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Thank you for choosing the XTM Racing 457 Pro 6-Port Rear Exhaust
engine.  All XTM Racing engines are designed for high power output
and easy handling.  The 457 Pro 6-Port  Rear Exhaust engine features
a dual ball bearing-supported SG-style crankshaft, true ABC piston
and sleeve, two-needle slide carburetor, heat-dissipating cylinder
head, pull-start assembly and superb attention to detail and quality.
All XTM Racing 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.

XTM Racing 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 exhaust system.  Never touch the
engine or exhaust system while they are hot.

Model car engines duce 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 sheet in its entirety to familiarize
yourself with the features and operation of your new XTM Racing
457 Pro 6-Port Rear Exhaust engine.

Start by using the photo below to familiarize yourself with the major
components of your new engine.

1

CAUTION - PLEASE READ!!

Should you encounter any problems with your engine, we have

included a separate troubleshooting guide with these instructions
to help you solve them.

6-PORT REAR EXHAUST

ENGINE WITH

TWO-NEEDLE SLIDE

CARBURETOR, SG-STYLE

CRANKSHAFT AND

PULL-START

ENGINE SPECIFICATIONS

Displacement ..................................... 4.57cc
Bore: ................................................... 18.5mm
Stroke: ................................................ 17mm
Top RPM: ........................................... 33,000rpm
Power: ................................................ 3.8hp
Weight: ............................................... 425g

XTM RACING 457 PRO 6-PORT REAR EXHAUST ENGINE

Due to running manufacturing changes and improvements,

your engine may differ slightly from that shown.

Summary of Contents for 457 PRO

Page 1: ...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 c...

Page 2: ...ically and severe damage to the engine will result GLOW PLUG RECOMMENDATION The glow plug can make a big difference in how your engine performs We recommend using a medium or hot heat range glow plug intended specifically for performance engines like the XTM Racing 4 P N 146021 or the XTM Racing 3 P N 146020 during the break in process After the break in period you may want to use a different heat...

Page 3: ...out 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 ...

Page 4: ...l 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 r...

Page 5: ...ower O Ring for Carburetor TE9002 148362 Carburetor Barrel TE9003 148364 O Ring for Low Speed Needle Valve TE9007 148372 Low Speed Needle Valve TE9004A 148443 Dust Boot TE9018 148378 Ball Cup TE9005 148370 Ball Link TE9016 148376 Set Screw for Ball Link TS3A 1 148444 Pull Start Assembly TS316 148445 Pull Start Handle TROUBLESHOOTING GUIDE AND WARRANTY INFORMATION CAN BE FOUND ON THE BACK OF THIS S...

Page 6: ...ank 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 a...

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