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

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

NEEDS:
Shine Fuel: Car blend with 20-25% nitro material, utilize 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 remains in
neutral position, turn screw counter-clockwise to decrease idle
speed, or clockwise to increase idle speed. Set idle speed high
enough to keep engine running efficiently, however not high enough to
engage the clutch.
    Low Speed Needle: No adjustment suggested. For increased
performance, set after high-speed needle is changed. 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
trigger engine to run too lean and will result in damage.