User Manual

Glow plug failure is a common occurrence
when breaking in a new engine. To test
your plug, let the engine idle at a properly
adjusted low-speed needle setting with the
glow igniter attached. Then, remove the
igniter. If you hear no appreciable change in
engine rpm, then the plug is still good. If the
engine loads up and the rpm’s decrease, it’s
time to replace the glow plug.
Setting the Needle Valves
When adjusting the settings, always adjust
the needles in small increments, about
1/8 of a full turn at a time. Do not set
the engine too lean, as it shortens the
reliability of the engine.
After you have attained the correct needle
settings, the engine will have a strong-
sounding, high-pitched whine at full speed,
and a thin trail of blue/white smoke will
come from the exhaust.
An engine should not be run too lean; doing
so severely shortens the life of the engine.
When an engine is set too lean, it will run
very strong at first, but will soon begin to
sag and hesitate or stall when accelerating.
Tuning the Low-Speed Needle
The low-speed needle (also referred to as
the idle mixture or idle needle) should be
set after you’re satisfied with the high-speed
needle setting. After achieving the proper
operating temperature, reduce the engine
throttle to idle and pinch the fuel line with
your fingers close to the carb fuel inlet
nipple. If the engine dies immediately, the
lowspeed needle is set too lean. If the rpm’s
increase dramatically, the setting is too
rich. The ideal setting results in the rpm’s
increasing just a slight amount after pinching
the fuel line.
Idle Stop Adjustment
The last setting to be made is the idle
stop screw. Turning this screw clockwise
increases the idle speed; turning the screw
counterclockwise will make the engine idle at
a lower speed. Ideally, the engine should idle
just fast enough to be reliable in acceleration
and transition from idle to full speed.
Head Shims
Several head shims are added at the factory
to make the engine easier to start when
new. After break-in, you may remove all but
one of these shims to increase compression
and power.
Engine Maintenance
Periodic maintenance must be performed
in order to keep your engine in proper
operating condition. After each day of
running, it’s critical to use high quality
afterrun oil to protect the internals of the
engine and guard them against corrosion.
The methanol used in the fuel attracts
moisture that can cause corrosion
(particularly in the ball bearings). We
recommend Blue Thunder
™
Final Run
(DYN2255) as it’s specifically formulated to
protect your engine between uses. Follow
these steps after running your engine:
1) Empty all fuel from the tank and fuel lines.
2) Use Final Run fuel following the
instructions on the container.
3) Clean and inspect the engine and
fuel system.
Troubleshooting Guide
Problem
Engine won’t start
Engine starts, then dies
Engine starts and runs
for 1⁄2 tank, then quits
Warranty
Warranty Period
Exclusive Warranty- Horizon Hobby, Inc.,
(Horizon) warranties that the Products
purchased (the “Product”) will be free from
defects in materials and workmanship at the
date of purchase by the Purchaser
Limited Warranty
(a) This warranty is limited to the original
Purchaser (“Purchaser”) and is not
transferable. REPAIR OR REPLACEMENT AS
PROVIDED UNDER THIS WARRANTY IS THE
EXCLUSIVE REMEDY OF THE PURCHASER.
This warranty covers only those Products
purchased from an authorized Horizon
dealer. Third party transactions are not
covered by this warranty. Proof of purchase
is required for warranty claims. Further,
Horizon reserves the right to change or
modify this warranty without notice and
disclaims all other warranties, express or
implied.
(b) Limitations- HORIZON MAKES NO
WARRANTY OR REPRESENTATION,
EXPRESS OR IMPLIED, ABOUT NON-
INFRINGEMENT, MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE
OF THE PRODUCT. THE PURCHASER
ACKNOWLEDGES THAT THEY ALONE HAVE
DETERMINED THAT THE PRODUCT WILL
SUITABLY MEET THE REQUIREMENTS OF
THE PURCHASER’S INTENDED USE.
(c) Purchaser Remedy- Horizon’s sole
obligation hereunder shall be that Horizon
will, at its option, (i) repair or (ii) replace,
any Product determined by Horizon to be
defective. In the event of a defect, these are
the Purchaser’s exclusive remedies. Horizon
reserves the right to inspect any and all
equipment involved in a warranty claim.
Repair or replacement decisions are at the
sole discretion of Horizon. This warranty
does not cover cosmetic damage or damage
due to acts of God, accident, misuse,
Possible Cause/Solution
• Clogged fuel line
• Bad or improper glow
plug
• Glow igniter not
charged
• Engine flooded
• Pressure line blocked or
disconnected
• Bad glow plug
• High-speed needle too
lean
• Hole or tear in fuel line
• Bad glow plug or idle
speed set too low
• Overheated engine
(too lean)
• Improper needle
settings