SH Engines PT12R01 User manual

Thank you for choosing an SH .12 Pro Rear-Exhaust engine. All SH
engines are designed for high power output and easy handling. The
SH .12 Pro Rear-Exhaust engines are designed specifically for 1/10th
scale trucks and sedans, and feature dual ball bearing-supported
crankshaft, ABC piston and sleeve, two-needle carburetor, pull-start
assembly (where applicable), heat-dissipating cylinder head and
superb attention to detail and quality. All SH engines are manufactured
using CNC manufacturing equipment to ensure every engine is
produced to the exacting quality that you have come to expect from
an engine of this caliber.
SH engines will consistently give you dependable performance and
reliability and will be a source of satisfaction and pleasure if you
follow these instructions as to the engine’s proper and safe use.
You alone are responsible for the safe operation of your engine, so
act sensibly and with care at all times. This engine is not a toy. It is
a precision-built machine whose power is capable of causing
serious injury to yourself and others if abused, misused or if you fail
to observe proper safety precautions while using it.
☞Never use any fuel in your engine other than glow fuels
specifically designed for use in model car/buggy engines. Use of
any other types of fuel can cause severe damage to the engine and/or
personal injury. NEVER USE GASOLINE OR DIESEL FUEL!
☞Never operate your model on any public streets. This could
cause traffic accidents, personal injury or property damage.
☞Glow fuel engines emit exhaust vapors that are poisonous and
can be dangerous to your health. It is important that you operate
your engine in a very well-ventilated area, preferably outdoors.
☞Before starting the engine, make sure that the throttle trim is set
to the idle position. Starting the engine at any setting above idle can
cause the model to lurch out of your hands.
☞When the engine is running, there are certain parts that rotate
at high speeds. Be careful not to touch the drive shafts, gears, clutch
assembly or any other moving parts. Serious injury could result.
☞It is normal for the engine to get very hot during operation,
especially the cylinder head and exhaust system. Never touch
the engine or exhaust system while they are hot.
☞Model car engines produce vibration when they are running.
It is important to periodically check the engine mounting screws,
exhaust mounting screws and other assemblies to ensure they
are tight. Running the engine with the engine mounting screws
loose can lead to severe engine and/or chassis damage.
INTRODUCTION
BECOMING FAMILIAR WITH YOUR ENGINE
Please read through this instruction guide in its entirety to familiarize
yourself with the features and operation of your new SH .12 Pro
Rear-Exhaust engine. Start by using the photo below to familiarize
yourself with the major components of your new engine.
1
CAUTION - PLEASE READ!!
SH .12 PRO OPERATING INSTRUCTIONS FOR
PT12R01, PT12R01S, PT12R01A & PT12R02AS ENGINES
Due to running manufacturing changes
and improvements, your engine may
differ slightly from that shown.
PT12R02AS Engine
Shown. Other Engines
Will Appear Differently
These instructions are written for four types of engines.
Carburetor settings, fuel and glow plug recommendations,
break-in procedures, carburetor tuning, etc are the same
for all four engines, unless otherwise noted.
SH .12 PRO ENGINE SPECIFICATIONS
Disp Bore Stroke RPM Power Weight
PT12R01 2.1cc 13.85mm 14mm 32,000 1.1@32,000 206g
PT12R01S 2.1cc 13.85mm 14mm 32,000 1.1@32,000 208g
PT12R01A 2.1cc 13.85mm 14mm 30,000 1.0@30,000 270g
PT12R02AS 2.1cc 13.85mm 14mm 30,000 1.0@30,000 266g

CARBURETOR INSTALLATION
Please first familiarize yourself with the location of the idle stop
screw using the photo of your
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.
✦✦
✦✦
✦WARNING✦✦
✦✦
✦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
"hot" heat-range glow plug intended
specifically for performance engines like
the SH Engines # 4 (P/N 147024) or the SH Engines # 3 (P/N 147023)
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 will definately want to use a hotter glow plug, like the
SH Engines # 3. Use a colder heat-range glow plug if using 30% fuel.
✦✦
✦✦
✦WARNING✦✦
✦✦
✦Do not use glow plugs with an "idle bar." Using
the wrong type of glow plug will cause the engine to run erratically
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
2
EXHAUST SYSTEM
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 and/or pull-starter could occur. To remove
the excess fuel from the engine follow the steps listed below:
●Completely close the high speed needle valve (turn it clockwise)
until it GENTLY bottoms out.
●Remove the glow plug from the cylinder head.
●With a rag over the top of the engine, turn over the engine
using your starter box or by pulling rapidly on the pull-start cord to
clear the excess fuel from the cylinder.
●Check to make sure the glow plug has not been fouled, then
reinstall it. If the glow plug is fouled, replace it.
●Reset the high speed needle valve 3 turns out from bottom (turn
it counter-clockwise).
✦✦
✦✦
✦IMPORTANT✦✦
✦✦
✦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.
❑1) The carburetor is held in place using the pinch sleeve and
hex nut already installed in the
crankcase. Slide the base of
the carburetor into the
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.
✦✦
✦✦
✦WARNING✦✦
✦✦
✦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.
Your SH .12 Pro Rear-Exhaust 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).
Your 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 your engine is not equipped with a pull-starter, we recommend
using a starter box to start your engine. The XTM Racing Starter
Box (P/N 146053) is a good choice.
The following details the starting procedure for your engine.
❑1) If your engine does not feature a pull-starter, it's not necessary
to prime your engine. Fuel will be drawn into the carburetor when
you turn the engine's crankshaft, using your starter box. If your
engine features a pull-starter, open the throttle completely, cover the
tip of the tuned pipe with your finger, and pull the pull-start cord
several times to draw fuel into the carburetor. Over-priming the engine
can cause the engine to "hydro-lock" or flood. (See warning on page
2). Never try to start the engine if it is hydro-locked. This could
cause serious damage to the engine and/or pull-starter.
❑2) The engine is started by connecting the power to the glow
plug then pulling on the pull-start cord (or using your starter box).
For pull-start engines you should pull the cord in short, quick,
successive pulls until the engine starts. Once the engine has started,
release the pull-start cord.
✦✦
✦✦
✦IMPORTANT✦ Never pull the pull-start cord out to its maximum
length. This may damage the pull-start assembly. Always use
short, rapid pulls.
STARTING PROCEDURE
BREAK-IN PROCEDURE
Your SH .12 Pro Rear-Exhaust engine is an ABC engine. The cylinder
sleeve is tapered at the top, causing resistance when the piston
moves through the top of the stroke. This is normal. When the
engine heats up to operating temperature, this resistance will
decrease and the proper clearance will be achieved. The break-in
procedure will guide you through the steps necessary to properly
break in your new engine. Please follow the steps closely.
☞The break-in process allows the engine parts to perfectly fit to
each other and properly protect each part from premature wear. The
engine should be broken in using a good quality R/C car fuel
that contains no more than 20% nitromethane.
❑1) Turn the high speed needle valve out 3 full turns from the fully
closed position and follow the starting procedure in the previous
section to prime and prepare the engine for starting. Do not adjust
the low speed needle valve.
❑2) Open the throttle barrel just above the idle position and
attach a glow starter to the glow plug. Start the engine following the
guidelines in step 2 in the previous procedure.
❑3) Once the engine starts, allow it to run for about 10 seconds
without giving it throttle. This will allow the engine to warm up. At
this point the engine should be running very "rich" and the engine will
also sound like it's running rough.
❑4) After the engine has been running for about 10 seconds,
remove the glow starter from the glow plug. Advance the throttle in
short, quick bursts and drive the car around for about 2-3 minutes. If
the engine is running rich enough, you should notice smoke coming
from the tuned pipe and the engine should sound like it’s running
very rough. Also, the car will barely be moving. This is what you
want for now. If there is not smoke coming from the tuned pipe,
richen the high speed needle valve. After 2-3 minutes stop the
engine by pinching the fuel line to the carburetor.
❑5) Let the engine cool for approximately 10 minutes, then restart
it. Set the high speed needle valve mixture to a slightly leaner
setting, about 1/8 turn more in. Repeat step 4 above, then stop the
engine and let it cool for approximately 10 minutes.
❑6) Repeat step 5, while leaning the high speed needle valve slightly
more each time. In all, you should run the engine a total of about 45
minutes. After 45 minutes of run-time the engine will be broken in.
Run the engine with the high speed needle valve set slightly rich,
but lean enough to power the car. At this point the engine should
hold a good setting on the high speed needle valve and you can
begin to fine tune the needle valve settings to increase performance.
✦✦
✦✦
✦IMPORTANT✦✦
✦✦
✦It is of the utmost importance that the engine
never be leaned out too much. When running the engine, you should
always be able to see a trail of smoke coming from the tuned pipe.
If you can’t, stop the engine immediately and richen the high speed
needle valve. You should also make sure there is plenty of air
flowing over the cylinder head to keep the engine from overheating.
3
HIGH & LOW SPEED NEEDLE VALVES
HIGH SPEED NEEDLE VALVE
The high speed needle valve is used to meter the air/fuel mixture at
full throttle. Using a flat blade screwdriver,
turn the needle clockwise to lean the mixture
or turn the needle counter-clockwise to
richen the mixture. When you start the
engine for the very first time, the needle
valve should be turned in completely, then backed out 3 full turns.
This is the factory break-in setting.
LOW SPEED NEEDLE VALVE
The low speed needle valve meters the air/fuel mixture at idle and
during transition from idle to full throttle.
Turn the low speed needle clockwise to
lean the mixture. Turn it counter-clockwise
to richen the mixture. The low speed
needle valve is preset from the factory, but
minor adjustments may need to be made to suit your application:
fuel used, glow plug and environment all contribute to the setting.
To reset the low speed needle valve back to the factory setting,
follow these simple steps:
●Open the carburetor barrel completely.
●While holding the barrel open with your finger, use a flat blade
screwdriver to turn the low speed needle valve clockwise until it stops.
From this point, turn the low speed needle valve counter-clockwise
2.5 turns. This is the factory break-in setting.

Now that your engine has been broken in, you can set the high and
low speed needle valves for optimum engine performance.
✦✦
✦✦
✦WARNING✦✦
✦✦
✦Be careful never to lean out the engine too much.
Remember that the lubricants for your engine are suspended in
the fuel. If you lean out the fuel mixture too much you will also be
lowering the amount of lubricant entering your engine. Less lubricant
means more chance of your engine overheating and possible
engine failure.
SETTING THE HIGH SPEED NEEDLE VALVE
❑1) Start the engine and remove the glow starter from the glow
plug. Allow the engine to warm up for about 10 seconds.
❑2) After the engine has warmed up, drive the car as you normally
would. If the engine seems to be running rich, lean the needle valve
about 1/16 of a turn at a time until the desired setting is achieved.
Always make sure you run the engine slightly rich - you want to be
able to see a slight smoke trail at all times.
☞To get more power from your engine you can use fuels
containing up to 30% nitromethane. We must caution you, though,
that once you run the engine with increased nitro you may not get
satisfactory results if you decide to go back to a lower nitro content.
We also suggest using a colder heat-range glow plug like the SH
Engines # 5 (P/N 147025).
SETTING THE LOW SPEED NEEDLE VALVE
❑1) Start the engine and lean out the high speed needle valve as
per the previous steps. Close the throttle until the engine slows
down enough so that the clutch is disengaged and the wheels don’t
turn when the car is lifted from the ground. Allow the engine to idle
for about 10-15 seconds.
☞If necessary, adjust the idle stop screw to raise or lower the
idle speed.
❑2) While holding the car off the ground quickly open the throttle
in a short burst. If the engine just stops running as soon as the
throttle is advanced, the low speed needle valve is too lean and the
engine is not getting enough fuel. With the engine stopped, richen
the needle valve about 1/16 of a turn (counterclockwise).
❑3) Restart the engine and repeat step 2 until the engine will
transition smoothly and quickly. Very slight hesitation in the
transition is normal.
❑4) If you quickly advance the throttle and the engine seems to
be very rich during transition (i.e., lots of smoke coming from the
tuned pipe and very rough sounding), the low speed needle valve is
too rich and the engine is getting too much fuel. With the engine
stopped, lean the needle valve about 1/16 of a turn (clockwise).
❑5) Restart the engine and repeat step 4 until the engine will
transition smoothly and quickly. Very slight hesitation in the
transition is normal.
To keep your engine operating at peak performance there are some
basic maintenance procedures that need to be performed on the
engine on a regular basis:
●After you are finished running the engine for the day, pinch the
fuel line to stop the engine. This will allow the engine to burn any
excess fuel out of the crankcase.
●Remove the air filter element and wash it thoroughly in warm
water and a small amount of liquid detergent. After it's clean, allow
it to dry, then reoil it and install it back into the air filter housing.
Never run your engine without an air filter installed.
●Remove the glow plug from the engine and squirt several drops of
high-quality after-run oil into the glow plug hole. Pull the pull-start cord
several times to distribute the oil throughout the engine, then reinstall
the glow plug. The after-run oil will prevent the inside of the engine
(especially the crankshaft bearings) from rusting.
●Clean the outside of the engine using a heavy brush and nitro car
cleaner, then dry the engine, using a rag or compressed air.
●Check the engine's cylinder head bolts and backplate screws
after each day of use to ensure that they're tight. This will prevent
air leaks from causing erratic engine performance.
FINE TUNING YOUR ENGINE
MAINTAINING YOUR ENGINE
❑6) Now drive the car as you normally would for a while to get a
feel for how the engine reacts to throttle. Now that you know the
proper way to tune the engine, you can make slight adjustments to
the needle valves until you are satisfied with the performance.
✦✦
✦✦
✦IMPORTANT✦✦
✦✦
✦We suggest using a temp gun to frequently check
the operating temperature of your engine during use. The optimal
operating temperature is between 210º and 240º. Do not let the
engine exceed 270º. If the engine exceeds 270º, stop the engine
immediately and retune the carburetor to a richer setting.
4
Important information about returning your
SH engine for warranty service can be found
on the separate Parts List and Troubleshooting
Guide packaged with these operating
instructions.
SH engines are distributed exclusively in the U.S.A. by
Global Hobby Distributors
18480 Bandilier Circle, Fountain Valley, CA 92708
All contents copyright © 2004, Global Hobby Distributors
Version V1.0 November 2004

TE011 (147512) Collet for Flywheel
TE013 (147576) Hex Nut for CarburetorRetaining Bolt
TE014 (147577) Lock Washer for Carburetor Retaining Bolt
TE015 (147578) Front Ball Bearing
TE020B (147590) Exhaust Gasket
TE032 (147616) Thrust Washer - Regular Crank Only
TE1201 (147591) Cylinder Head Screw Set (4)
TE1202G (147646) Cylinder Head
TE1203 (147617) Head Button
TE1204A (147594) Head Gasket - .10mm
TE1204B (147595) Head Gasket - .20mm
TE1205D (147618) Piston & Sleeve Set
TE1206 (147597) Wrist Pin
TE1207B (147619) Wrist Pin Clips (2)
TE1209A (147620) Carburetor Assembly - Rotary
TE1210 (147599) Carburetor O-Ring
TE1211B (147600) Crankcase
TE1217E (147621) Crankshaft - Regular, Non Pull-Start
TE1217F (147643) Crankshaft - Regular, Pull-Start
TE1217G (147644) Crankshaft - SG, Non Pull-Start
TE1217I (147645) Crankshaft - SG, Pull-Start
TE1219 (147602) O-Ring for Backplate
TE1220 (147603) Backplate - Non Pull-Start
TE1221 (147604) Screw Set for Backplate (4)
TE12901 (147645) Idle Stop Screw - Rotary Carb
TE12902 (147606) Idle Stop Screw Spring
TE12903A (147622) Carburetor Body - Rotary Carb
TE12904 (147623) Dust Boot - Rotary Carb
TE12905 (147624) Throttle Barrel - Rotary Carb
TE12906 (147607) O-Ring for Low Speed Needle Valve
TE12907 (147625) Low Speed Needle Valve - Rotary Carb
TE12908 (147626) Throttle Arm - Rotary Carb
TE12909 (147627) Throttle Arm Retaining Nut - Rotary Carb
TE12912 (147628) Throttle Barrel Spring
TE15-08C (147608) Carburetor Assembly - Slide
TE15-10 (147609) Carburetor Retaining Bolt
TE15901 (147605) Idle Stop Screw - Slide Carb
TE15902A (147610) Carburetor Body - Slide Carb
TE15904 (147611) Dust Boot - Slide Carb
TE15905 (147612) Throttle Barrel - Slide Carb
TE15907 (147613) Low Speed Needle Valve - Slide Carb
TE1607A (147614) Connecting Rod
TE1816 (147615) Rear Ball Bearing
TE9005 (147522) Carburetor Ball Link
TE9011 (147524) High Speed Needle Valve
TE9012 (147525) O-Ring for High Speed Needle Valve
TE9013 (147526) High Speed Needle Valve Base
TE9014 (147527) High Speed Needle Valve Base Washers (2)
TE9015 (147528) Fuel Inlet Nipple
TE9016 (147523) Ball Link Retaining Screw
TE9018 (147521) Ball End
TS001 (147629) Pull-Start Backplate
TS002 (147630) Cushion Spring
TS003 (147631) String Spool
TS004 (147632) One-Way Shaft
TS005 (147633) One-Way Bearing
TS006 (147634) Pull-Start Backplate Screw Set (4)
TS011 (147635) Pull-Start String
TS012 (147636) String Tube
TS013 (147637) Pull-Start Rear Cover
TS014 (147539) Screw Set for Rear Cover (4)
TS016 (147638) Pull-Start Handle
TS017 (147639) Eddy Spring
TS020 (147640) String Tube Base
TS1A (147641) Pull-Start Front Parts
TS1B (147642) Pull-Start Rear Parts
TROUBLESHOOTING GUIDE AND WARRANTY
INFORMATION CAN BE FOUND ON THE BACK
OF THIS SHEET
EXPLODED VIEW DRAWING AND PARTS
LIST FOR .12 PRO REAR-EXHAUST ENGINES
(PT12R01, PT12R01S, PT12R01A &
PT12R02AS)
Numbers that start with "T" are SH Engines
manufacturer numbers. The six-digit numbers are
provided for easy ordering convenience though
your local Global Hobbies dealer.

PROBLEM CAUSE SOLUTION
1) Engine does not start A) Failed glow plug A) Replace glow plug with a new one
B) Glow Starter not charged and/or faulty B) Fully charge glow starter and/or replace
C) Idle mixture screw set too lean C) Reset idle mixture to factory setting
D) Old or contaminated fuel D) Replace with new fuel
E) Engine flooded with too much fuel E) Remove glow plug and expel fuel from cylinder
F) Air leak in fuel system and/or engine F) Replace fuel lines and/or tighten all engine bolts
2) Engine does not draw fuel A) Air leak in fuel system and/or engine A) Replace fuel lines and/or tighten all engine bolts
B) High speed needle valve fully closed B) Reset high speed needle valve to factory setting
C) Idle mixture screw set too lean C) Reset idle mixture to factory setting
D) Fuel lines kinked D) Check and straighten fuel lines
E) Defective fuel tank E) Replace fuel tank
3) Engine does not transition A) Failed and/or wrong type glow plug A) Replace with new recommended glow plug
B) Old and/or wrong type fuel B) Replace with new recommended fuel
C) High speed needle valve set too rich C) Reset high speed needle valve to leaner setting
D) Idle mixture set too lean D) Set idle mixture richer
E) Idle mixture set too rich E) Set idle mixture leaner
F) Air leak in fuel system and/or engine F) Replace fuel lines and/or tighten all engine bolts
4) Engine overheats A) Engine running too lean A) Richen high speed needle valve
B) Body too Restrictive B) Open larger vents in body to allow air to enter and exit
C) Wrong type of fuel used C) Use fuel recommended only for R/C cars
D) Engine not fully broken in D) Allow engine further break-in time
5) Engine vibrates excessively A) Engine and/or engine mounts loose A) Tighten all engine mounting bolts
6) Engine does not idle down A) Idle stop screw out of adjustment A) Adjust idle stop screw so carb barrel stays open 1mm
B) Air leak in fuel system and/or engine B) Check fuel lines, tank and engine bolts. Verify carb is
seated and tight
7) Pull-Start Slips A) One-way bearing saturated with fuel oil A) Remove one-way bearing and clean bearing and
starter shaft with rubbing alcohol
B) One-way bearing and/or starter shaft are worn B) Replace one-way bearing and/or starter shaft
C) Fuel used has too much oil content C) Use fuel with 10%-14% oil content
All SH engines returned for warranty service must be within the warranty terms as stated on the warranty card provided with your engine.
Do not return the engine to the place of purchase. They are not authorized or equipped to perform warranty work on SH products. When
requesting warranty service, please observe the following guidelines:
●Always send the complete engine including the carburetor. The engine must be removed from the model.
●Include a note detailing the problem or service you are requesting. Service cannot be provided without this information. Include your daytime phone
number in the event we need more details pertaining to the service requested.
●You may request an estimate of services at the time you return your engine for service. An omission of this request implies permission for Global
Services to service your engine at our discretion.
●Include a method of payment for any service charges. If not specified, the unit will be returned to you C.O.D.
●Send the engine to us by United Parcel Service, Federal Express or by Insured Mail. Postage is not refundable. Send to:
Global Services ●●
●●
●18480 Bandilier Circle ●●
●●
●Fountain Valley, CA 92708
Phone [phone] ●●
●●
●Fax [phone] ●●
●●
●Email: [e-mail]
RETURNING FOR WARRANTY SERVICE
This troubleshooting guide has been provided to help you diagnose and solve most problems that you may encounter with
your SH .12 Pro Rear-Exhaust engine. Most problems encountered can be solved by carefully following the problem-cause-solution
sections below. If you cannot solve the problem using this troubleshooting guide, please feel free to contact us at the address or
phone number listed at the bottom of this page.
TROUBLESHOOTING GUIDE