CARBURETOR INSTALLATION
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IMPORTANT
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The carburetor on your engine comes preinstalled
from the factory; however, we suggest reading this section to
familiarize yourself with the steps to install the carburetor properly
should you need to remove it later for cleaning or maintenance.
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1) The carburetor is held in place using the pinch sleeve and
hex nut already installed in the
crankcase. Slide the base of
t h e c a r b u r e t o r i n t o t h e
crankcase, making sure that
the carburetor is straight. With
your thumb, push down on the
carburetor firmly so the base of
the carburetor fits completely
into the crankcase and the
carburetor o-ring seals the gap between the two parts. While holding
the carburetor in place, tighten the hex nut gently to draw the pinch
sleeve into place.
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WARNING
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Do not overtighten the hex nut. The hex nut only
needs to be tightened enough to keep the carburetor from turning
in the crankcase. Overtightening the hex nut can cause severe
damage to the base of the carburetor.
Please first familiarize yourself with the location of the idle stop
screw using the photo of the
carburetor on page 1. The idle
stop screw adjusts the closure
of the throttle barrel. We
recommend that the idle stop
screw be adjusted so that the
carburetor barrel stays open
about 1mm. Turning the idle
stop screw clockwise will cause
the barrel to stay open more. Turning the idle stop screw counter-
clockwise will allow the barrel to close more.
FUEL RECOMMENDATION
Fuel can make a big difference in the way your engine performs. For
the break-in period you should use a fuel
specifically
designed for R/C car engines
that contains no more
than 20% nitromethane and 10%-14% oil content. Once
the engine has been adequately broken in (about 45
minutes of run-time) you can switch to a fuel containing
up to, but no more than, 30% nitromethane and
10%-14% oil. We recommend using XTM Racing or
Trinity Monster Horsepower fuel.
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WARNING
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We do not recommend using fuels designed for R/C
airplane engine use. These fuels will cause the engine to overheat
and/or run erratically and severe damage to the engine will result.
GLOW PLUG RECOMMENDATION
The glow plug can make a big difference in
how your engine performs. For normal use,
we recommend using a "medium" or "cold"
heat-range glow plug intended specifically
for turbo head-style engines like the SH
Engines # 7 (P/N 147027) or the SH Engines # 8 (P/N 147028)
during the break-in process. After the break-in period you may want
to use a different heat-range glow plug. If the engine has a hard
time idling, you may want to use a hotter glow plug.
DO NOT use glow plugs designed for standard-head engines.
You MUST use a "turbo-style" glow plug designed for use
with turbo-style heads.
Using the wrong type of glow plug will cause the engine to run
erratically (or not run at all) and make it difficult to tune properly.
The wrong type of glow plug could also damage the engine.
WARNING ABOUT HYDRO-LOCKING
IDLE STOP SCREW
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EXHAUST SYSTEM
The SH .12 Turbo Modified On-Road engine does not include an
exhaust system. The exhaust system
is typically designed for the particular
car that you have, thus is usually
included in the model's kit. The
engine uses a standard 1/10th scale
slip-on header (held in place with a spring around the cylinder head).
The engine is designed to be used with a tuned pipe. To extract
optimal power and performance from your engine, we strongly
suggest the use of a high-quality 1/10th scale tuned pipe designed
for the powerband that you desire.
If at any time the engine becomes difficult to turn over -
STOP!
The
engine has become flooded and the excess fuel must be removed or
damage to the engine could occur. To remove the excess fuel from
the engine follow the steps listed below:
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Completely close the high speed needle valve (turn it clockwise)
until it GENTLY bottoms out.
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Remove the glow plug from the cylinder head.
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With a rag over the top of the engine, turn over the engine
using your starter box to clear the excess fuel from the cylinder.
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Check to make sure the glow plug has not been fouled, then
reinstall it. If the glow plug is fouled, replace it.
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Reset the high speed needle valve 3 turns out from bottom (turn
it counter-clockwise).
