HPI Nitro Star F3.5 V2 Engine, 3.5Cc, Slide Carburettor, And Rear Ex

This is the HPI Nitro Star F3.5 V2 Engine with Pull Starter.

FEATURES:
ABC building, "A"luminum piston with "B"rass liner that is
    "C"hrome plated
Slide valve 2-needle carburetor with composite body that lowers
    heat transfer and assists prevent vaporization of fuel
Race legal .21 cu in (3.5cc) displacement
22g lighter and 4mm taller than previous variation
2 stage air filter with splash cover
Pull starter with one-way bearing framed in a 14mm hex for increased
    sturdiness
2 year limited guarantee beginning at date of purchase

INCLUDES:
Nitro Star F3.5 V2 Engine with Pull Starter, R5 Radiance Plug, Air Filter
    and Guidelines

NEEDS:
Shine Fuel: Vehicle blend with 20-25% nitro content, use 20% for break-
    in
Air filter oil

SPECIFICATIONS:
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 minimize 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 change advised. For increased
efficiency, set after high-speed needle is changed. Turn needle
in 1/8 turn increments for much better bottom end throttle response.
Caution-never turn in more than 2 turns from flush. This will
trigger engine to run too lean and will result in damage.