helps prevent vaporization of fuel
Race legal .21 cu in (3.5cc) displacement
22g lighter and 4mm taller than previous version
Two stage air filter with splash cover
Pull starter with one-way bearing encased in a 14mm hex for increased durability
Two year limited warranty beginning at date of purchase

Nitro Star F3.5 V2 Engine with Pull Starter, R5 Glow Plug, Air Filter and Instructions

Glow Fuel: Car blend with 20-25% nitro content, use 20% for break-in
Air filter oil

Displacement: .21 cu in (3.5cc)
Carburetor Settings:
High Speed Needle, 2-2/2 turns clockwise from flush
Idle Screw: Set throttle trim on transmitter so that throttle is in neutral position, turn screw counter-clockwise to reduce idle speed, or clockwise to increase idle speed. Set idle speed high enough to keep engine running smoothly, but not high enough to engage the clutch.
Low Speed Needle: No adjustment recommended. For increased performance, set after high-speed needle is adjusted. Turn needle in 1/8 turn increments for better bottom end throttle response.  Caution-never turn in more than 2 turns from flush. This will cause engine to run too lean and will result in damage.